10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_____________________________________________

Form 10-Q

_____________________________________________

QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2015

Commission File Number 001-08106

_____________________________________________

MasTec, Inc.

(Exact Name of Registrant as Specified in Its Charter)

Florida	65-0829355
(State or Other jurisdiction of	(I.R.S. Employer
Incorporation or Organization)	Identification No.)
800 S. Douglas Road, 12th Floor,
Coral Gables, FL	33134
(Address of Principal Executive Offices)	(Zip Code)

(305) 599-1800

(Registrant’s Telephone Number, Including Area Code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes þ    No ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes þ    No ¨

Indicate by check mark if the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer”, “accelerated filer”, and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	þ		Non-accelerated filer	¨
Accelerated filer	¨	(Do not check if a smaller reporting company)	Smaller reporting company	¨

    Indicate by check mark whether the registrant is shell company (as defined in Rule 12b-2 of the Act.)    Yes ¨   No   þ

As of October 29, 2015, MasTec, Inc. had 79,887,902 shares of common stock, $0.10 par value, outstanding.

MASTEC, INC

FORM 10-Q

QUARTER ENDED SEPTEMBER 30, 2015

TABLE OF CONTENTS

		Page
Part I. FINANCIAL INFORMATION		3
Item 1	Financial Statements	3
	Condensed Unaudited Consolidated Statements of Operations	3
	Condensed Unaudited Consolidated Statements of Comprehensive Income (Loss)	4
	Condensed Unaudited Consolidated Balance Sheets	5
	Condensed Unaudited Consolidated Statements of Cash Flows	6
	Notes to the Condensed Unaudited Consolidated Financial Statements	7
Item 2	Management’s Discussion and Analysis of Financial Condition and Results of Operations	32
Item 3	Quantitative and Qualitative Disclosures About Market Risk	45
Item 4	Controls and Procedures	46
Part II. OTHER INFORMATION		46
Item 1	Legal Proceedings	47
Item 1A	Risk Factors	47
Item 2	Unregistered Sales of Equity Securities and Use of Proceeds	48
Item 6	Exhibits	48
SIGNATURES		49

2

Explanatory Note

As more fully described in its Annual Report on Form 10-K for the fiscal year ended December 31, 2014 (the “2014 Form 10-K”), MasTec, Inc. (the “Company”) has restated its condensed unaudited consolidated financial statements for the three and nine month periods ended September 30, 2014. All financial information with respect to the 2014 periods presented in this report reflects the restated financial information. For a discussion of the restatement and adjustments made as a result of the restatement, see Note 2 - Independent Investigation of the Audit Committee and Related Restatements in the notes to the audited consolidated financial statements included in the 2014 Form 10-K, as well as Note 1 - Business, Basis of Presentation and Significant Accounting Policies in the notes to the condensed unaudited consolidated financial statements included in this report.

PART I.     FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

MASTEC, INC.

CONDENSED UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share amounts)

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2015			2014			2015			2014
				As Restated						As Restated
Revenue	$	1,111,010		$	1,315,488		$	3,180,906		$	3,380,538
Costs of revenue, excluding depreciation and amortization	972,711			1,122,861			2,805,072			2,914,901
Depreciation and amortization	42,196			41,747			128,048			111,996
General and administrative expenses	63,798			59,889			207,077			167,454
Interest expense, net	11,964			12,643			35,845			37,595
Other expense (income), net	6,702			(1,416		)	4,342			(5,424		)
Income from continuing operations before income taxes	$	13,639		$	79,764		$	522		$	154,016
Provision for income taxes	(6,197		)	(30,319		)	(3,288		)	(58,569		)
Net income (loss) from continuing operations	$	7,442		$	49,445		$	(2,766	)	$	95,447
Discontinued operations:
Net loss from discontinued operations	$	—		$	(320	)	$	—		$	(592	)
Net income (loss)	$	7,442		$	49,125		$	(2,766	)	$	94,855
Net (loss) income attributable to non-controlling interests	(176		)	139			(420		)	48
Net income (loss) attributable to MasTec, Inc.	$	7,618		$	48,986		$	(2,346	)	$	94,807
Earnings per share(See Note 2):
Basic earnings (loss) per share:
Continuing operations	$	0.10		$	0.60		$	(0.03	)	$	1.21
Discontinued operations	—			(0.00		)	—			(0.01		)
Total basic earnings (loss) per share	$	0.10		$	0.60		$	(0.03	)	$	1.20
Basic weighted average common shares outstanding	79,845			81,811			80,681			79,158
Diluted earnings (loss) per share:
Continuing operations	$	0.09		$	0.57		$	(0.03	)	$	1.11
Discontinued operations	$	—		$	(0.00	)	$	—		$	(0.01	)
Total diluted earnings (loss) per share	$	0.09		$	0.57		$	(0.03	)	$	1.10
Diluted weighted average common shares outstanding	80,448			85,824			80,681			86,416

The accompanying notes are an integral part of these condensed unaudited consolidated financial statements.

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MASTEC, INC.

CONDENSED UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(in thousands)

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2015			2014			2015			2014
				As Restated						As Restated
Net income (loss)	$	7,442		$	49,125		$	(2,766	)	$	94,855
Other comprehensive (loss) income (See Note 12):
Foreign currency translation adjustments, net of tax	(13,330		)	(12,951		)	(32,050		)	(10,611		)
Comprehensive (loss) income	$	(5,888	)	$	36,174		$	(34,816	)	$	84,244
Comprehensive (loss) income attributable to non-controlling interests	(176		)	139			(420		)	48
Comprehensive (loss) income attributable to MasTec, Inc.	$	(5,712	)	$	36,035		$	(34,396	)	$	84,196

The accompanying notes are an integral part of these condensed unaudited consolidated financial statements.

4

MASTEC, INC.

CONDENSED UNAUDITED CONSOLIDATED BALANCE SHEETS

(in thousands, except shares and per share amounts)

	September 30, 2015			December 31, 2014
Assets
Current assets:
Cash and cash equivalents	$	7,154		$	24,059
Accounts receivable, net of allowance	1,023,663			1,303,552
Inventories, net	90,512			112,804
Prepaid expenses and other current assets	116,985			91,336
Total current assets	$	1,238,314		$	1,531,751
Property and equipment, net	586,993			623,118
Goodwill	1,064,822			1,082,466
Other intangible assets, net	218,761			250,373
Other long-term assets	136,896			76,272
Total assets	$	3,245,786		$	3,563,980
Liabilities and equity
Current liabilities:
Current maturities of long-term debt	$	78,827		$	73,631
Accounts payable	376,836			485,347
Accrued salaries and wages	80,979			60,528
Other accrued expenses	81,363			89,343
Acquisition-related contingent consideration, current	11,441			49,798
Billings in excess of costs and earnings	123,623			155,674
Other current liabilities	34,341			66,527
Total current liabilities	$	787,410		$	980,848
Acquisition-related contingent consideration, net of current portion	83,593			103,515
Long-term debt	1,098,585			1,061,159
Long-term deferred tax liabilities, net	186,642			203,476
Other long-term liabilities	65,072			66,907
Total liabilities	$	2,221,302		$	2,415,905
Commitments and contingencies (See Note 15)
Equity
Preferred stock, $1.00 par value: authorized shares - 5,000,000; issued and outstanding shares – none	$	—		$	—
Common stock, $0.10 par value: authorized shares - 145,000,000; issued shares - 87,951,049 and 87,614,955 as of September 30, 2015 and December 31, 2014, respectively	8,795			8,762
Capital surplus	767,881			756,688
Retained earnings	455,441			457,788
Accumulated other comprehensive loss	(66,054		)	(34,004		)
Treasury stock, at cost: 8,094,004 and 2,876,311 shares as of September 30, 2015 and December 31, 2014, respectively	(145,573		)	(45,573		)
Total MasTec, Inc. shareholders’ equity	$	1,020,490		$	1,143,661
Non-controlling interests	$	3,994		$	4,414
Total equity	$	1,024,484		$	1,148,075
Total liabilities and equity	$	3,245,786		$	3,563,980

The accompanying notes are an integral part of these condensed unaudited consolidated financial statements.

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MASTEC, INC.

CONDENSED UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	For the Nine Months Ended September 30,
	2015			2014
				As Restated
Cash flows from operating activities:
Net (loss) income	$	(2,766	)	$	94,855
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	128,048			111,996
Non-cash interest expense	2,036			6,052
Non-cash stock-based compensation expense	9,486			11,584
Excess tax benefit from stock-based compensation	(56		)	(3,494		)
(Benefit from) provision for deferred income taxes	(9,076		)	4,294
Other non-cash items	1,783			1,136
Gains on sales of assets	(2,619		)	(4,068		)
Non-cash change in estimated fair value of acquisition-related contingent consideration	(7,980		)	—
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	252,333			(126,950		)
Inventories	22,406			(27,553		)
Other assets, current and long-term portion	(13,915		)	5,202
Accounts payable and accrued expenses	(76,747		)	15,419
Billings in excess of costs and earnings	(31,168		)	2,896
Book overdrafts	(7,830		)	(10,399		)
Other liabilities, current and long-term portion	(3,333		)	49
Net cash provided by operating activities	$	260,602		$	81,019
Cash flows used in investing activities:
Cash paid for acquisitions, net of cash acquired	(148		)	(162,901		)
Capital expenditures	(70,766		)	(90,962		)
Proceeds from sale of property and equipment	9,763			12,204
Payments for other investments, net	(109,299		)	(1,046		)
Net cash used in investing activities	$	(170,450	)	$	(242,705	)
Cash flows (used in) provided by financing activities:
Proceeds from credit facilities	1,329,610			1,319,623
Repayments of credit facilities	(1,240,122		)	(955,151		)
Repayment of senior convertible notes	—			(105,325		)
Repayments of other borrowings	(10,568		)	(15,827		)
Payments of capital lease obligations	(40,687		)	(38,358		)
Repurchase of common stock	(100,000		)	—
Proceeds from stock-based awards, net of tax withholdings	1,743			318
Excess tax benefit from stock-based compensation	56			3,494
Payments of acquisition-related contingent consideration	(44,757		)	(60,341		)
Payments of financing costs	(2,435		)	(1,455		)
Net cash (used in) provided by financing activities	$	(107,160	)	$	146,978
Effect of currency translation on cash	103			(1,152		)
Net decrease in cash and cash equivalents	$	(16,905	)	$	(15,860	)
Cash and cash equivalents - beginning of period	$	24,059		$	22,927
Cash and cash equivalents - end of period	$	7,154		$	7,067

Supplemental cash flow information:
Interest paid	$	41,014	$	35,106
Income taxes paid, net of refunds	$	5,841	$	46,423
Supplemental disclosure of non-cash information:
Equipment acquired under capital lease	$	18,030	$	55,488
Equipment acquired under financing arrangements	$	7,949	$	6,851
Acquisition-related contingent consideration, new business combinations	—		$	33,612
Premium shares, conversion of convertible notes	—		$	114,785

The accompanying notes are an integral part of these condensed unaudited consolidated financial statements.

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MASTEC, INC.

NOTES TO CONDENSED UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

Note 1 – Business, Basis of Presentation and Significant Accounting Policies

Nature of the Business

MasTec, Inc. (collectively with its subsidiaries, “MasTec” or the “Company”) is a leading infrastructure construction company operating mainly throughout North America across a range of industries. The Company’s primary activities include the engineering, building, installation, maintenance and upgrade of communications, energy and utility infrastructure, such as: wireless, wireline/fiber and satellite communications; petroleum and natural gas pipeline infrastructure; electrical utility transmission and distribution; power generation; and industrial infrastructure. MasTec’s customers are primarily in these industries. MasTec reports its results under five reportable segments: (1) Communications; (2) Oil and Gas; (3) Electrical Transmission; (4) Power Generation and Industrial; and (5) Other.

Basis of Presentation

The accompanying condensed unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions for Form 10-Q and Rule 10-01 of Regulation S-X. Pursuant to these rules and regulations, certain information and footnote disclosures normally included in the annual audited consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The accompanying condensed consolidated balance sheet as of December 31, 2014 is derived from the Company’s audited financial statements as of that date. Because certain information and footnote disclosures have been condensed or omitted, these condensed unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto as of and for the year ended December 31, 2014 contained in the 2014 Form 10-K. In management’s opinion, all normal and recurring adjustments considered necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented have been included. Certain prior year amounts have been reclassified to conform to the current period presentation. Interim period operating results do not necessarily indicate the results that may be expected for any other interim period or for the full fiscal year. The Company believes that the disclosures made in these condensed unaudited consolidated financial statements are adequate to make the information not misleading. In these condensed unaudited consolidated financial statements, “$” means U.S. dollars unless otherwise noted.

Principles of Consolidation

The accompanying condensed unaudited consolidated financial statements include MasTec, Inc. and its subsidiaries and include the accounts of all majority owned subsidiaries over which the Company exercises control and, when applicable, entities in which the Company has a controlling financial interest. Other parties’ interests in companies for which MasTec exercises control and has a controlling financial interest are reported as non-controlling interests within equity. Net income or loss attributable to non-controlling interests is reported as a separate line item below net income or loss. The Company’s investments in entities in which the Company does not have a controlling interest, but for which it has the ability to exert significant influence, are accounted for using the equity method of accounting. Equity method investments are recorded as other long-term assets in the condensed unaudited consolidated balance sheets. Income or loss from these investments is recorded within other income or expense in the condensed unaudited consolidated statements of operations. The cost method is used for investments in entities in which the Company does not have the ability to exert significant influence. All significant intercompany balances and transactions have been eliminated in consolidation. The assets and liabilities of foreign subsidiaries with a functional currency other than the U.S. dollar are translated into U.S. dollars at period-end exchange rates, with resulting translation gains or losses accumulated within other comprehensive income or loss. Revenue and expenses are translated into U.S. dollars at average rates of exchange during the applicable period. Substantially all of the Company’s foreign operations use the local currency as the functional currency. Gains or losses resulting from transactions executed in a foreign currency are included in other income or expense, net. The Company does not currently have subsidiaries that operate in highly inflationary environments. The results of operations and financial position of any discontinued operations are aggregated and presented separately from the Company’s continuing operations in the condensed unaudited consolidated financial statements for all periods presented.

Restatement of Previously Reported Condensed Unaudited Consolidated Financial Statements

As disclosed in the 2014 Form 10-K, the Company restated its condensed unaudited consolidated financial statements for the three and nine month periods ended September 30, 2014 and presented these restated results in Note 2 - Independent Investigation of the Audit Committee and Related Restatements of the 2014 Form 10-K. The condensed unaudited consolidated financial statements, along with the related notes thereto as of and for the three and nine month periods ended September 30, 2014 reflect these restatements. The restatement adjustments had the following effects on the 2014 periods:

• An increase in revenue of $5.9 million and $2.4 million for the three and nine month periods ended September 30, 2014, respectively, associated with changes in cost-to-complete estimates on projects accounted for under the percentage-of-completion method, primarily in the Electrical Transmission segment;

• Immaterial adjustments in costs of revenues, excluding depreciation and amortization, for the three and nine month periods ended September 30, 2014;

• An increase in income tax expense of $2.3 million and $0.9 million for the three and nine month periods ended September 30, 2014, respectively, representing the tax effects of the adjustments;

• An increase in net income from continuing operations of $3.7 million and $1.5 million, respectively, for the three and nine month periods ended September 30, 2014; and

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• An increase in basic earnings per share from continuing operations of $0.04, an increase in total basic earnings per share of $0.05, and an increase in diluted earnings per share of $0.04 for the three month period ended September 30, 2014, respectively. Basic, total basic and diluted earnings per share each increased by $0.02 for the nine month period ended September 30, 2014.

In addition, there were the following balance sheet effects:

• a reclassification adjustment associated with cost-to-complete estimates that decreased costs and earnings in excess of billings and other current liabilities by $5.3 million, partially offset by an increase in costs and earnings in excess of billings of $1.1 million from other cost-to-complete estimate changes, primarily in the Electrical Transmission segment, for a net decrease in cost in excess of billings and earnings of $4.2 million as of September 30, 2014;

• a decrease in billings in excess of costs and earnings of $1.3 million; and

• an increase in current taxes payable of $0.9 million, as well as other immaterial adjustments within various segments.

Investments in Affiliates and Other Entities

In the ordinary course of business, the Company enters into various investment arrangements, which may include equity or other interests in business entities, including contractual joint ventures or other forms of equity participation. These investment arrangements may include financing arrangements, such as the extension of loans. See Note 3 - Acquisitions and Note 5 - Fair Value of Financial Instruments for discussion pertaining to certain of the Company’s cost and equity method investments and other investment arrangements. In connection with certain of these investment arrangements, the Company provides infrastructure construction services to or through its equity investees and/or contractual joint ventures. Management determines whether such investment arrangements involve a variable interest entity (“VIE”) based on the characteristics of the particular entity. If an entity is determined to be a VIE, then management determines if the Company is the primary beneficiary of the entity and whether or not consolidation of the VIE within the Company's financial statements is required. The primary beneficiary consolidating the VIE must normally have both (i) the power to direct the primary activities of the VIE and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE, which, in either case, could be significant to the VIE. If management determines that the Company is the primary beneficiary of a VIE, then the VIE would be consolidated, and the other party’s equity interest in the VIE would be accounted for as a non-controlling interest. As of September 30, 2015, the Company determined that certain of its investment arrangements were VIEs, but that it was not the primary beneficiary. In arrangements in which the Company has an undivided interest in the assets, liabilities, revenues and profits or losses of an unincorporated entity, such amounts are consolidated on a basis proportional to the Company’s ownership interest in the unincorporated entity.

Management Estimates

The preparation of financial statements in conformity with U.S. GAAP requires the use of estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Key estimates include: the recognition of revenue and project profit or loss (which the Company defines as project revenue, less project costs of revenue, including depreciation), in particular, on long-term construction contracts, or other projects accounted for under the percentage-of-completion method, for which the recorded amounts require estimates of costs to complete projects, ultimate project profit and the amount of contract price adjustments that are probable; allowances for doubtful accounts; estimated fair values of goodwill and intangible assets and liabilities, acquisition-related contingent consideration and investments in cost and equity method investees; asset lives used in computing depreciation and amortization; accrued self-insured claims; share-based compensation; accounting for income taxes; and the estimated impact of contingencies and ongoing litigation. While management believes that such estimates are fair when considered in conjunction with its consolidated financial position and results of operations taken as a whole, actual results could differ from those estimates and such differences could be material to the condensed unaudited consolidated financial statements.

Significant Accounting Policies

Revenue Recognition

Revenue is derived from projects performed under master and other service agreements as well as from fixed price contracts for specific projects or jobs requiring the construction and installation of an entire infrastructure system or specified units within an entire infrastructure system. The Company frequently provides maintenance, installation and repair work under unit price or fixed price master service or other service agreements that are renewed on a periodic basis. Revenue and related costs for master and other service agreements billed on a time and materials basis are recognized as the services are rendered. Revenue derived from projects performed under master service and other service agreements totaled 44% and 43% of revenue for the three month periods ended September 30, 2015 and 2014, respectively, and totaled 47% and 49% of revenue, respectively, for the nine month periods ended September 30, 2015 and 2014. The Company also performs services under master and other service agreements on a fixed fee basis, under which MasTec furnishes specified units of service for a fixed price per unit of service and revenue is recognized as the services are rendered. Revenue from fixed price contracts provides for a fixed amount of revenue for the entire project, subject to certain additions for changed scope or specifications. Revenue from these contracts, as well as for certain projects pursuant to master and other service agreements, is recognized using the percentage-of-completion method, under which the percentage of revenue to be recognized for a given project is measured by the percentage of costs incurred to date on the contract to the total estimated costs for the contract. Such contracts provide that the customer accept completion of progress to date and compensate the Company for services rendered, which may be measured in terms of costs incurred, units installed, hours expended or some other measure of progress. Contract costs include all direct materials, labor and subcontracted costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and the operational costs of capital equipment (excluding depreciation). Much of the materials associated with the Company’s work are customer-furnished and are therefore not included in contract revenue and costs.

The estimation process for revenue recognized under the percentage-of-completion method is based on the professional knowledge and experience of the Company’s engineers, project managers and financial professionals. Management reviews estimates of contract revenue and costs on an ongoing basis. Changes in job performance, job conditions and final contract settlements are factors that influence management’s assessment of total

8

contract value and total estimated costs to complete those contracts and, therefore, the Company’s profit recognition. Changes in these factors may result in revisions to costs and income, and their effects are recognized in the period in which the revisions are determined, which could materially affect the Company’s results of operations in the period in which such changes are recognized. Excluding the effects of project losses of $21.4 million on a Canadian wind project and $8.3 million on a non-controlled proportionately consolidated Canadian joint venture for the nine month period ended September 30, 2015, project profit was affected by less than 5% for both the nine month periods ended September 30, 2015 and 2014 as a result of changes in contract estimates included in projects that were in process as of December 31, 2014 and 2013, respectively. Provisions for losses on uncompleted contracts are made in the period in which such losses are determined to be probable and the amount can be reasonably estimated. The majority of fixed price contracts are generally completed within one year.

The Company may incur costs subject to change orders, whether approved or unapproved by the customer, and/or claims related to certain contracts. Management determines the probability that such costs will be recovered based upon engineering studies and legal opinions, past practices with the customer, specific discussions, correspondence or preliminary negotiations with the customer. The Company treats project costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, or defers costs and/or recognizes revenue up to the amount of the related cost if it is probable that the contract price will be adjusted and can be reliably estimated. As of September 30, 2015 and December 31, 2014, the Company had approximately $28 million and $87 million, respectively, of change orders and/or claims that had been included as contract price adjustments on certain contracts that were in the process of being resolved in the normal course of business, including through negotiation, arbitration and other proceedings. These contract price adjustments, which are included within costs and earnings in excess of billings, or billed accounts receivable as appropriate, represent management’s best estimate of contract revenue that has been or will be earned and that management believes is probable of collection. As of both September 30, 2015 and December 31, 2014, outstanding change orders and/or claims were derived from contracts in the Electrical Transmission and Oil and Gas segments. The Company actively engages in substantive meetings with these customers to complete the final approval process and expects these processes to be completed within one year. The amounts ultimately realized upon final acceptance by its customers could be higher or lower than such estimated amounts.

Billings in excess of costs and estimated earnings on uncompleted contracts are classified as current liabilities. Costs and estimated earnings in excess of billings, or work in process, is classified within current assets for the majority of the Company’s projects. Work in process on contracts is based on work performed but not yet billed to customers as per individual contract terms.

Except for adoption of the accounting pronouncement discussed below, there have been no material changes to the significant accounting policies set forth in the 2014 Form 10-K.

New Accounting Pronouncements

Accounting Standards Not Yet Adopted

In September 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments (“ASU 2015-16”). ASU 2015-16 eliminates the requirement to retrospectively account for adjustments to provisional amounts within the measurement period recognized at the acquisition date in a business combination. ASU 2015-16 requires that these adjustments be recognized in the reporting period in which the adjustment amounts are determined and be calculated as if the accounting had been completed as of the acquisition date. ASU 2015-16 is effective prospectively for fiscal years, and for interim periods within those years, beginning after December 15, 2015. Early application is permitted. The Company is currently evaluating the impact of this ASU on its consolidated financial statements.

In July 2015, the FASB issued ASU 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory (“ASU 2015-11”). ASU 2015-11 requires that inventory measured using any method other than last-in, first out (“LIFO”) or the retail inventory method to be subsequently measured at the lower of cost or net realizable value, rather than at the lower of cost or market value. Under this ASU, subsequent measurement of inventory using the LIFO and retail inventory method is unchanged. ASU 2015-11 is effective prospectively for fiscal years, and for interim periods within those years, beginning after December 15, 2016. Early application is permitted. The Company is currently evaluating the impact of this ASU on its consolidated financial statements.

In April 2015, the FASB issued ASU 2015-05, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. ASU 2015-05 provides guidance for determining whether a cloud computing arrangement includes a software license and requires that all software licenses within the scope of Subtopic 350-40 be accounted for in a manner consistent with other licenses of intangible assets. ASU 2015-05 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early application is permitted. Retrospective application is permitted for all relevant prior periods. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements.

In April 2015, the FASB issued ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03”). ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented as a direct deduction from the carrying amount of the debt, consistent with debt discounts. ASU 2015-03 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early application is permitted. Retrospective application is required for all relevant prior periods. In August 2015, the FASB issued ASU 2015-15, Interest - Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements - Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting (SEC Update) (“ASU 2015-15”). ASU 2015-15 clarifies that, subsequent to adoption of ASU 2015-03, an entity has the option to defer and present debt issuance costs from line-of-credit arrangements as an asset and subsequently amortize the costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. The Company does not expect the adoption of ASU 2015-03 or ASU 2015-15 to have a material impact on its consolidated financial statements.

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In February 2015, the FASB issued ASU 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis (“ASU 2015-02”). ASU 2015-02 changes the evaluation that a reporting entity must perform to determine whether it should consolidate certain types of legal entities, reduces the number of consolidation models and places emphasis on risk of loss when determining a controlling financial interest. Under ASU 2015-02, all entities are within the scope of Accounting Standards Codification (“ASC”) Subtopic 810, Consolidation, including limited partnerships and similar legal entities, unless a scope exception applies. The presumption that a general partner controls a limited partnership has been eliminated. In addition, fees paid to decision makers that meet certain conditions no longer cause consolidation of VIEs in certain instances. The amendments place more emphasis on variable interests other than fee arrangements and reduce the extent to which related party arrangements cause an entity to be considered a primary beneficiary. ASU 2015-02 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early application is permitted. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements.

In January 2015, the FASB issued ASU 2015-01, Income Statement - Extraordinary and Unusual Items (Subtopic 225-20): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items (“ASU 2015-01”). ASU 2015-01 eliminates the presentation and disclosure requirements of extraordinary items because it was unclear when an item should be considered both unusual and infrequent and was extremely rare in practice. ASU 2015-01 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. The Company does not expect the adoption of this ASU to have an impact on its consolidated financial statements.

In November 2014, the FASB issued ASU 2014-16, Derivatives and Hedging (Topic 815): Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share is More Akin to Debt or to Equity (a consensus of the FASB Emerging Issues Task Force) (“ASU 2014-16”). The amendments in ASU 2014-16 do not change the current criteria in U.S. GAAP for determining when separation of certain embedded derivative features in a hybrid financial instrument is required. Rather, ASU 2014-16 clarifies how current U.S. GAAP should be interpreted in evaluating the economic characteristics and risks of a host contract in a hybrid financial instrument that is issued in the form of a share. ASU 2014-16 is effective for existing hybrid financial instruments issued in the form of a share on a modified retrospective basis for fiscal years, and for interim periods within those years, beginning after December 15, 2015. Retrospective application is permitted for all relevant prior periods. The Company does not expect the adoption of this ASU to have an impact on its consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”). The core principle of this ASU is that a company will recognize revenue when it transfers goods or services to customers in an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under current guidance and will be required to disclose information about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including disclosure of assumptions and estimates where significant judgment has been applied. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which delayed the effective date of ASU 2014-09 by one year. ASU 2014-09, as amended, is effective using either the retrospective or cumulative effect transition method for fiscal years, and for interim periods within those years, beginning after December 15, 2017. Early application is permitted, but not before fiscal years, and interim periods within those years, beginning after December 15, 2016. The Company is currently determining which transition method will be used and evaluating the potential impact of this ASU on its consolidated financial statements.

Recently Adopted Accounting Pronouncements

In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity (“ASU 2014-08”). ASU 2014-08 changes the requirements for reporting discontinued operations and requires additional disclosures about discontinued operations. Only disposals of components of an entity representing a strategic shift that has, or will have, a major effect on an entity’s operations and financial results should be reported as discontinued operations under ASU 2014-08. Examples include a disposal of a major geographical area, a major line of business, or a major equity method investment. ASU 2014-08 also requires expanded disclosure about discontinued operations and requires disclosure about individually significant dispositions that do not qualify as a discontinued operation. ASU 2014-08 is effective prospectively for fiscal years, and for interim periods within those years, beginning after December 15, 2014. The Company adopted ASU 2014-08 as of January 1, 2015. The adoption of this ASU did not have an impact on the Company’s condensed unaudited consolidated financial statements, but could impact whether future disposals of operations would qualify as discontinued operations.

Note 2 – Earnings Per Share

Basic earnings or loss per share is computed by dividing net income or loss available to MasTec’s common shareholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share is computed by dividing net income available to MasTec’s common shareholders by the number of fully diluted shares, which includes the effect of dilutive potential issuances of common shares as determined using income from continuing operations, including the potential issuance of common shares upon the exercise, conversion or vesting of outstanding stock options and unvested restricted shares, as calculated under the treasury stock method, as well as shares associated with the Company’s convertible debt securities, which matured and were converted in 2014. If the Company reports a loss, rather than income, from continuing operations, the computation of diluted loss per share excludes dilutive common stock equivalents as their effect would be anti-dilutive. For the nine month period ended September 30, 2015, the Company reported a net loss from continuing operations, and 648,379 dilutive common shares were excluded from the calculation of diluted net loss per share for the related period. Therefore, diluted and basic earnings per share were the same in this period.

There were no anti-dilutive common stock equivalents for the three and nine month periods ended September 30, 2015, except for those excluded from the calculation of diluted net loss per share as discussed above. For the three and nine month periods ended September 30, 2014, there were 304,486 and 223,422 weighted average anti-dilutive common stock equivalents excluded from the calculation of diluted earnings per share because their effect would have been anti-dilutive.

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The following table provides details underlying the Company’s earnings per share calculations for the periods indicated (in thousands):

	For the Three Months Ended September 30,					For the Nine Months Ended September 30,
	2015		2014			2015			2014
			As Restated						As Restated
Net income (loss) attributable to MasTec:
Net income (loss), continuing operations - basic (a)	$	7,618	$	49,306		$	(2,346	)	$	95,399
Interest expense, net of tax, convertible notes	—		20			—			166
Net income (loss), continuing operations - diluted	$	7,618	$	49,326		$	(2,346	)	$	95,565
Net loss from discontinued operations - basic and diluted (a)	—		(320		)	—			(592		)
Net income (loss) attributable to MasTec - diluted	$	7,618	$	49,006		$	(2,346	)	$	94,973
Weighted average shares outstanding:
Weighted average shares outstanding - basic	79,845		81,811			80,681			79,158
Dilutive common stock equivalents	603		814			—			798
Dilutive shares, convertible notes	—		3,199			—			6,460
Weighted average shares outstanding - diluted	80,448		85,824			80,681			86,416

(a) Calculated as total net income (loss) less amounts attributable to non-controlling interests.

Convertible Notes - Diluted Share Impact

In June 2014, $115 million aggregate principal amount of 4.0% senior convertible notes (the “4.0% Convertible Notes”) matured, at which time the holders elected to convert the notes. Upon conversion, the Company paid $105 million in cash and issued 4.2 million shares of common stock in respect thereof. The 4.0% Convertible Notes were composed of $105 million of 4.0% Convertible Notes issued in 2011 (the “2011 4.0% Notes”) and approximately $10 million of 4.0% Convertible Notes issued in 2009 (the “2009 4.0% Notes”). Additionally, in December 2014, $100 million aggregate principal amount of 4.25% senior convertible notes (the “4.25% Convertible Notes”) matured and were converted, and, upon conversion, the Company paid $97 million in cash and issued 2.4 million shares of common stock in respect of such notes. The 4.25% Convertible Notes were composed of $97 million of 4.25% Convertible Notes issued in 2011 (the “2011 4.25% Notes”) and $3 million of 4.25% Convertible Notes issued in 2009 (the “2009 4.25% Notes”). The 2009 4.0% Notes and the 2009 4.25% Notes are collectively referred to as the “2009 Convertible Notes,” and the 2011 4.0% Notes and the 2011 4.25% Notes are collectively referred to as the “2011 Convertible Notes.”

Until their maturity in 2014, dilutive shares associated with the 2009 Convertible Notes were attributable to the underlying principal amounts and were reflected in the calculation of weighted average diluted earnings per share for the corresponding periods by application of the “if-converted” method, whereas dilutive shares associated with the 2011 Convertible Notes were derived from the premium value of the notes in excess of their principal amounts, as calculated using the treasury stock method. These shares were referred to as the “premium shares.” The 4.25% Convertible Notes were convertible at $15.48 per share and the 4.0% Convertible Notes were convertible at $15.76 per share. The calculations underlying the number of premium shares included in the Company’s diluted share count for the periods indicated were as follows (in thousands, except per share amounts):

	2011 4.25% Notes
Premium Share Information:	For the Three Months Ended September 30, 2014		For the Nine Months Ended September 30, 2014
Number of conversion shares, principal amount	6,268		6,268
Per share price, actual average	$	29.73	$	35.06
Premium value	$	89,341	$	122,748
Premium shares	3,005		3,501

In addition to the premium shares described above, there were 2.4 million equivalent premium shares included in the Company's dilutive share calculation for the nine month period ended September 30, 2014 related to the 2011 4.0% Notes, as calculated based on the average price per share of the Company's common stock from the beginning of the period through June 15, 2014, the date of maturity.

Note 3 – Acquisitions

The Company acquired several businesses during 2014, as discussed below and in Note 4 - Acquisitions in the notes to the Company’s audited consolidated financial statements included in its 2014 Form 10-K. As of September 30, 2015, determination of the fair values of the net assets acquired, including the estimated values of contingent earn-out obligations and the estimated useful lives of acquired assets for the WesTower acquisition, as discussed below, were provisional and remained preliminary. Management continues to assess the valuation of these items and any ultimate purchase price adjustments that may result based on the final net assets and net working capital, as prescribed in the purchase agreement.During the measurement period, as defined under U.S. GAAP, the Company will revise its preliminary estimates of the fair values of net assets acquired if new information is obtained about the facts and circumstances existing as of the date of acquisition or for purchase price adjustments. Such adjustments may result in the

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recognition of, or adjust the fair values of, acquired assets and assumed liabilities, and are presented as if the adjustments had been taken into account as of the date of acquisition, which would result in the revision of comparative prior period financial information. All changes that do not qualify as measurement period adjustments are included in current period results. As discussed under “New Accounting Pronouncements” in Note 1 - Business, Basis of Presentation and Significant Accounting Policies, ASU 2015-16 eliminates the requirement to retrospectively account for measurement period adjustments. The Company is currently evaluating the expected timing of application, and related impact of, adoption of this ASU on potential future measurement period adjustments.

2014 Acquisitions

WesTower

Effective October 1, 2014, MasTec acquired all of the issued and outstanding equity interests of WesTower Communications Inc. (“WesTower”). WesTower is a telecommunications services firm focusing on construction and maintenance of communications infrastructure related to wireless networks throughout the United States. WesTower, which provides services to a number of major wireless carriers throughout the Eastern, Central and Western United States, is expected to expand the Company’s geographical presence, market penetration and skilled employee base within its existing wireless operations. WesTower is reported within the Company’s Communications segment.

The following table summarizes the preliminary estimated fair values of consideration paid and identifiable assets acquired and liabilities assumed as of the date of acquisition (in millions):

Acquisition consideration:	October 1, 2014
Cash	$	198.0
Identifiable assets acquired and liabilities assumed:
Accounts receivable	$	180.6
Other current assets, including $18.0 million of cash acquired	50.3
Property, equipment and other long-term assets, including deferred tax asset	18.0
Finite-lived intangible assets	42.6
Billings in excess of costs and earnings	(33.3		)
Other current liabilities, including current portion of capital lease obligations	(89.8		)
Long-term liabilities, including capital lease obligations	(21.1		)
Total identifiable net assets	$	147.3
Goodwill	$	50.7
Total net assets acquired, including goodwill	$	198.0

The fair values and weighted average useful lives of WesTower’s acquired finite-lived intangible assets as of the date of acquisition were assigned as follows:

	Fair Value (in millions)		Weighted Average Useful Life (in years)
Finite-lived intangible assets:
Backlog	$	4.7	5
Trade name	1.1		4
Non-compete agreements	0.3		4
Customer relationships	36.5		18
Total acquired finite-lived intangible assets	$	42.6	16

Finite-lived intangible assets are amortized in a manner consistent with the pattern in which the related benefits are expected to be consumed. Goodwill arising from the acquisition represents the estimated value of WesTower’s geographic presence in key high growth markets, its assembled workforce and synergies expected to be achieved from the combined operations of WesTower and MasTec. The goodwill balance is not tax deductible.

In connection with the WesTower acquisition, the Company incurred acquisition integration costs of approximately $1.2 million and $17.8 million for the three and nine month periods ended September 30, 2015, respectively, which were included within general and administrative expenses within the condensed unaudited consolidated statements of operations. These acquisition integration costs consisted primarily of employee termination costs, including employee compensation relating to the elimination of certain positions, which were determined to be redundant, and other integration-type costs, including facility consolidation expenses, system migration expenses and training costs. As of September 30, 2015, the Company had substantially completed the integration of WesTower. As of September 30, 2015 and December 31, 2014, $1.7 million and $3.5 million, respectively, was included within current liabilities relating to acquisition integration costs. Liabilities assumed in connection with the WesTower acquisition also include the estimated value of certain off-market contracts, which are recognized in revenue over the terms of the related contracts.

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Pacer

Effective June 1, 2014, MasTec acquired all of the issued and outstanding equity interests of Pacer Construction Holdings Corporation and its affiliated operating companies (collectively, “Pacer”). Pacer is a western Canadian civil construction services company, headquartered in Calgary, Alberta, Canada.  Pacer’s services include infrastructure construction primarily in support of oil and gas production, processing, mining and transportation. Pacer, a leading contractor in the Canadian oil sands market, is expected to enhance MasTec’s ability to develop energy infrastructure in western Canada and take advantage of associated opportunities in North America over the coming years. Pacer is primarily reported within the Company’s Oil and Gas segment.

The following table summarizes the estimated fair values of consideration paid and identifiable assets acquired and liabilities assumed, as adjusted, as of the date of acquisition (in millions):

Acquisition consideration:	June 1, 2014
Cash	$	126.5
Fair value of contingent consideration (earn-out liability)	24.3
Total consideration transferred	$	150.8
Identifiable assets acquired and liabilities assumed:
Current assets, including $3.4 million of cash acquired	$	114.0
Property and equipment	81.2
Pre-qualifications	38.7
Finite-lived intangible assets	19.4
Current liabilities, including current portion of capital lease obligations and long-term debt	(71.8		)
Net equity method investment obligations	(31.0		)
Long-term debt, including capital lease obligations	(69.6		)
Deferred income taxes	(30.5		)
Total identifiable net assets	$	50.4
Goodwill	$	100.4
Total net assets acquired, including goodwill	$	150.8

The values of certain of the assets acquired and liabilities assumed include the proportionate values of Pacer’s undivided interest in an unincorporated contractual joint venture, which is involved in a civil construction project and is accounted for on a proportional basis. Pacer’s undivided interest in this contractual joint venture automatically terminates upon completion of the project, which is not controlled by Pacer and is managed by a third party. This project, which was approximately 65% complete as of September 30, 2015, incurred losses for the three and nine month periods ended September 30, 2015 due to delayed receipt of a key material. Pacer’s proportionate share of these losses totaling $2.8 million and $8.3 million for the three and nine month periods ended September 30, 2015, respectively, are included in the Other segment. Pacer has minimal direct work involvement in this project. For the three and nine month periods ended September 30, 2015, revenue recognized by Pacer in connection with work performed for this contractual joint venture totaled $0.3 million and $1.8 million, respectively. As of September 30, 2015 and December 31, 2014, receivables from this contractual joint venture, including acquired receivables, totaled $1.1 million and $1.8 million, respectively. Performance guarantees associated with this contractual joint venture as of both September 30, 2015 and December 31, 2014 totaled Canadian $132.1 million (or approximately $99.2 million and $113.6 million, respectively), based on the full contract value of the project, for which Pacer is obligated on a joint and several basis with its other joint venture partner. In addition, from time to time, the Company may provide financing to this contractual joint venture. For the nine month period ended September 30, 2015, Pacer provided $8.2 million of financing to this contractual joint venture under financing arrangements. As of both September 30, 2015 and December 31, 2014, there were no additional amounts committed by Pacer to this contractual joint venture under such financing arrangements.

The equity method investment obligations identified in the table above represent investments in entities that provide civil construction services. As a result of the ongoing review of the acquired net assets of Pacer, the Company determined that the initial fair value assigned to these investments was in excess of their fair value and that it would cease participation in the operations of these equity method investments in 2015 upon completion of the existing projects. Subsequent to the acquisition date, the Company recorded a $49 million reduction to the acquisition date value of Pacer’s equity method investments to reflect their expected fair values as determined based on their expected net cash outflows, including the wind-down of its investments. For the three and nine month periods ended September 30, 2015, revenue recognized by the Company on behalf of these entities totaled $1.6 million and $3.1 million, respectively, of which $1.6 million was outstanding as of September 30, 2015. There are performance guarantees associated with these entities of a gross amount of approximately $30.7 million and $61.2 million as of September 30, 2015 and December 31, 2014, respectively, based on the full contract value of certain projects, for which Pacer is obligated on a joint and several basis with the other shareholders. As of September 30, 2015, all construction projects associated with these equity method investees were substantially complete. As of September 30, 2015 and December 31, 2014, excluding the receivership arrangements discussed below, there were approximately $2.2 million and $3.0 million, respectively, of other financial guarantees associated with these investments, for which Pacer is obligated on a joint and several basis, the durations of which correspond to those of the guaranteed transactions or borrowings. The Company believes these obligations and guarantees represent variable interests; however, Pacer does not have the power to control the primary activities of, nor is it the primary beneficiary of, these investments. In addition, from time to time, the Company may provide financing to its equity method investees. Pacer provided $10.2 million of such financing to its equity investees during the nine month period ended September 30, 2015, $8.6 million of which was reflected within Pacer’s net equity method investment obligations as of the date of acquisition.

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As of both September 30, 2015 and December 31, 2014, there were no additional amounts committed by Pacer to these entities under such financing arrangements.

In March 2015, as part of the initiative to wind down operations of one of its equity method investees, Pacer became the secured creditor thereof by purchasing the outstanding revolving credit facility of this investee for approximately $20.8 million in order to satisfy its obligations pursuant to a financial guarantee to the investee’s lender. This payment is included within Pacer’s net equity method investment obligations as of the date of acquisition in the table above, and as of December 31, 2014, approximately $22.6 million was included within other current liabilities in the Company’s consolidated balance sheet related to this financial guarantee. Subsequent to Pacer’s purchase of the outstanding credit facility, a receivership order was granted to assist with the orderly wind-down of the investee’s operations. As part of the receivership proceedings, Pacer committed to provide the receiver financing of up to Canadian $78.0 million (or approximately $58.6 million as of September 30, 2015), and through September 30, 2015, approximately $38.3 million of this financing commitment had been paid. During the third quarter of 2015, the receiver repaid the Company approximately $12.8 million of the $38.3 million advanced to receiver, and the remaining balance of $23.1 million, based on currency exchange rates as of September 30, 2015, was recorded within prepaid expenses and other current assets in the condensed unaudited consolidated balance sheet. Pacer does not expect to advance additional amounts to the receiver, and, based on operational estimates from the receiver, the Company believes Pacer will be repaid the remaining amounts advanced under the receivership financing commitment within the next twelve months, with a substantial portion expected to be collected in the fourth quarter of 2015. Additionally, in September 2015, a separate equity method investee of Pacer entered into a receivership arrangement to facilitate the wind-down of its operations. As of September 30, 2015, Pacer expected to receive the remaining net assets related to this investee, which total less than $1.0 million, within the next twelve months.

Subsequent to the acquisition date, in connection with the ongoing review of the acquired net working capital and acquired net assets of Pacer, the Company recorded an $8.4 million increase in property and equipment, a $5.6 million increase in certain current liabilities and a $1.2 million increase in long-term deferred tax liabilities. These adjustments, along with the adjustments to the equity method investment obligations discussed above, as well as other immaterial adjustments, net, in the acquisition date values of certain current assets and intangible assets, resulted in a $47.5 million increase in the acquisition date value of goodwill associated with the Pacer acquisition.

The fair values and weighted average useful lives of Pacer’s acquired finite-lived intangible assets, as adjusted, as of the date of acquisition were assigned as follows:

	Fair Value (in millions)		Weighted Average Useful Life (in years)
Finite-lived intangible assets:
Backlog	$	6.1	3
Non-compete agreements	2.3		9
Customer relationships	11.0		8
Total acquired finite-lived intangible assets	$	19.4	6

Finite-lived intangible assets are amortized in a manner consistent with the pattern in which the related benefits are expected to be consumed. The intangible asset related to Pacer’s pre-qualifications with selected customer companies has been assigned an indefinite life as the pre-qualifications are not expected to expire or diminish in value, and the companies to which they relate have extremely long operating histories. Goodwill arising from the acquisition represents the estimated value of Pacer’s geographic presence in key high-growth Canadian markets, its assembled workforce, its management team’s industry-specific project management expertise and synergies expected to be achieved from the combined operations of Pacer and MasTec. The goodwill balance is not tax deductible.

The contingent consideration included in the table above equals 25% of the excess, if any, of Pacer’s earnings from continuing operations before interest, taxes, depreciation and amortization (“EBITDA”) above certain thresholds for a five-year period, as set forth in the purchase agreement, and is payable annually in Canadian dollars.The fair value of the earn-out liability was estimated using an income approach and incorporates significant inputs not observable in the market. Key assumptions in the estimated valuation include the discount rate and probability-weighted EBITDA projections. Significant changes in any of these assumptions could result in a significantly higher or lower potential earn-out liability. The range of potential undiscounted payments that MasTec could be required to make under the earn-out arrangement is estimated to be between Canadian $0 and $71 million, or approximately $0 and $54 million as of September 30, 2015; however, there is no maximum earn-out payment amount. As is customary for purchase agreements in the industry, the earn-out agreement contains certain right of offset provisions, under which the Company may, under certain circumstances, offset against the earn-out liability working capital adjustments, indemnification claims and similar items owed from the former owners of the entity.

Other 2014 Acquisitions

Effective April 1, 2014, MasTec acquired 100% of a telecommunications services firm, specializing in the installation of in-home security systems, for an aggregate purchase price composed of approximately $16.3 million in cash, as adjusted for the final net working capital, and a five year earn-out, valued at $0.6 million as of September 30, 2015. Additionally, effective January 1, 2014, MasTec acquired 100% of a telecommunications services firm, specializing in the engineering, installation, furnishing and integration of telecommunications equipment, for an aggregate purchase price composed of approximately $23.8 million in cash and a five year earn-out, valued at $8.7 million as of September 30, 2015. These companies are included in MasTec’s Communications segment.

Unaudited Supplemental Pro Forma Information

The following unaudited supplemental pro forma financial information includes the results of operations of each of the companies acquired

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in 2014 and is presented as if each acquired company had been consolidated as of the beginning of the year immediately preceding the year in which the company was acquired. The unaudited supplemental pro forma financial information has been provided for illustrative purposes only and does not purport to be indicative of the actual results that would have been achieved by the combined companies for the periods presented, or of the results that may be achieved by the combined companies in the future. Future results may vary significantly from the results reflected in the following unaudited supplemental pro forma financial information because of future events and transactions, as well as other factors, many of which are beyond MasTec’s control.

The unaudited supplemental pro forma financial information presented below has been prepared by adjusting the historical results of MasTec to include the historical results of the acquired businesses described above and was then adjusted (i) to remove acquisition costs, including certain acquisition integration costs; (ii) to increase amortization expense resulting from the incremental intangible assets acquired; (iii) to increase interest expense as a result of the cash consideration paid; (iv) to remove integration-related employee redundancy costs; and (v) to reduce interest expense from debt repaid upon acquisition of the respective businesses. The unaudited supplemental pro forma financial information does not include adjustments to reflect the impact of other cost savings or synergies that may result from these acquisitions.

	For the Three Months Ended September 30, 2014		For the Nine Months Ended September 30, 2014
Unaudited pro forma financial information (in millions):
Revenue	$	1,423.5	$	3,854.0
Net income from continuing operations	$	50.6	$	100.2

Results of Businesses Acquired

Revenue and net income (loss) from continuing operations resulting from the year-over-year incremental impact of acquired businesses, which are included within the Company’s condensed unaudited consolidated results of operations for the periods indicated, were as follows (in millions):

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2015		2014		2015			2014
Actual of acquirees(year-over-year impact):			As Restated					As Restated
Revenue	$	69.2	$	133.2	$	301.5		$	342.5
Net income (loss) from continuing operations (a)	$	0.2	$	2.3	$	(13.4	)	$	4.3

(a) Acquiree net income (loss) from continuing operations for the nine month period ended September 30, 2015 includes approximately $9.3 million of pre-tax acquisition integration costs incurred in connection with the WesTower acquisition, and for the three and nine month periods ended September 30, 2015, includes project losses of $2.8 million and $8.3 million, respectively, associated with the Company’s proportionate interest in a non-controlled Canadian joint venture. Other acquisition-related costs, including certain acquisition integration costs totaling $1.9 million and $10.3 million for the three and nine month periods ended September 30, 2015, respectively, and $0.5 million and $2.0 million for the three and nine month periods ended September 30, 2014, respectively, are not included in the above presented acquiree results for the respective periods. The above results also do not include interest expense associated with consideration paid for these acquisitions.

Note 4 - Goodwill and Other Intangible Assets

The following table provides details of goodwill by reportable segment (in millions):

	Communications		Oil and Gas		Electrical Transmission		Power Generation and Industrial		Total Goodwill
Balance as of September 30, 2015	$	418.5	$	378.8	$	149.9	$	117.6	$	1,064.8

Currency translation losses related to goodwill totaled $18.5 million and $4.7 million for the nine month periods ended September 30, 2015 and 2014, respectively. For the nine month period ended September 30, 2015, there were no additions to goodwill from new business combinations, and additions to goodwill from accruals of acquisition-related contingent consideration totaled $0.8 million. Additions to goodwill for the nine month period ended September 30, 2014 from new business combinations totaled $134.2 million, and additions to goodwill from accruals of acquisition-related contingent consideration totaled $4.6 million.

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The following table provides a reconciliation of changes in other intangible assets for the period indicated (in millions):

	Other Intangible Assets
	Non-amortizing					Amortizing
	Trade Names		Pre-Qualifications			Customer Relationships and Backlog			Other (a)			Total
Other intangible assets, gross carrying amount as of December 31, 2014	$	34.8	$	93.3		$	199.8		$	26.3		$	354.2
Accumulated amortization						(90.3		)	(13.5		)	(103.8		)
Other intangible assets, net, as of December 31, 2014	$	34.8	$	93.3		$	109.5		$	12.8		$	250.4
Amortization expense						(20.1		)	(1.4		)	(21.5		)
Currency translation adjustments	—		(7.9		)	(1.8		)	(0.4		)	(10.1		)
Other intangible assets, net, as of September 30, 2015	$	34.8	$	85.4		$	87.6		$	11.0		$	218.8

(a) Consists principally of trade names and non-compete agreements.

Amortization expense associated with intangible assets for the three month periods ended September 30, 2015 and 2014 totaled $6.9 million and $6.6 million, respectively, and for the nine month periods ended September 30, 2015 and 2014, totaled $21.5 million and $17.0 million, respectively.

Note 5 – Fair Value of Financial Instruments

The Company’s financial instruments include cash and cash equivalents, accounts and notes receivable, cash collateral deposited with insurance carriers, life insurance assets, cost and equity method investments, deferred compensation plan assets and liabilities, accounts payable and other current liabilities, acquisition-related contingent consideration, certain intangible assets and liabilities, including off-market contracts, and debt obligations.

Fair value is the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value guidance establishes a valuation hierarchy, which requires maximizing the use of observable inputs when measuring fair value. The three levels of inputs that may be used are: (i) Level 1 - quoted market prices in active markets for identical assets or liabilities; (ii) Level 2 - observable market based inputs or other observable inputs; and (iii) Level 3 - significant unobservable inputs that cannot be corroborated by observable market data, which are generally determined using valuation models incorporating management estimates of market participant assumptions. In instances in which the inputs used to measure fair value fall into different levels of the fair value hierarchy, the fair value measurement classification is determined based on the lowest level input that is significant to the fair value measurement in its entirety.  Management’s assessment of the significance of a particular item to the fair value measurement in its entirety requires judgment, including the consideration of inputs specific to the asset or liability.

Fair values of financial instruments are estimated using public market prices, quotes from financial institutions and other available information. Due to their short-term maturity, the carrying amounts of cash and cash equivalents, accounts receivable and accounts payable and other current liabilities approximate their fair values. Management believes the carrying values of notes receivable, cash collateral deposited with insurance carriers, deferred compensation plan assets and liabilities and outstanding balances on its credit facilities approximate their fair values. Cost and equity method investments are initially recorded at their cost basis.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

As of September 30, 2015 and December 31, 2014, financial instruments required to be measured at fair value on a recurring basis consisted primarily of acquisition-related contingent consideration liabilities, which represent the estimated fair value of additional future earn-outs payable for acquisitions of businesses (“ASC 805 contingent consideration”), in accordance with U.S. GAAP. The fair value of ASC 805 contingent consideration is based on management estimates and entity-specific assumptions, which are Level 3 inputs, and is evaluated on an ongoing basis. As of September 30, 2015 and December 31, 2014, the fair value of the Company’s ASC 805 contingent consideration totaled $94.0 million and $146.1 million, respectively.

There were no additions to ASC 805 contingent consideration from new business combinations for the three month periods ended September 30, 2015 or 2014, or for the nine month period ended September 30, 2015. Additions from new business combinations were $33.6 million for the nine month period ended September 30, 2014. The Company paid approximately $5.5 million, $37.7 million, $1.3 million and $48.3 million, respectively, in connection with ASC 805 contingent consideration for the three and nine month periods ended September 30, 2015 and 2014. For the three and nine month periods ended September 30, 2015, the Company recognized net reductions of $4.4 million and $8.0 million, respectively, of ASC 805 contingent consideration, which related primarily to finalization of earn-out arrangements in the Oil and Gas, Electrical Transmission and Communications segments, and were recorded within other expense (income), net, in the condensed unaudited consolidated statements of operations. Foreign currency translation gains associated with ASC 805 contingent consideration for the three and nine month periods ended September 30, 2015 and 2014 were $2.8 million, $6.4 million, $2.9 million and $2.5 million, respectively.

Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis

Assets and liabilities recognized or disclosed at fair value on a non-recurring basis, for which remeasurement occurs in the event of an impairment or other measurement event, if applicable, include items such as cost and equity method investments, life insurance assets, long-lived assets, goodwill, other intangible assets and liabilities, including off-market contracts and debt. As of both September 30, 2015 and December 31, 2014, the

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carrying amount of the Company’s 4.875% senior notes due 2023 (the “4.875% Senior Notes”) totaled $400 million. As of September 30, 2015 and December 31, 2014, the estimated fair value of the Company’s 4.875% Senior Notes, based on quoted market prices in active markets, a Level 1 input, totaled $332.0 million and $375.0 million, respectively.

Cost and Equity Method Investments. The aggregate carrying value of the Company’s cost and equity method investment assets, including long-term receivables from investees and contractual joint ventures, totaled approximately $68.0 million and $17.7 million as of September 30, 2015 and December 31, 2014, respectively. In June 2015, MasTec invested $6 million, and committed to future equity contributions and/or loan guarantees of up to an additional $78 million, for a 33% equity interest in two joint ventures. As of September 30, 2015, the Company had invested $51 million in these joint ventures and expects to satisfy its remaining commitments in the fourth quarter of 2015. From time to time, MasTec may elect to advance additional amounts above its commitments to fund temporary capital requirements. The joint ventures were formed to design, build, own and operate a header system and two pipelines that will transport natural gas.  A subsidiary of MasTec will construct the pipelines, with construction expected to commence in 2016.Each pipeline is planned to interconnect at the United States/Mexico border with pipelines currently under development and construction in Mexico.

The fair values of the Company’s cost and equity method investments are not readily available. The Company is not aware of events or changes in circumstances that would have a significant adverse effect on the carrying values of its cost and/or equity method investments as of September 30, 2015 or December 31, 2014.

Note 6 - Accounts Receivable, Net of Allowance

The following table provides details of accounts receivable, net of allowance, as of the dates indicated (in millions):

	September 30, 2015			December 31, 2014
Contract billings	$	512.3		$	669.7
Retainage	164.0			162.2
Costs and earnings in excess of billings	356.0			485.6
Accounts receivable, gross	$	1,032.3		$	1,317.5
Less allowance for doubtful accounts	(8.6		)	(13.9		)
Accounts receivable, net	$	1,023.7		$	1,303.6

Retainage, which has been billed, but is not due until the Company’s completion of performance and acceptance by customers, is generally expected to be collected within one year. Receivables expected to be collected beyond one year are recorded within other long-term assets. Provisions for doubtful accounts for the three month periods ended September 30, 2015 and 2014 totaled $1.4 million and $0.3 million, respectively, and for the nine month periods ended September 30, 2015 and 2014 totaled $2.2 million and $1.1 million, respectively. The provision for doubtful accounts for the nine month period ended September 30, 2014 included a reversal of $0.5 million to eliminate a reserve that was not required and should have been reversed in a prior year. Based on materiality considerations, this item was recognized in 2014.

During 2014, the Company entered into a non-recourse financing arrangement, under which certain receivables are purchased by the customer’s bank for a nominal fee. This arrangement improved the collection cycle time of the related receivables, the effect of which amounted to cash collections of approximately $29 million for the nine month period ended September 30, 2015. Cash collected from this arrangement is reflected within cash provided by operating activities. The discount charge amounted to $1.1 million for the nine month period ended September 30, 2015 and is included within interest expense in the consolidated statements of operations.

Note 7 - Property and Equipment, Net

The following table provides details of property and equipment, net, including property and equipment held under capital leases as of the dates indicated (in millions):

	September 30, 2015			December 31, 2014
Land	$	4.6		$	4.6
Buildings and leasehold improvements	21.0			19.9
Machinery and equipment	966.6			926.1
Office furniture and equipment	135.6			126.1
Construction in progress	10.8			12.0
Total property and equipment	$	1,138.6		$	1,088.7
Less accumulated depreciation and amortization	(551.6		)	(465.6		)
Property and equipment, net	$	587.0		$	623.1

The gross amount of capitalized internal-use software, which is included within office furniture and equipment, totaled $100.4 million and $92.7 million as of September 30, 2015 and December 31, 2014, respectively. Capitalized internal-use software, net of accumulated amortization, totaled

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$35.3 million and $33.6 million as of September 30, 2015 and December 31, 2014, respectively. Depreciation and amortization expense associated with property and equipment for the three month periods ended September 30, 2015 and 2014 totaled $35.3 million and $35.2 million, respectively, and totaled $106.6 million and $95.0 million for the nine month periods ended September 30, 2015 and 2014, respectively.

Note 8 - Debt

The following table provides details of the carrying values of debt as of the dates indicated (in millions):

Description	Maturity Date	September 30, 2015			December 31, 2014
Senior secured credit facility:
Revolving loans	October 29, 2018	$	349.3		$	282.7
Term loan	November 21, 2019	250.0			250.0
4.875% senior notes	March 15, 2023	400.0			400.0
Other credit facilities	Varies	9.5			1.2
Capital lease obligations, weighted average interest rate of 2.8%	In installments through June 13, 2021	148.1			176.5
Notes payable, equipment, weighted average interest rate of 2.7%	In installments through June 30, 2018	20.5			24.4
Total debt		$	1,177.4		$	1,134.8
Less current maturities		(78.8		)	(73.6		)
Long-term debt		$	1,098.6		$	1,061.2

Senior Secured Credit Facility

The Company has a senior secured credit facility, referred to as the Credit Facility. Under the Credit Facility, aggregate borrowing commitments total $1.25 billion, composed of $1.0 billion of revolving commitments and a term loan in the aggregate principal amount of $250 million (the “Term Loan”). The Credit Facility provides the ability to borrow in either Mexican pesos or Canadian dollars, up to an aggregate equivalent amount of $200 million. Revolving commitments under the Credit Facility mature on October 29, 2018, and the Term Loan matures on November 21, 2019. The Term Loan is subject to amortization in quarterly principal installments of $3.1 million, subject to reduction as a result of the application of certain prepayments in accordance with the terms of the Credit Facility, commencing as of the quarter ending March 31, 2016 and continuing for each fiscal quarter thereafter. The maximum amount available for letters of credit under the Credit Facility is $450 million, of which up to $100 million can be denominated in either Mexican pesos or Canadian dollars. The Credit Facility also provides for swing line loans of up to $75 million. Under the Credit Facility, the Company has the option to increase revolving commitments and/or establish additional term loan tranches in an aggregate amount of $250 million. Borrowings under the Credit Facility are used for working capital requirements, capital expenditures and other corporate purposes, including equity, joint venture and other investments, the repurchase or prepayment of indebtedness and share repurchases under authorized share repurchase programs. Deferred financing costs associated with the Credit Facility, including the Term Loan, totaled $7.0 million and $6.9 million, net of accumulated amortization as of September 30, 2015 and December 31, 2014, respectively.

As of September 30, 2015 and December 31, 2014, outstanding revolving loans under the Credit Facility accrued interest at weighted average rates of approximately 2.50% and 2.18% per annum, respectively, and the Term Loan accrued interest at a rate of 2.19% and 1.92% as of September 30, 2015 and December 31, 2014, respectively. Letters of credit of approximately $172.4 million and $153.6 million were issued as of September 30, 2015 and December 31, 2014, respectively. As of September 30, 2015 and December 31, 2014, letter of credit fees accrued at 1% and 0.875% per annum, respectively, for performance standby letters of credit and at 2% and 1.75% per annum, respectively, for financial standby letters of credit. Outstanding letters of credit mature at various dates and most have automatic renewal provisions, subject to prior notice of cancellation. As of September 30, 2015 and December 31, 2014, borrowing capacity of $478.3 million and $563.7 million, respectively, was available for revolving loans, or up to $277.6 million and $296.4 million, respectively, for new letters of credit. The unused facility fee was 0.40% and 0.35% as of September 30, 2015 and December 31, 2014, respectively. The Credit Facility is guaranteed by certain subsidiaries of the Company (the “Guarantor Subsidiaries”), and the obligations under the Credit Facility are secured by substantially all of the Company’s and the Guarantor Subsidiaries’ respective assets, subject to certain exceptions.

The Credit Facility is subject to certain provisions and covenants, as more fully described in Note 10 - Debt in the notes to the audited consolidated financial statements included in the 2014 Form 10-K. As of September 30, 2015 and December 31, 2014, MasTec was in compliance with the provisions and covenants of the Credit Facility.

In September 2015, the Company amended the terms of the Credit Facility (the “Amendment”) to provide additional short-term flexibility for potential borrowings. The Amendment provides for a maximum consolidated leverage ratio, as defined in the Credit Facility, of up to (i) 4.25 during the period commencing on September 30, 2015 and ending on September 29, 2016, (ii) 4.00 during the period commencing on September 30, 2016 and ending on December 30, 2016, and (iii) 3.50 thereafter. The Amendment also revised the calculation of Consolidated EBITDA, as defined, as of September 30, 2015 and December 31, 2015 to permit the Company to add back certain cash charges in addition to those previously prescribed. The Company paid consent fees of $1.3 million in connection with the Amendment, which were recorded within deferred financing costs in the third quarter of 2015.

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Other Credit Facilities. The Company has other credit facilities that support the working capital requirements of its foreign operations. Borrowings under these credit facilities, which have varying dates of maturity and are generally renewed on an annual basis, are primarily denominated in Canadian dollars. Maximum borrowing capacity totaled Canadian $40.0 million and $45.0 million as of September 30, 2015 and December 31, 2014, respectively, or approximately $30.0 million and $38.7 million, respectively. Outstanding borrowings totaled approximately $9.5 million and $1.2 million as of September 30, 2015 and December 31, 2014, respectively. Outstanding borrowings accrued interest at a weighted average rate of 3.8% and 4.0% as of September 30, 2015 and December 31, 2014, respectively. Outstanding borrowings that are not renewed are repaid with borrowings under the Credit Facility. Accordingly, the carrying amounts of the Company’s borrowings under its other credit facilities are classified within long-term debt in the Company’s consolidated balance sheets. The Company’s other credit facilities are subject to customary provisions and covenants.

4.875% Senior Notes

The Company has $400 million outstanding principal amount of 4.875% Senior Notes, which are subject to certain provisions and covenants, as more fully described in Note 10 - Debt in the notes to the audited consolidated financial statements included in the 2014 Form 10-K, including a requirement to file with the Securities and Exchange Commission (the “SEC”) annual and quarterly reports. In connection with the delayed filing of the Company’s 2014 Form 10-K and its First Quarter 2015 Form 10-Q, the Company received a consent from the holders of the 4.875% Senior Notes (the “Note Holders”) that extended these reporting requirements to August 1, 2015, subject to a 60-day cure period. With the filing of its First Quarter 2015 Form 10-Q, the Company met the reporting requirements with respect to its 4.875% Senior Notes. The Company paid a 25 basis point fee, or $0.9 million, to its Note Holders, and a 20 basis point fee, or $0.8 million, to its solicitation agent in connection with this consent in 2015. The Note Holders’ fee and solicitation agent’s fee were recorded within deferred financing costs and interest expense, respectively.

Debt Guarantees and Covenants

The 4.875% Senior Notes are senior unsecured unsubordinated obligations and rank equal in right of payment with existing and future unsubordinated debt, and rank senior in right of payment to existing and future subordinated debt and are fully and unconditionally guaranteed on an unsecured, unsubordinated, joint and several basis by certain of the Company’s existing and future 100%-owned direct and indirect domestic subsidiaries that are each guarantors of the Credit Facility or other outstanding indebtedness. See Note 17 - Supplemental Guarantor Condensed Unaudited Consolidating Financial Information.

MasTec was in compliance with the provisions and covenants contained in its outstanding debt instruments as of September 30, 2015 and December 31, 2014.

Additional Information

For detailed discussion and additional information pertaining to the Company’s debt instruments, see Note 10 - Debt in the notes to the Company’s audited consolidated financial statements included in its 2014 Form 10-K.

Interest Expense, Net

The following table provides details of interest expense, net, for the periods indicated (in millions):

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2015			2014			2015			2014
Interest expense:
Contractual and other interest expense (a)	$	11.3		$	11.3		$	34.3		$	31.6
Accretion of senior convertible note discount	—			0.6			—			3.4
Amortization of deferred financing costs	0.7			0.8			2.0			2.7
Total interest expense	$	12.0		$	12.7		$	36.3		$	37.7
Interest income	(0.0		)	(0.1		)	(0.5		)	(0.1		)
Interest expense, net	$	12.0		$	12.6		$	35.8		$	37.6

(a) Contractual and other interest expense for the nine month period ended September 30, 2015 includes $0.8 million of consent solicitation agent fees that were incurred in the second quarter of 2015 related to the delay in filing of the Company’s 2014 Form 10-K and its First Quarter 2015 Form 10-Q, as well as $1.1 million of discount fees related to financing arrangements.

As of September 30, 2015 and December 31, 2014, accrued interest payable, which is recorded within other accrued expenses in the consolidated balance sheets, totaled $2.7 million and $7.4 million, respectively.

Note 9 - Lease Obligations

Capital Leases

MasTec enters into agreements that provide financing for machinery and equipment, which expire on various dates. The gross amount of assets held under capital leases as of September 30, 2015 and December 31, 2014, which are included within property and equipment, net, in the consolidated balance sheets, totaled $301.5 million and $281.6 million, respectively. Assets held under capital leases, net of accumulated depreciation, totaled $212.5 million and $217.8 million as of September 30, 2015 and December 31, 2014, respectively.

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Operating Leases

In the ordinary course of business, the Company enters into non-cancelable operating leases for certain of its facility, vehicle and equipment needs, including related party leases. Rent expense relating to operating leases that have non-cancelable terms in excess of one year totaled approximately $20.5 million and $18.1 million for the three month periods ended September 30, 2015 and 2014, respectively, and totaled $59.9 million and $51.5 million for the nine month periods ended September 30, 2015 and 2014, respectively. The Company also incurred expenses relating to facilities, vehicles and equipment having original terms of one year or less totaling approximately $51.4 million and $54.5 million for the three month periods ended September 30, 2015 and 2014, respectively, and totaling $148.5 million and $142.6 million for the nine month periods ended September 30, 2015 and 2014, respectively.

Note 10 – Stock-Based Compensation and Other Employee Benefit Plans

The Company has stock-based compensation plans, under which stock options, restricted stock awards and restricted stock units are reserved for issuance. Under all stock-based compensation plans in effect as of September 30, 2015, there were approximately 5,378,000 shares available for future grant.

Restricted Shares

MasTec grants restricted stock awards and restricted stock units (together “restricted shares”), which are valued based on the closing share price of MasTec common stock on the date of grant. During the restriction period, holders of restricted stock awards are entitled to vote the shares. Total unearned compensation related to restrictedshares as ofSeptember 30, 2015was approximately$16.8 million, which is expected to be recognized over a weighted average period of approximately1.6years. The intrinsic value, or fair value, of restricted shares that vested, which is based on the market price on the date of vesting, totaled $0.2 million and $1.1 million for the three month periods ended September 30, 2015 and 2014, respectively, and totaled $3.7 million and $7.1 million for the nine month periods ended September 30, 2015 and 2014, respectively.

Activity, restricted shares:	Restricted Shares		Per Share Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2014	1,414,645		$	25.32
Granted	87,690		18.40
Vested	(199,235	)	18.22
Canceled/forfeited	(17,774	)	28.42
Non-vested restricted shares, as of September 30, 2015	1,285,326		$	25.90

Stock Options

The Company has granted options to purchase its common stock to employees and members of the Board of Directors and affiliates under various stock option plans at not less than the fair market value of the underlying stock on the date of grant. All outstanding stock options are fully vested.

Activity, stock options:	StockOptions		Per Share Weighted AverageExercise Price		Weighted Average Remaining Contractual Life(in years)	Aggregate Intrinsic Value (a) (in millions)
Options outstanding and exercisable as of December 31, 2014	284,671		$	12.06	1.29	$	3.0
Exercised	(71,971	)	9.00
Options outstanding and exercisable as of September 30, 2015	212,700		$	13.10	0.79	$	0.6

(a) Amount represents the difference between the exercise price and the closing share price of the Company’s stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options.

The intrinsic value of options exercised, which is based on the difference between the exercise price and the closing market share price of the Company’s common stock on the date of exercise, totaled $0.7 million and $6.5 million for the nine month periods ended September 30, 2015 and 2014, respectively. Proceeds from options exercised during the nine month periods ended September 30, 2015 and 2014 totaled $0.4 million and $0.8 million, respectively.

Employee Stock Purchase Plans

The Company has certain employee stock purchase plans (collectively “ESPPs”) under which shares of the Company's common stock are available for purchase by eligible employees. The following table provides details pertaining to the Company’s ESPPs for the periods indicated:

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	For the Nine Months Ended September 30,
	2015		2014
Cash proceeds (in millions)	$	1.3	$	2.5
Common shares issued	86,687		94,761
Weighted average price per share	$	15.33	$	26.60
Weighted average per share grant date fair value	$	4.20	$	6.34

Due to the delay in filing of the Company’s 2014 Form 10-K, contributions to the ESPPs were temporarily suspended in the second quarter of 2015. Contributions resumed in the third quarter of 2015.

Non-CashStock-Based Compensation Expense

Details of non-cash stock-based compensation expense and related tax benefits for the periods indicated were as follows (in millions):

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2015		2014		2015		2014
Non-cash stock-based compensation expense	$	3.2	$	4.1	$	9.5	$	11.6
Income Tax Effects:
Income tax benefit from non-cash stock-based compensation	$	1.2	$	1.8	$	3.7	$	8.4
Excess tax benefit from non-cash stock-based compensation (a)	$	0.0	$	0.1	$	0.1	$	3.5

(a) Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with exercised stock options and vested restricted shares, are classified as financing cash flows in the Company’s condensed unaudited consolidated statements of cash flows.

Note 11 – Other Retirement Plans

Multi-Employer Plans. Certain of MasTec’s subsidiaries, including certain subsidiaries in Canada, contribute amounts to multi-employer pension and other multi-employer benefit plans and trusts, which are recorded as a component of employee wages and salaries within costs of revenue, excluding depreciation and amortization. Contributions are generally based on fixed amounts per hour per employee for employees covered under these plans. Multi-employer plan contribution rates are determined annually and assessed on a “pay-as-you-go” basis based on union employee payrolls. Union payrolls cannot be determined for future periods because the number of union employees employed at any given time, and the plans in which they may participate, vary depending upon the location and number of ongoing projects at a given time and the need for union resources in connection with those projects.Total contributions to multi-employer plans, and the related number of employees covered by these plans, including with respect to the Company’s Canadian operations, for the periods indicated were as follows:

	Multi-Employer Plans
	Covered Employees		Contributions (in millions)
	Low	High	Pension		Post-Retirement Benefit		Total
For the Three Months Ended September 30:
2015	1,689	2,463	$	7.4	$	2.2	$	9.6
2014	2,029	2,167	$	11.6	$	1.1	$	12.7
For the Nine Months Ended September 30:
2015	590	2,463	$	20.0	$	6.6	$	26.6
2014	1,098	2,167	$	27.3	$	2.5	$	29.8

Note 12 – Equity

Share Activity

During the fourth quarter of 2014, the Company’s Board of Directors authorized a $100 million share repurchase program (the “2014 Share Repurchase Program”), which provided the Company the ability to repurchase shares of its common stock from time to time in open market transactions or in privately-negotiated transactions, in accordance with applicable securities laws. Repurchased shares are held in the Company’s treasury. During the first half of 2015, the Company repurchased 5.2 million shares of its common stock for an aggregate purchase price of $100 million, which completed the 2014 Share Repurchase Program.

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Share Activity (in thousands):	Common Shares Outstanding		Treasury Shares
Balance as of December 31, 2014	84,739		2,876
Shares issued:
Stock option exercises	72
Restricted share awards	199
Common stock repurchases	(5,218	)	5,218
Other, net	65
Balance as of September 30, 2015	79,857		8,094

Accumulated Other Comprehensive Loss

Accumulated other comprehensive losses totaled $66.1 million and $34.0 million as of September 30, 2015 and December 31, 2014, respectively. For the three and nine month periods ended September 30, 2015, unrealized foreign currency translation losses totaled $13.3 million and $32.1 million, respectively. For the three and nine month periods ended September 30, 2014, unrealized foreign currency translation losses totaled $13.0 million and $10.6 million, respectively. Unrealized foreign currency gains and losses relate primarily to fluctuations in foreign currency exchange rates of the Company’s foreign subsidiaries with a functional currency other than the U.S. dollar. Foreign currency activity, which has grown in recent years due to acquisitions, is related primarily to the Company’s Canadian operations.

Note 13 - Income Taxes

In determining the quarterly provision for income taxes, management uses an estimated annual effective tax rate based on forecasted annual pre-tax income, permanent tax differences, statutory tax rates and tax planning opportunities in the various jurisdictions in which the Company operates. The effect of significant discrete items is separately recognized in the quarter(s) in which they occur. For the nine month period ended September 30, 2015, the Company incurred $2.6 million of income tax expense in connection with the non-recurring cumulative revaluation of certain deferred tax liabilities pursuant to an Alberta provincial income tax law that was enacted as of June 29, 2015. As of September 30, 2015, the Company had $26.9 million of current deferred tax assets, net, and $186.6 million of long-term deferred tax liabilities, net. As of December 31, 2014, current deferred tax assets, net, totaled $31.7 million and long-term deferred tax liabilities, net, totaled $203.5 million.

Note 14 - Segments and Related Information    

Segment Discussion

MasTec manages its continuing operations under five operating segments, which represent MasTec’s five reportable segments: (1) Communications; (2) Oil and Gas; (3) Electrical Transmission; (4) Power Generation and Industrial and (5) Other. This structure is generally focused on broad end-user markets for MasTec’s labor-based construction services.All five reportable segments derive their revenue from the engineering, installation and maintenance of infrastructure, primarily in North America. In the first quarter of 2015, the Company reevaluated the activities of a non-controlled Canadian joint venture associated with a 2014 acquisition. Accordingly, segment information for prior periods has been adjusted retrospectively to conform to the current period presentation. The reclassified amounts were not material in the periods previously presented. See Note 16 - Segments and Related Information in the Company’s 2014 Form 10-K for additional details.

The Communications segment performs engineering, construction and maintenance of communications infrastructure primarily related to wireless and wireline/fiber communications and install-to-the-home customers, and, to a lesser extent, infrastructure for electrical utilities.MasTec performs engineering, construction and maintenance services on oil and natural gas pipelines and processing facilities for the energy and utilities industries through its Oil and Gas segment.The Electrical Transmission segment primarily serves the energy and utility industries through the engineering, construction and maintenance of electrical transmission lines and substations.The Power Generation and Industrial segment primarily serves energy, utility and other end-markets through the installation and construction of conventional and renewable power facilities, related electrical transmission infrastructure, ethanol facilities and various types of industrial infrastructure.The Other segment primarily includes a proportionately consolidated joint venture and other small business units that perform construction services for a variety of end-markets in Canada, Mexico and elsewhere internationally.

Earnings before interest, taxes, depreciation and amortization (“EBITDA”) is the measure of profitability used by management to manage its segments and, accordingly, in its segment reporting. As appropriate, the Company supplements the reporting of consolidated financial information determined in accordance with U.S. GAAP with certain non-U.S. GAAP financial measures, including EBITDA. The Company believes these non-U.S. GAAP measures provide meaningful information and help investors in understanding the Company’s financial results and in assessing its prospects for future performance. The Company uses EBITDA to evaluate its performance, both internally and versus that of its peers, because it excludes certain items that may not be indicative of the Company’s reportable segment results, as well as items that can vary widely across different industries or among companies within the same industry. Segment EBITDA is calculated in a manner consistent with consolidated EBITDA.

For the three and nine month periods ended September 30, 2015: (i) Communications segment EBITDA included $1.2 million and $17.8 million, respectively, of acquisition integration costs resulting from the WesTower acquisition; (ii) Electrical Transmission segment EBITDA included a $12.2 million charge relating to a court mandated mediation settlement; (iii) Other segment EBITDA included $2.8 million and $8.3 million, respectively, of project losses on a non-controlled proportionately consolidated Canadian joint venture; (iv) Corporate segment EBITDA included $4.1 million and $14.6 million, respectively, of Audit Committee independent investigation related costs; and (v) Power Generation and Industrial segment EBITDA included $3.8 million and $21.4 million, respectively, of losses on a Canadian wind project.

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Summarized financial information for MasTec’s reportable segments is presented and reconciled to consolidated financial information for total MasTec in the following tables (in millions):

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2015			2014			2015			2014
Revenue:				As Restated						As Restated
Communications (a)	$	513.3		$	505.2		$	1,452.1		$	1,480.4
Oil and Gas	406.9			554.4			1,144.2			1,299.3
Electrical Transmission	75.9			138.4			270.2			329.1
Power Generation and Industrial	115.0			114.3			302.3			263.1
Other	3.8			4.1			17.2			10.6
Eliminations	(3.9		)	(0.9		)	(5.1		)	(2.0		)
Consolidated revenue	$	1,111.0		$	1,315.5		$	3,180.9		$	3,380.5

(a) Revenue generated by utilities customers represented 11.2% and 7.6% of Communications segment revenue for the three month periods ended September 30, 2015 and 2014, respectively, and represented 10.5% and 7.0% for the nine month periods ended September 30, 2015 and 2014, respectively.

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2015			2014			2015			2014
EBITDA - Continuing Operations:				As Restated						As Restated
Communications	$	49.7		$	52.5		$	141.8		$	153.7
Oil and Gas	51.0			73.4			113.9			144.2
Electrical Transmission	(23.7		)	18.5			(47.6		)	35.1
Power Generation and Industrial	4.8			4.9			3.9			9.4
Other	(2.0		)	(0.7		)	(7.1		)	(0.1		)
Corporate	(12.0		)	(14.4		)	(40.5		)	(38.7		)
Consolidated EBITDA - Continuing operations	$	67.8		$	134.2		$	164.4		$	303.6

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
Depreciation and Amortization:	2015		2014		2015		2014
Communications	$	13.2	$	10.1	$	37.6	$	30.1
Oil and Gas	20.0		23.3		64.3		61.3
Electrical Transmission	5.5		5.2		16.0		11.9
Power Generation and Industrial	1.7		1.7		5.0		4.8
Other	0.0		0.0		0.1		0.0
Corporate	1.8		1.4		5.0		3.9
Consolidated depreciation and amortization	$	42.2	$	41.7	$	128.0	$	112.0

The following table presents a reconciliation of EBITDA to consolidated income from continuing operations before income taxes (in millions):

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	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2015			2014			2015			2014
EBITDA Reconciliation:				As Restated						As Restated
EBITDA - Continuing operations	$	67.8		$	134.2		$	164.4		$	303.6
Less:
Interest expense, net	(12.0		)	(12.6		)	(35.8		)	(37.6		)
Depreciation and amortization	(42.2		)	(41.7		)	(128.0		)	(112.0		)
Income from continuing operations before income taxes	$	13.6		$	79.8		$	0.5		$	154.0

Foreign Operations. MasTec operates in North America, primarily in the United States and Canada, as well as in Mexico and in other countries in Latin America. For the three month periods ended September 30, 2015 and 2014, revenue of $1.0 billion and $1.1 billion, respectively, was derived from U.S. operations, and revenue of $115.2 million and $219.7 million, respectively, was derived from foreign operations, primarily in Canada. For the nine month periods ended September 30, 2015 and 2014, revenue of $2.7 billion and $2.9 billion, respectively, was derived from U.S. operations, and revenue of $451.2 million and $460.3 million, respectively, was derived from foreign operations, primarily in Canada. The majority of the Company’s foreign operations during the three and nine month periods ended September 30, 2015 and 2014 were in the Company’s Oil and Gas segment. Long-lived assets held in the United States included property and equipment, net, of $482.4 million and $494.1 million as of September 30, 2015 and December 31, 2014, respectively. Long-lived assets held in foreign countries, primarily in Canada, included property and equipment, net, of $104.6 million and $129.0 million as of September 30, 2015 and December 31, 2014, respectively. As of both September 30, 2015 and December 31, 2014 intangible assets and goodwill, net, totaled approximately $1.1 billion related to the Company’s U.S. operations. Intangible assets and goodwill, net, of approximately $193.9 million and $227.7 million as of September 30, 2015 and December 31, 2014, respectively, related to businesses in foreign countries, primarily in Canada. Foreign customers accounted for approximately 16% and 20% of the Company’s consolidated net accounts receivable position, which represents accounts receivable, net, less billings in excess of costs and earnings, as of September 30, 2015 and December 31, 2014, respectively.

Significant Customers

Revenue concentration information for significant customers as a percentage of total consolidated revenue was as follows:

	For the Three Months Ended September 30,		For the Nine Months Ended September 30,
	2015	2014	2015	2014
Customer:		As Restated		As Restated
AT&T (including DIRECTV®) (a)(b)	31%	28%	31%	33%
Enbridge, Inc. (c)	0%	10%	1%	10%

(a) The Company’s relationship with AT&T is based upon multiple separate master service agreements, other service agreements and construction/installation contracts for AT&T’s (i) wireless, (ii) wireline/fiber, (iii) home security and automation businesses, and (iv) for DIRECTV® services, is based upon an agreement to provide installation and maintenance services. Revenue from AT&T is included in the Communications segment.

(b) DIRECTV® was acquired by AT&T in July 2015. Revenue from DIRECTV® is presented on a combined basis with AT&T for all periods.

(c) The Company’s relationship with Enbridge, Inc. is based upon various construction contracts for natural gas pipelines. Revenue from Enbridge, Inc. is included in the Oil and Gas segment.

Note 15 - Commitments and Contingencies

In addition to the matters discussed below, MasTec is subject to a variety of legal cases, claims and other disputes that arise from time to time in the ordinary course of its business. MasTec cannot provide assurance that it will be successful in recovering all or any of the potential damages it has claimed or in defending claims against it. The outcome of such cases, claims and disputes, including those set forth below, cannot be predicted with certainty and an unfavorable resolution of one or more of them could have a material adverse effect on the Company’s business, financial condition, results of operations and cash flows.

PPL. In October 2012, PPL Electric Utilities Corporation (“PPL”) and T&D Power, Inc., a MasTec, Inc. subsidiary (“T&D”), entered into a $206 million overhead transmission line construction contract (the “Contract”), pursuant to which T&D agreed to construct an approximately 100 mile transmission line in Pennsylvania. In September 2013, PPL issued a notice terminating the Contract for convenience. T&D then submitted termination invoices to recover certain pre-termination costs, overhead and profit, as well as termination-related demobilization costs, along with the applicable overhead and profit. PPL disputes these invoices. As a result of the dispute, T&D sued PPL in December 2013 in federal court in the Eastern District of Pennsylvania, and pursued claims in excess of $40 million for breach of contract, including PPL’s breach of its implied duty of good faith and fair dealing. After the parties completed discovery, in July 2015, PPL filed a motion for partial summary judgment, which was subsequently denied by the federal court. On October 5, 2015, trial proceedings commenced and during this process, the federal court required the parties to mediate, resulting in a settlement agreement in which the Company was awarded monies to be received in the fourth quarter of 2015. This settlement resulted in a charge of $12.2 million, related to the reduction of receivables associated with this contract. This charge was recorded within other expense of the Electrical Transmission segment in the third quarter of 2015.

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SunLight Entities.In 2011, Power Partners MasTec, LLC., a MasTec, Inc. subsidiary (“Power Partners”), entered into engineering, procurement, and construction agreements (the “EPC Agreements”) with special purpose entities, SunLight General Somerset Solar, LLC, SunLight General Morris Solar, LLC and SunLight General Sussex Solar, LLC (collectively, the “SunLight Entities”), respectively, to perform design and construction services for three public solar projects in New Jersey located in Somerset, Morris and Sussex Counties (the “Projects”). Power Partners and the SunLight Entities engaged in three separate arbitration proceedings against each other to address various disputes that existed between the parties regarding the Projects. In August 2014, the arbitration panel rendered awards in Power Partners’ favor in the aggregate amount of approximately $68 million, including fees and expenses. Power Partners also filed a lawsuit in June 2013 in federal court in New Jersey against the Somerset and Morris Authorities (the “Authorities”) and the principals of the SunLight Entities with claims exceeding $60 million as part of its efforts to seek payment of amounts that were also the subject of the arbitration proceedings.

In March 2015, the Authorities, the SunLight Entities and principals and Power Partners entered into separate settlement agreements. As part of the settlement, Power Partners received amounts that were substantially equal to the previously recorded amounts, and all of the parties executed mutual releases.

Wrigley v. MasTec, Inc. On May 7, 2015, a putative class action lawsuit (the “Lawsuit”), Wrigley v. MasTec, Inc., et. al. (Case No. 1:15-cv-21740) was filed in the United States District Court, Southern District of Florida, naming the Company, the Company’s Chief Executive Officer, José R. Mas, and the Company’s Chief Financial Officer, George L. Pita, as defendants. On August 5, 2015, co-lead plaintiffs were appointed, and an amended complaint was filed on October 13, 2015. The Lawsuit has been purportedly brought by a shareholder, both individually and on behalf of a putative class of shareholders, alleging violations of the federal securities laws arising from alleged false or misleading statements contained in, or alleged material omissions from, certain of the Company’s filings with the SEC and other statements, in each case with respect to accounting matters that are the subject of the Audit Committee’s independent internal investigation. The amended complaint seeks damages stemming from losses Plaintiffs claim to have suffered as a result of purchasing Company securities at an allegedly inflated market price. The Company believes that the Lawsuit is without merit and intends to vigorously defend against it; however, there can be no assurance that the Company will be successful in its defense.

Other Commitments and Contingencies

Regulatory Matters. The Company has self-reported to the staff of the SEC (“the Staff”) regarding the previously disclosed Audit Committee’s independent investigation and is cooperating with the Staff’s requests for additional information regarding the investigation. The Company intends to continue full cooperation with the SEC.

Leases. In the ordinary course of business, the Company enters into non-cancelable operating leases for certain of its facility, vehicle and equipment needs, including related party leases. See Note 9 - Lease Obligations.

Letters of Credit. In the ordinary course of business, the Company is required to post letters of credit for its insurance carriers, surety bond providers and in support of performance under certain contracts. Such letters of credit are generally issued by a bank or similar financial institution. The letter of credit commits the issuer to pay specified amounts to the holder of the letter of credit under certain conditions. If this were to occur, the Company would be required to reimburse the issuer of the letter of credit, which, depending upon the circumstances, could result in a charge to earnings. As of September 30, 2015 and December 31, 2014, there were $172.4 million and $153.6 million, respectively, of letters of credit issued under the Company’s Credit Facility. The Company is not aware of material claims relating to outstanding letters of credit as of September 30, 2015 or December 31, 2014.

Performance and Payment Bonds. In the ordinary course of business, MasTec is required by certain customers to provide performance and payment bonds for some of the Company’s contractual commitments related to projects in process. These bonds provide a guarantee to the customer that the Company will perform under the terms of a contract and that the Company will pay subcontractors and vendors. If the Company fails to perform under a contract or to pay subcontractors and vendors, the customer may demand that the surety make payments or provide services under the bond. The Company must reimburse the surety for expenses or outlays it incurs. As of September 30, 2015, the estimated cost to complete projects secured by the Company’s $553.7 million in performance and payment bonds was $44.1 million. As of December 31, 2014, the estimated cost to complete projects secured by the Company’s $748.3 million in performance and payment bonds was $60.1 million. These amounts do not include performance and payment bonds associated with the Company’s equity method investments and contractual joint venture, which are separately disclosed in Note 3 - Acquisitions.

Investments in Affiliates and Other Entities. The Company holds an undivided interest in a contractual joint venture, which is not controlled by the Company and is managed by a third party, for the purpose of providing infrastructure construction services under a civil construction project. The contractual joint venture automatically terminates upon completion of the project. Losses incurred by the joint venture are generally shared proportionally by the joint venture members, with members of the joint venture jointly and severally liable for all of the obligations of the joint venture. The joint venture agreement provides that each joint venture partner indemnify the other party for any liabilities incurred by such joint venture in excess of its ratable portion of such liabilities. Thus, it is possible that the Company could be required to pay or perform obligations in excess of its share if the other joint venture partner fails or refuses to pay or perform its share of the obligations. As of September 30, 2015, the Company was not aware of circumstances that would reasonably lead to future claims against it for material amounts. From time to time, the Company may provide financing to its unconsolidated affiliates, including its equity method investees and/or contractual joint venture. See Note 3 - Acquisitions and Note 5 - Fair Value of Financial Instruments for discussion pertaining to certain of the Company’s cost and equity method investees and other investment arrangements, including funding provided and amounts committed.

Self-Insurance. MasTec maintains insurance policies for workers’ compensation, general liability and automobile liability, which are subject to per claim deductibles. The Company also maintains excess umbrella coverage. As of September 30, 2015 and December 31, 2014, MasTec’s liability for unpaid claims and associated expenses, including incurred but not reported losses related to these policies, totaled $74.0 million and $70.3 million, respectively, of which $43.9 million and $39.6 million, respectively, were reflected within other long-term liabilities in the consolidated balance sheets.

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MasTec also maintains an insurance policy with respect to employee group medical claims, which is subject to annual per employee maximum losses. MasTec’s liability for employee group medical claims as of September 30, 2015 and December 31, 2014 totaled $3.2 million and $4.4 million, respectively.

The Company is required to post letters of credit and provide cash collateral to certain of its insurance carriers and to provide surety bonds in certain states. Insurance-related letters of credit for the Company’s workers’ compensation, general liability and automobile liability policies amounted to $74.2 million and $75.0 million as of September 30, 2015 and December 31, 2014, respectively. In addition, cash collateral deposited with insurance carriers, which is included within other long-term assets in the consolidated balance sheets, amounted to $1.3 million and $1.2 million for these policies as of September 30, 2015 and December 31, 2014, respectively. Outstanding surety bonds related to workers’ compensation self-insurance programs amounted to $13.0 million as of both September 30, 2015 and December 31, 2014.

Employment Agreements. The Company has employment agreements with certain executives and other employees, which provide for compensation and certain other benefits and for severance payments under certain circumstances. Certain employment agreements also contain clauses that become effective upon a change in control of the Company. Upon the occurrence of any of the defined events in the various employment agreements, the Company would be obligated to pay certain amounts to the relevant employees, which vary with the level of the employees’ respective responsibility.

Collective Bargaining Agreements and Multi-Employer Plans.Certain of MasTec’s subsidiaries are party to various collective bargaining agreements with unions representing certain of their employees. These agreements require the subsidiaries party to the agreements to pay specified wages, provide certain benefits to their union employees and contribute certain amounts to multi-employer pension plans and employee benefit trusts. The collective bargaining agreements expire at various times and have typically been renegotiated and renewed on terms similar to the ones contained in the expiring agreements.

The Employee Retirement Income Security Act of 1974, as amended by the Multi-Employer Pension Plan Amendments Act of 1980 (collectively, “ERISA”), which governs U.S.-registered multi-employer pension plans, subjects employers to substantial liabilities in the event of the employer’s complete or partial withdrawal from, or upon termination of, such plans. Under current law pertaining to employers who are contributors to U.S.-registered multi-employer defined benefit plans, a plan’s termination, an employer’s voluntary withdrawal from, or the mass withdrawal of contributing employers from, an underfunded multi-employer defined benefit plan requires participating employers to make payments to the plan for their proportionate share of the multi-employer plan’s unfunded vested liabilities. These liabilities include an allocable share of the unfunded vested benefits of the plan for all plan participants, not only for benefits payable to participants of the contributing employer. As a result, participating employers may bear a higher proportion of liability for unfunded vested benefits if the other participating employers cease to contribute to, or withdraw from, the plan. The allocable portion of liability to participating employers could be more disproportionate if employers that have withdrawn from the plan are insolvent, or if they otherwise fail to pay their proportionate share of the withdrawal liability. The Company currently contributes, and in the past has contributed to, plans that are underfunded, and, therefore, could have potential liability associated with a voluntary or involuntary withdrawal from, or termination of, these plans. While the Company does not currently have plans to withdraw from, and is not aware of related liabilities associated with these plans, there can be no assurance that the Company will not be assessed liabilities in the future. The Pension Protection Act of 2006 (“PPA”) added funding rules to U.S.-registered plans classified as “endangered,” “seriously endangered,” or “critical” status. The PPA requires that underfunded pension plans improve their funding ratios within prescribed intervals based on their level of underfunding. If a plan is in critical status, benefit reductions may apply and/or participating employers could be required to make additional contributions. In addition, if a multi-employer defined benefit plan fails to satisfy certain minimum funding requirements, the Internal Revenue Service (“IRS”) may impose on the employers contributing to such plan a non-deductible excise tax of 5% of the amount of the accumulated funding deficiency.

Based upon the information available to the Company from plan administrators as of September 30, 2015, several of the multi-employer pension plans in which it participates are underfunded and, as a result, the Company could be required to increase its contributions. Some of the Company’s subsidiaries have also been notified that certain plans to which they contribute are in “critical” status and require additional contributions in the form of a surcharge on future benefit contributions required for future work performed by union employees covered by these plans. The amount of additional funds the Company may be obligated to contribute in the future cannot be estimated, as these amounts are based on future levels of work of the union employees covered by the plans.

In November 2014, the Company, along with other members of the Pipe Line Contractors Association (“PLCA”), voluntarily terminated its participation in several defined benefit multi-employer pension plans. No withdrawal liability was assessed as of the date of the Company’s termination of participation in these plans. There can be no assurance, however, that these plans, which were in critical status as of the date the Company terminated its participation, will not assess penalties in the future. Additionally, in November 2011, the Company, along with other members of the PLCA, voluntarily withdrew from the Central States Southeast and Southwest Areas Pension Fund (“Central States”), a defined benefit multi-employer pension plan that is in critical status. In connection with this withdrawal, a $6.4 million withdrawal liability was established based on an estimate provided by the Central States administrator as of the date of withdrawal. The Company began paying installments towards this withdrawal liability in 2013, of which $3.3 million and $4.2 million was outstanding as of September 30, 2015 and December 31, 2014, respectively. The Company withdrew from Central States in order to mitigate its liability in connection with the plan; however, Central States has asserted that the PLCA members did not effectively withdraw in 2011 and are, therefore, responsible for a withdrawal liability that includes 2011 contribution amounts. By letter dated March 14, 2013, Central States demanded $11 million in withdrawal liability from the Company, which included 2011 contribution amounts. The Company is vigorously opposing this demand because it believes that it legally and effectively withdrew from Central States in November 2011. If Central States were to prevail in its assertion that the Company withdrew after that date, then the initial amount of the Company’s withdrawal liability would increase to approximately $11 million. This dispute over the proper withdrawal date was litigated in federal court. In September 2015, the withdrawal date dispute was resolved in the PLCA’s favor by the U.S. Court of Appeals for the Seventh Circuit in a decision finding that the PLCA members lawfully and effectively withdrew from Central States by and through their actions in 2011. If Central States or other plans from which the Company has withdrawn were to undergo a mass withdrawal, as defined by ERISA and the Pension Benefit Guaranty Corporation, within the three-year period commencing with the beginning of the calendar year during which the Company effectively withdrew from the plan, there could be additional liability. Given the uncertain nature of the outcome of these factors, the ultimate withdrawal liability can only be estimated.

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Indemnities. The Company generally indemnifies its customers for the services it provides under its contracts, as well as other specified liabilities, which may subject the Company to indemnity claims, liabilities and related litigation. As of September 30, 2015 and December 31, 2014, the Company was not aware of material asserted or unasserted claims in connection with these indemnity obligations.

Other Guarantees.In the ordinary course of its business, from time to time, MasTec guarantees the obligations of its subsidiaries, including obligations under certain contracts with customers, certain lease obligations and in some states, obligations in connection with obtaining contractors’ licenses. MasTec has also issued performance and other guarantees in connection with its undivided interest in a contractual joint venture and certain of its equity investees. See Note 3 - Acquisitions and Note 5 - Fair Value of Financial Instruments for discussion of certain of the Company’s equity method investees and other investment arrangements, including related guarantees. MasTec also generally warrants the work it performs for a one to two year period following substantial completion of a project. MasTec has not historically accrued reserves for potential warranty claims as they have been immaterial.

Concentrations of Risk. In the third quarter of 2015, DIRECTV^® was acquired by AT&T. Taking into consideration the July 2015 acquisition of DIRECTV^® by AT&T, the Company had approximately 480 customers for the nine month period ended September 30, 2015. Revenue from DIRECTV® is presented on a combined basis with AT&T for all periods presented. As of September 30, 2015, one customer accounted for approximately 10% of the Company’s consolidated net accounts receivable position, which represents accounts receivable, net, less billings in excess of costs and earnings. As of December 31, 2014, one customer accounted for 19% of the Company’s consolidated net accounts receivable position. In addition, the Company derived 64% and 65% of revenue from its top ten customers for the three month periods ended September 30, 2015 and 2014, respectively, and derived 60% and 68% of revenue, respectively, from its top ten customers for the nine month periods ended September 30, 2015 and 2014.

Note 16 - Related Party Transactions

MasTec purchases, rents and leases equipment used in its business from a number of different vendors on a non-exclusive basis, including Cross Country Pipeline Supply, Inc. (“CCP”), in which the Company has a cost method investment of $15 million, resulting from its investment in CCP in 2013. Juan Carlos Mas, who is the brother of Jorge Mas, Chairman of MasTec’s Board of Directors, and José R. Mas, MasTec’s Chief Executive Officer, serves as the chairman of CCP. Additionally, an entity owned by Jorge, José and Juan Carlos Mas is a minority shareholder of CCP. For the three month periods ended September 30, 2015 and 2014, MasTec paid CCP approximately $4.8 million and $1.9 million, respectively, for equipment rentals, leases and servicing. For the nine month periods ended September 30, 2015 and 2014, MasTec paid CCP approximately $7.5 million and $4.6 million, respectively, for equipment rentals, leases and servicing.

MasTec leases employees to a customer in which Jorge Mas and José R. Mas own a minority interest. For both the three month periods ended September 30, 2015 and 2014, MasTec charged approximately $0.2 million to this customer. For the nine month periods ended September 30, 2015 and 2014, MasTec charged approximately $0.6 million and $0.5 million to this customer. As of both September 30, 2015 and December 31, 2014, outstanding receivables from employee leasing arrangements with this customer totaled $0.1 million. The Company also provides satellite communication services to this customer. For the three month periods ended September 30, 2015 and 2014, satellite communication revenue relating to this customer totaled approximately $0.2 million and $0.3 million, respectively. For the nine month periods ended September 30, 2015 and 2014, satellite communication revenues relating to this customer were approximately $0.7 million and $0.8 million, respectively. As of September 30, 2015 and December 31, 2014, outstanding receivables from this customer for satellite communication services totaled approximately $0.3 million and $0.5 million, respectively.

Split Dollar Agreements

MasTec has a split dollar agreement with José R. Mas, which became effective in August 2014 and replaced a prior split dollar and deferred bonus agreement. For the three month period ended September 30, 2015, the Company made no payments in connection with this agreement. For the nine month period ended September 30, 2015, the Company paid $0.7 million in connection with the split dollar agreement. For the three month period ended September 30, 2014, the Company paid approximately $0.7 million in connection with the split dollar agreement for José R. Mas, and for the nine month period ended September 30, 2014 the Company received approximately $0.1 million in proceeds from policies surrendered, net of premiums paid, in connection with the prior split dollar and deferred bonus agreements for José R. Mas. MasTec also has a split dollar agreement with Jorge Mas. The Company paid approximately $0.6 million and $1.1 million in connection with this agreement for the three and nine month periods ended September 30, 2015, respectively, and paid approximately $0.6 million and $1.1 million in connection with this agreement for the three and nine month periods ended September 30, 2014, respectively. As of September 30, 2015 and December 31, 2014, life insurance assets associated with these agreements totaled $13.0 million and $11.1 million respectively, and were included within other long-term assets in the consolidated balance sheets. For additional information regarding the split dollar agreements with José and Jorge Mas, see Note 18 - Related Party Transactions in the notes to the 2014 Form 10-K.

Note 17 – Supplemental Guarantor Condensed Unaudited Consolidating Financial Information

The 4.875% Senior Notes are, and the 2011 Convertible Notes and 2009 Convertible Notes through the dates of their maturity in 2014, were, fully and unconditionally guaranteed on an unsecured, unsubordinated, joint and several basis by certain of the Company’s existing and future 100%-owned direct and indirect domestic subsidiaries that are each guarantors of the Credit Facility or other outstanding indebtedness (the “Guarantor Subsidiaries”). The Company’s subsidiaries organized outside of the United States and certain domestic subsidiaries (collectively, the “Non-Guarantor Subsidiaries”) do not guarantee any of these notes. A Guarantor Subsidiary’s guarantee is subject to release in certain customary circumstances, including upon the sale of a majority of the capital stock or substantially all of the assets of such Guarantor Subsidiary, if the Guarantor Subsidiary’s guarantee under the Company’s Credit Facility and other indebtedness is released or discharged (other than due to payment under such guarantee), or when the requirements for legal defeasance are satisfied or the obligations are discharged in accordance with the related indentures.

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The following supplemental financial information sets forth the condensed unaudited consolidating balance sheets and the condensed unaudited consolidating statements of operations and comprehensive income and cash flows for the parent company (MasTec, Inc.), the Guarantor Subsidiaries on a combined basis, the Non-Guarantor Subsidiaries on a combined basis and the eliminations necessary to arrive at the information for the Company as reported on a consolidated basis. Eliminations represent adjustments to eliminate investments in subsidiaries and intercompany balances and transactions between or among MasTec, Inc., the Guarantor Subsidiaries and the Non-Guarantor Subsidiaries.  Investments in subsidiaries are accounted for using the equity method for this presentation.

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (in millions)

For the Three Months Ended September 30, 2015	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	963.7		$	149.9		$	(2.6	)	$	1,111.0
Costs of revenue, excluding depreciation and amortization	—			841.9			133.4			(2.6		)	972.7
Depreciation and amortization	—			33.2			9.0			—			42.2
General and administrative expenses	0.7			57.0			6.1			—			63.8
Interest expense (income), net	—			27.7			(15.7		)	—			12.0
Other expense, net	—			6.0			0.7			—			6.7
(Loss) income from continuing operations before income taxes	$	(0.7	)	$	(2.1	)	$	16.4		$	—		$	13.6
Benefit from (provision for) income taxes	0.3			1.3			(7.8		)	—			(6.2		)
Net (loss) income from continuing operations	$	(0.4	)	$	(0.8	)	$	8.6		$	—		$	7.4
Equity in income from subsidiaries, net of tax	8.0			—			—			(8.0		)	—
Net income (loss)	$	7.6		$	(0.8	)	$	8.6		$	(8.0	)	$	7.4
Net loss attributable to non-controlling interests	—			—			(0.2		)	—			(0.2		)
Net income (loss) attributable to MasTec, Inc.	$	7.6		$	(0.8	)	$	8.8		$	(8.0	)	$	7.6
Comprehensive (loss) income	$	(5.7	)	$	(0.8	)	$	(4.8	)	$	5.4		$	(5.9	)

For the Three Months Ended September 30, 2014 (As Restated)	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	1,050.5		$	267.0		$	(2.0	)	$	1,315.5
Costs of revenue, excluding depreciation and amortization	—			893.0			231.9			(2.0		)	1,122.9
Depreciation and amortization	—			30.8			10.9			—			41.7
General and administrative expenses	0.6			50.8			8.5			—			59.9
Interest expense, net	—			11.5			1.1			—			12.6
Other (income) expense, net	—			(1.7		)	0.3			—			(1.4		)
(Loss) income from continuing operations before income taxes	$	(0.6	)	$	66.1		$	14.3		$	—		$	79.8
Benefit from (provision for) income taxes	0.2			(24.2		)	(6.4		)	—			(30.3		)
Net (loss) income from continuing operations	$	(0.4	)	$	41.9		$	7.9		$	—		$	49.4
Net loss from discontinued operations	—			—			(0.3		)	—			(0.3		)
Equity in income from subsidiaries, net of tax	49.3			—			—			(49.3		)	—
Net income (loss)	$	48.9		$	41.9		$	7.6		$	(49.3	)	$	49.1
Net income attributable to non-controlling interests	—			—			0.1			—			0.1
Net income (loss) attributable to MasTec, Inc.	$	48.9		$	41.9		$	7.5		$	(49.3	)	$	49.0
Comprehensive income (loss)	$	36.0		$	41.9		$	(5.3	)	$	(36.4	)	$	36.2

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CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (in millions)

For the Nine Months Ended September 30, 2015	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	2,657.9		$	530.2		$	(7.2	)	$	3,180.9
Costs of revenue, excluding depreciation and amortization	—			2,309.4			502.9			(7.2		)	2,805.1
Depreciation and amortization	—			98.1			29.9			—			128.0
General and administrative expenses	1.9			184.9			20.3			—			207.1
Interest expense (income), net	—			82.9			(47.1		)	—			35.8
Other expense, net	—			0.4			4.0			—			4.4
(Loss) income from continuing operations before income taxes	$	(1.9	)	$	(17.8	)	$	20.2		$	—		$	0.5
Benefit from (provision for) income taxes	0.8			7.9			(12.0		)	—			(3.3		)
Net loss (income) from continuing operations	$	(1.1	)	$	(9.9	)	$	8.2		$	—		$	(2.8	)
Equity in loss from subsidiaries, net of tax	(1.3		)	—			—			1.3			—
Net (loss) income	$	(2.4	)	$	(9.9	)	$	8.2		$	1.3		$	(2.8	)
Net loss attributable to non-controlling interests	—			—			(0.5		)	—			(0.5		)
Net (loss) income attributable to MasTec, Inc.	$	(2.4	)	$	(9.9	)	$	8.7		$	1.3		$	(2.3	)
Comprehensive (loss) income	$	(34.4	)	$	(9.9	)	$	(23.7	)	$	33.3		$	(34.8	)

For the Nine Months Ended September 30, 2014 (As Restated)	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	2,802.3		$	580.3		$	(2.1	)	$	3,380.5
Costs of revenue, excluding depreciation and amortization	—			2,402.6			514.4			(2.1		)	2,914.9
Depreciation and amortization	—			88.4			23.6			—			112.0
General and administrative expenses	1.8			146.7			19.0			—			167.5
Interest expense, net	—			35.6			2.0			—			37.6
Other (income) expense, net	—			(5.9		)	0.4			—			(5.5		)
(Loss) income from continuing operations before income taxes	$	(1.8	)	$	134.9		$	20.9		$	—		$	154.0
Benefit from (provision for) income taxes	0.7			(52.0		)	(7.3		)	—			(58.6		)
Net (loss) income from continuing operations	$	(1.1	)	$	82.9		$	13.6		$	—		$	95.4
Net loss from discontinued operations	—			—			(0.5		)	—			(0.5		)
Equity in income from subsidiaries, net of tax	95.9			—			—			(95.9		)	—
Net income (loss)	$	94.8		$	82.9		$	13.1		$	(95.9	)	$	94.9
Net loss attributable to non-controlling interests	—			—			(0.1)			—			(0.1)
Net income (loss) attributable to MasTec, Inc.	$	94.8		$	82.9		$	13.2		$	(95.9	)	$	94.8
Comprehensive income (loss)	$	84.2		$	83.0		$	2.4		$	(85.3	)	$	84.2

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CONDENSED UNAUDITED CONSOLIDATING BALANCE SHEETS (in millions)

As of September 30, 2015	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Current assets	$	—	$	1,007.7	$	230.6	$	—		$	1,238.3
Property and equipment, net	—		464.9		122.1		—			587.0
Goodwill and other intangible assets, net	—		1,055.6		228.0		—			1,283.6
Investments in and advances to consolidated affiliates, net	2,036.4		95.7		1,083.8		(3,215.9		)	—
Other long-term assets	9.3		38.7		88.9		—			136.9
Total assets	$	2,045.7	$	2,662.6	$	1,753.4	$	(3,215.9	)	$	3,245.8
Liabilities and equity
Total current liabilities	$	—	$	666.6	$	120.8	$	—		$	787.4
Long-term debt	—		1,068.1		30.5		—			1,098.6
Other long-term liabilities	—		227.4		107.9		—			335.3
Total liabilities	$	—	$	1,962.1	$	259.2	$	—		$	2,221.3
Total equity	$	2,045.7	$	700.5	$	1,494.2	$	(3,215.9	)	$	1,024.5
Total liabilities and equity	$	2,045.7	$	2,662.6	$	1,753.4	$	(3,215.9	)	$	3,245.8

As of December 31, 2014	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Current assets	$	—	$	1,249.6	$	282.2	$	—		$	1,531.8
Property and equipment, net	—		472.6		150.5		—			623.1
Goodwill and other intangible assets, net	—		1,068.3		264.5		—			1,332.8
Investments in and advances to consolidated affiliates, net	2,108.4		—		1,097.0		(3,205.4		)	—
Other long-term assets	9.3		28.7		38.3		—			76.3
Total assets	$	2,117.7	$	2,819.2	$	1,832.5	$	(3,205.4	)	$	3,564.0
Liabilities and equity
Total current liabilities	$	—	$	777.4	$	203.4	$	—		$	980.8
Long-term debt	—		1,027.3		33.9		—			1,061.2
Advances from consolidated affiliates, net	—		70.7		—		(70.7		)	—
Other long-term liabilities	—		239.3		134.6		—			373.9
Total liabilities	$	—	$	2,114.7	$	371.9	$	(70.7	)	$	2,415.9
Total equity	$	2,117.7	$	704.5	$	1,460.6	$	(3,134.7	)	$	1,148.1
Total liabilities and equity	$	2,117.7	$	2,819.2	$	1,832.5	$	(3,205.4	)	$	3,564.0

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CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF CASH FLOWS (in millions)

For the Nine Months Ended September 30, 2015	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash (used in) provided by operating activities	$	(1.1	)	$	317.0		$	(55.3	)	$	—	$	260.6
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	—			(0.1		)	—			—		(0.1		)
Capital expenditures	—			(58.2		)	(12.6		)	—		(70.8		)
Proceeds from sale of property and equipment	—			8.4			1.4			—		9.8
Payments for investments, net	—			(109.3		)	—			—		(109.3		)
Net cash used in investing activities	$	—		$	(159.2	)	$	(11.2	)	$	—	$	(170.5	)
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	—			827.1			502.5			—		1,329.6
Repayments of credit facilities	—			(747.8		)	(492.3		)	—		(1,240.1		)
Repayments of other borrowings and capital lease obligations	—			(36.4		)	(14.9		)	—		(51.3		)
Repurchase of common stock	(100.0		)	—			—			—		(100.0		)
Proceeds from stock-based awards, net of tax withholdings	2.1			(0.4		)	—			—		1.7
Excess tax benefits from stock-based compensation	—			0.1			—			—		0.1
Payments of acquisition-related contingent consideration	—			(37.3		)	(7.5		)	—		(44.8		)
Payments of financing costs	—			(2.4		)	—			—		(2.4		)
Net financing activities and advances from (to) consolidated affiliates	99.0			(169.2		)	70.2			—		—
Net cash provided by (used in) financing activities	$	1.1		$	(166.3	)	$	58.0		$	—	$	(107.2	)
Effect of currency translation on cash	—			—			0.1			—		0.1
Net decrease in cash and cash equivalents	$	—		$	(8.5	)	$	(8.4	)	$	—	$	(16.9	)
Cash and cash equivalents - beginning of period	—			18.5			5.6			—		24.1
Cash and cash equivalents - end of period	$	—		$	10.0		$	(2.8	)	$	—	$	7.2

For the Nine Months Ended September 30, 2014 (As Restated)	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash (used in) provided by operating activities	$	(0.9	)	$	41.1		$	40.8		$	—	$	81.0
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	—			(40.0		)	(122.9		)	—		(162.9		)
Capital expenditures	—			(75.6		)	(15.4		)	—		(91.0		)
Proceeds from sale of property and equipment	—			10.3			1.9			—		12.2
Payments for investments, net	$	—		$	(1.0	)	$	—		$	—	$	(1.0	)
Net cash used in investing activities	$	—		$	(106.3	)	$	(136.4	)	$	—	$	(242.7	)
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	$	—		$	1,122.4		$	197.2		$	—	$	1,319.6
Repayments of credit facilities	—			(723.2		)	(232.0		)	—		(955.2		)
Repayment of senior convertible notes	—			(105.3		)	—			—		(105.3		)
Repayments of other borrowings and capital lease obligations	—			(45.4		)	(8.7		)	—		(54.1		)
Proceeds from stock-based awards, net of tax withholdings	2.9			(2.6		)	—			—		0.3
Excess tax benefits from stock-based compensation	—			3.5			—			—		3.5
Payments of acquisition-related contingent consideration	—			(60.3		)	—			—		(60.3		)
Payments of financing costs	—			(1.5		)	—			—		(1.5		)
Net financing activities and advances (to) from consolidated affiliates	(2.0		)	(125.2		)	127.2			—		—
Net cash provided by financing activities	$	0.9		$	62.4		$	83.7		$	—	$	147.0
Effect of currency translation on cash	—			—			(1.2		)	—		(1.2		)
Net decrease in cash and cash equivalents	$	—		$	(2.8	)	$	(13.1	)	$	—	$	(15.9	)
Cash and cash equivalents - beginning of period	—			5.4			17.6			—		22.9
Cash and cash equivalents - end of period	$	—		$	2.6		$	4.5		$	—	$	7.1

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CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

This report contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are not historical facts but are the intent, belief, or current expectations of our business and industry and the assumptions upon which these statements are based. While management believes that these forward-looking statements are reasonable as and when made, there can be no assurance that future developments affecting us will be those that we anticipate. All comments concerning our expectations for future revenues and operating results are based on our forecasts for our existing operations and do not include the potential impact of any future acquisitions or dispositions. Words such as “anticipates,” “expects,” “intends,” “will,” “could,” “would,” “should,” “may,” “plans,” “believes,” “seeks,” “estimates” and variations of these words and negatives thereof and similar expressions are intended to identify forward-looking statements. These statements are not guarantees of future performance and are subject to risks, uncertainties, and other factors, some of which are beyond our control, are difficult to predict, and could cause actual results to differ materially from those expressed or forecasted in the forward-looking statements.

These risks and uncertainties include those described in “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and elsewhere in this report and in our 2014 Form 10-K, including those described under “Cautionary Statement Regarding Forward-Looking Statements” and “Risk Factors” in the 2014 Form 10-K, as updated by Item 1A, “Risk Factors” in this report and other filings we make with the SEC. Forward-looking statements that were true at the time made may ultimately prove to be incorrect or false. Readers are cautioned to not place undue reliance on forward-looking statements, which reflect management’s view only as of the date of this report. We undertake no obligation to update or revise forward-looking statements to reflect changed assumptions, the occurrence of unanticipated events or changes to future operating results.

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following is a discussion of our business, financial position and results of operations as of and for the three and nine month periods ended September 30, 2015 and 2014. This discussion and analysis should be read in conjunction with the audited consolidated financial statements, accompanying notes and Management’s Discussion and Analysis of Financial Condition and Results of Operations (“MD&A”) contained in the 2014 Form 10-K. In this MD&A, “$” means U.S. dollars unless specified otherwise.

Restatement of Previously Reported Condensed Unaudited Consolidated Financial Statements

As disclosed in the 2014 Form 10-K, we restated our condensed unaudited consolidated financial statements for the three and nine month periods ended September 30, 2014 and presented these restated results in Note 2 - Independent Investigation of the Audit Committee and Related Restatements in our 2014 Form 10-K. The condensed unaudited consolidated financial statements, along with the related notes thereto as of and for the three and nine month periods ended September 30, 2014, reflect these restatements. The restatement adjustments had the following effects on the 2014 periods:

• An increase in revenue of $5.9 million and $2.4 million for the three and nine month periods ended September 30, 2014, respectively, associated with changes in cost-to-complete estimates on projects accounted for under the percentage-of-completion method, primarily in the Electrical Transmission segment;

• Immaterial adjustments in costs of revenues, excluding depreciation and amortization, for the three and nine month periods ended September 30, 2014;

• An increase in income tax expense of $2.3 million and $0.9 million for the three and nine month periods ended September 30, 2014, respectively, representing the tax effects of the adjustments;

• An increase in net income from continuing operations of $3.7 million and $1.5 million for the three and nine month periods ended September 30, 2014, respectively; and

• An increase in basic earnings per share from continuing operations of $0.04, an increase in total basic earnings per share of $0.05, and an increase in diluted earnings per share of $0.04 for the three month period ended September 30, 2014. Basic, total basic and diluted earnings per share each increased by $0.02 for the nine month period ended September 30, 2014.

In addition, there were the following balance sheet effects:

• a reclassification adjustment associated with cost-to-complete estimates that decreased costs and earnings in excess of billings and other current liabilities by $5.3 million, partially offset by an increase in costs and earnings in excess of billings of $1.1 million from other cost-to-complete estimate changes, primarily in the Electrical Transmission segment, for a net decrease in cost in excess of billings and earnings of $4.2 million as of September 30, 2014;

• a decrease in billings in excess of costs and earnings of $1.3 million; and

• an increase in current taxes payable of $0.9 million, as well as other immaterial adjustments within various segments.

Business Overview

We are a leading infrastructure construction company operating mainly throughout North America across a range of industries. Our primary activities include the engineering, building, installation, maintenance and upgrade of communications, energy and utility infrastructure, such as: wireless, wireline/fiber and satellite communications; petroleum and natural gas pipeline infrastructure; electrical utility transmission and distribution; power generation; and industrial infrastructure. Our customers are primarily in these industries. Including our predecessor companies, we have been in business for more than 85 years. We offer our services primarily under the MasTec service mark and, as of September 30, 2015, we had approximately 17,500 employees and 490 locations. We have been consistently ranked among the top specialty contractors by Engineering News-Record for the past several years.

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We provide our services to a diversified base of customers. We often provide services under master service and other service agreements, which are generally multi-year agreements. The remainder of our work is generated pursuant to contracts for specific projects or jobs that require the construction or installation of an entire infrastructure system or specified units within an infrastructure system. Revenue from non-recurring, project specific work may experience greater variability than master service agreement work due to the need to replace the revenue as projects are completed. If we are not able to replace work from completed projects with new project work, we may not be able to maintain our current revenue levels or our current level of capacity and resource utilization. We actively review our backlog of project work and take appropriate action to minimize such exposure.

We manage our continuing operations under five operating segments, which represent our five reportable segments: (1) Communications; (2) Oil and Gas; (3) Electrical Transmission; (4) Power Generation and Industrial and (5) Other. This structure is generally focused on broad end-user markets for our labor-based construction services. Throughout this report, segment information for prior periods has been updated to conform to the current period presentation. See Note 16 - Segments and Related Information in the Company’s 2014 Form 10-K for additional details.

The Communications segment performs engineering, construction and maintenance of communications infrastructure primarily related to wireless and wireline/fiber communications and install-to-the-home customers. We perform engineering, construction and maintenance services on oil and natural gas pipelines and processing facilities for the energy and utilities industries through the Oil and Gas segment. The Electrical Transmission segment primarily serves the energy and utility industries through the engineering, construction and maintenance of electrical transmission lines and substations. The Power Generation and Industrial segment primarily serves energy, utility and other end-markets through the installation and construction of conventional and renewable power facilities, related electrical transmission infrastructure, ethanol facilities and various types of industrial infrastructure. The Other segment primarily includes a proportionately consolidated joint venture and other small business units that perform construction services for a variety of end-markets in Canada, Mexico and elsewhere internationally.

See Note 14 - Segments and Related Information and Note 15 - Commitments and Contingencies in the notes to the condensed unaudited consolidated financial statements, which are incorporated by reference, for details pertaining to segment classifications, as well as operating results by segment and for significant customer concentrations.

Backlog

Estimated backlog represents the amount of revenue we expect to realize over the next 18 months from future work on uncompleted contracts, including new contractual agreements on which work has not begun, as well as revenue from change orders and renewal options. Our estimated backlog includes amounts under master service and other service agreements in addition to construction projects and includes our proportionate share of estimated revenue attributable to a contractual joint venture that we proportionately consolidate. We determine the amount of backlog for work under master service and other service agreements based on historical trends, anticipated seasonal impacts and estimates of customer demand based on communications with our customers. The following table presents 18-month backlog by reportable segment, as of the dates indicated, which has been updated to conform to the current period presentation.

	September 30, 2015		June 30, 2015		September 30, 2014
Reportable Segment (in millions):					As Restated
Communications	$	3,082	$	2,895	$	2,830
Oil and Gas	933		708		744
Electrical Transmission	265		188		353
Power Generation and Industrial	269		259		168
Other	13		20		43
Estimated 18-month backlog	$	4,562	$	4,070	$	4,138

We expect to realize approximately 20% of our September 30, 2015 backlog in 2015. Our backlog estimates include amounts under master service agreements, pursuant to which our customers are not contractually committed to purchase a minimum amount of services; and most of these agreements can be canceled on short or no advance notice. Approximately 60% of our estimated backlog as of September 30, 2015 represented amounts under master service or other service agreements. In the past, we have experienced a combination of cancellations and reductions in expected future work from master service agreements as a result of changes in current and planned wireless customer spending, as well as cancellations and deferrals of oil and gas projects due to volatility in the oil markets. There can be no assurance as to our customers’ requirements or that our estimates are accurate. In addition, timing of revenue for construction and installation projects included in our backlog can be subject to change as a result of customer delays, regulatory requirements and other project related factors. These changes could cause estimated revenue to be realized in periods later than originally expected, or not at all. As a result, our backlog as of any particular date is an uncertain indicator of future revenue and earnings.

Backlog is not a term recognized under U.S. GAAP; however, it is a common measurement used in our industry. Our methodology for determining backlog may not be comparable to the methodologies used by others.

Economic, Industry and Market Factors

We closely monitor the effects that changes in economic and market conditions may have on our customers. General economic and market conditions can negatively affect demand for our customers’ products and services, which can lead to rationalization of our customers’ capital and maintenance budgets in certain end-markets. Fluctuations in market prices for oil, gas and other fuel sources can affect demand for our services, in particular, pipeline and power generation construction services. These fluctuations, as well as the highly competitive nature of our industry, particularly

33

when work is deferred, can result, and in recent years, has resulted in lower bids and lower profit on the services we provide. In the face of increased pricing pressure, we strive to maintain our profit margins through productivity improvements and cost reduction programs. Other market and industry factors, such as (i) changes to our customers’ capital spending plans; (ii) mergers and acquisitions among the customers we serve, such as the July 2015 acquisition of DIRECTV^® by AT&T; (iii) access to capital for customers in the industries we serve; (iv) changes in technology, tax and other incentives; (v) renewable energy portfolio standards; and (vi) new or changing regulatory requirements affecting the industries we serve, can also affect demand for our services. While we actively monitor economic, industry and market factors affecting our business, we cannot predict the impact such factors may have on our future results of operations, liquidity and cash flows and we may be unable to fully mitigate or take advantage of changes in these factors.

Impact of Seasonality and Cyclical Nature of Business

Our revenue and results of operations can be subject to seasonal and other variations. These variations are influenced by weather, customer spending patterns, bidding seasons, project schedules and timing, in particular, for large non-recurring projects and holidays. Typically, our revenue is lowest in the first quarter of the year because cold, snowy or wet conditions cause project delays. Revenue in the second quarter is typically higher than in the first quarter, as some projects begin, but continued cold and wet weather can often impact second quarter productivity. The third and fourth quarters are typically the most productive quarters of the year, as a greater number of projects are underway and weather is normally more accommodating to construction projects. In the fourth quarter, many projects tend to be completed by customers seeking to spend their capital budgets before the end of the year, which generally has a positive impact on our revenue. However, the holiday season and inclement weather can cause delays, which can reduce revenue and increase costs on affected projects. Any quarter may be positively or negatively affected by adverse or unusual weather patterns, such as excessive rainfall or warm winter weather, making it difficult to predict quarterly revenue and margin variations.

Additionally, our industry can be highly cyclical. Fluctuations in end-user demand within the industries we serve, or in the supply of services within those industries, can impact demand for our services. As a result, our business may be adversely affected by industry declines or by delays in new projects. Variations in project schedules or unanticipated changes in project schedules, in particular, in connection with large construction and installation projects, can create fluctuations in revenue, which may adversely affect us in a given period, even if not in total. In addition, revenue from master service agreements, while generally predictable, can be subject to volatility. The financial condition of our customers and their access to capital; variations in project margins; regional, national and global economic and market conditions; regulatory or environmental influences; and acquisitions, dispositions or strategic investments can also materially affect quarterly results. Accordingly, our operating results in any particular period may not be indicative of the results that can be expected for any other period.

Critical Accounting Estimates

This discussion and analysis of our financial condition and results of operations is based upon our condensed unaudited consolidated financial statements, which have been prepared in accordance with U.S. GAAP. The preparation of these condensed unaudited consolidated financial statements requires the use of estimates and assumptions that affect the amounts reported in our condensed unaudited consolidated financial statements and the accompanying notes. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances, the results of which form the basis of making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Given that management estimates, by their nature, involve judgments regarding future uncertainties, actual results may differ from these estimates if conditions change or if certain key assumptions used in making these estimates ultimately prove to be inaccurate. Our accounting policies and critical accounting estimates are reviewed periodically by the Audit Committee of the Board of Directors. Refer to Note 1 - Business, Basis of Presentation and Significant Accounting Policies in the notes to our condensed unaudited consolidated financial statements, which is incorporated by reference, and to our 2014 Form 10-K for discussion of our significant accounting policies.

We believe that our accounting estimates pertaining to revenue and cost recognition from percentage-of-completion projects, including related project profit or loss; allowances for doubtful accounts; fair value estimates in connection with business acquisitions, in particular, estimated values of net assets acquired and estimated liabilities for future earn-out obligations; valuations of goodwill and indefinite-lived intangible assets; income taxes; self-insurance liabilities; and litigation and other contingencies are the most critical in the preparation of our consolidated financial statements as they are important to the portrayal of our financial condition and require significant or complex judgment and estimates on the part of management.

Results of Operations

Comparison of Quarterly Results

The following table reflects our consolidated results of operations in dollar and percentage of revenue terms for the periods indicated (dollar amounts in millions). Our consolidated results of operations are not necessarily comparable from period to period due to the impact of recent acquisitions and the impact of certain other items, which are described more fully in the comparison of results section below.

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	For the Three Months Ended September 30,										For the Nine Months Ended September 30,
	2015					2014					2015					2014
						As Restated										As Restated
Revenue	$	1,111.0		100.0	%	$	1,315.5		100.0	%	$	3,180.9		100.0	%	$	3,380.5		100.0	%
Costs of revenue, excluding depreciation and amortization	972.7			87.6	%	1,122.9			85.4	%	2,805.1			88.2	%	2,914.9			86.2	%
Depreciation and amortization	42.2			3.8	%	41.7			3.2	%	128.0			4.0	%	112.0			3.3	%
General and administrative expenses	63.8			5.7	%	59.9			4.6	%	207.1			6.5	%	167.5			5.0	%
Interest expense, net	12.0			1.1	%	12.6			1.0	%	35.8			1.1	%	37.6			1.1	%
Other expense (income), net	6.7			0.6	%	(1.4		)	(0.1	)%	4.4			0.1	%	(5.5		)	(0.2	)%
Income from continuing operations before income taxes	$	13.6		1.2	%	$	79.8		6.1	%	$	0.5		0.0	%	$	154.0		4.6	%
Provision for income taxes	(6.2		)	(0.6	)%	(30.3		)	(2.3	)%	(3.3		)	(0.1	)%	(58.6		)	(1.7	)%
Net income (loss) from continuing operations	$	7.4		0.7	%	$	49.4		3.8	%	$	(2.8	)	(0.1	)%	$	95.4		2.8	%
Net loss from discontinued operations	—			—	%	(0.3		)	(0.0	)%	—			—	%	(0.5		)	(0.0	)%
Net income (loss)	$	7.4		0.7	%	$	49.1		3.7	%	$	(2.8	)	(0.1	)%	$	94.9		2.8	%
Net (loss) income attributable to non-controlling interests	(0.2		)	(0.0	)%	0.1			0.0	%	(0.5		)	(0.0	)%	0.1			0.0	%
Net income (loss) attributable to MasTec, Inc.	$	7.6		0.7	%	$	49.0		3.7	%	$	(2.3	)	(0.1	)%	$	94.8		2.8	%

We review our operating results by reportable segment. See Note 14 - Segments and Related Information in the notes to the condensed unaudited consolidated financial statements, which is incorporated by reference. Our reportable segments are: (1) Communications; (2) Oil and Gas; (3) Electrical Transmission; (4) Power Generation and Industrial and (5) Other. Management’s review of reportable segment results includes analyses of trends in revenue, EBITDA and EBITDA margin. We calculate EBITDA for segment reporting purposes consistently with our consolidated EBITDA calculation. See discussion of non-U.S. GAAP financial measures following the comparison of results discussion below. The following table, which has been updated for prior periods to conform to the current period presentation, presents revenue, EBITDA and EBITDA margin by reportable segment for our continuing operations for the periods indicated (dollar amounts in millions):

	Revenue												EBITDA and EBITDA Margin
	For the Three Months Ended September 30,						For the Nine Months Ended September 30,						For the Three Months Ended September 30,										For the Nine Months Ended September 30,
	2015			2014			2015			2014			2015					2014					2015					2014
Reportable Segment:				As Restated						As Restated								As Restated										As Restated
Communications	$	513.3		$	505.2		$	1,452.1		$	1,480.4		$	49.7		9.7	%	$	52.5		10.4	%	$	141.8		9.8	%	$	153.7		10.4	%
Oil and Gas	406.9			554.4			1,144.2			1,299.3			51.0			12.5	%	73.4			13.2	%	113.9			10.0	%	144.2			11.1	%
Electrical Transmission	75.9			138.4			270.2			329.1			(23.7		)	(31.2	)%	18.5			13.4	%	(47.6		)	(17.6	)%	35.1			10.7	%
Power Generation and Industrial	115.0			114.3			302.3			263.1			4.8			4.2	%	4.9			4.3	%	3.9			1.3	%	9.4			3.6	%
Other	3.8			4.1			17.2			10.6			(2.0		)	(51.9	)%	(0.7		)	(16.9	)%	(7.1		)	(41.2	)%	(0.1		)	(1.1	)%
Eliminations	(3.9		)	(0.9		)	(5.1		)	(2.0		)	—			—		—			—		—			—		—			—
Corporate	—			—			—			—			(12.0		)	NA		(14.4		)	NA		(40.5		)	NA		(38.7		)	NA
Consolidated Results	$	1,111.0		$	1,315.5		$	3,180.9		$	3,380.5		$	67.8		6.1	%	$	134.2		10.2	%	$	164.4		5.2	%	$	303.6		9.0	%

The following discussion and analysis of our results of operations should be read in conjunction with our condensed unaudited consolidated financial statements and notes thereto in Item 1 of this Quarterly Report on Form 10-Q.

Three Months Ended September 30, 2015 Compared to Three Months Ended September 30, 2014

Revenue. Consolidated revenue decreased to $1,111 million from $1,315 million, a decrease of approximately $204 million, or 16%, for the three month period ended September 30, 2015 as compared with the same period in 2014. Oil and Gas revenue decreased by $148 million, or 27%, and Electrical Transmission revenue decreased by $62 million, or 45%, whereas Communications revenue increased by $8 million, or 2%, and Power Generation and Industrial revenue increased by $1 million, or 1%. Acquisitions contributed approximately $69 million of third quarter 2015 revenue, while organic revenue declined by $274 million as compared with the same period in the prior year. In addition to the decreases in Oil and Gas and Electrical Transmission, organic revenue in our Communications segment decreased due to lower levels of wireless services. A discussion of revenue by segment follows below.

Communications Segment. Communications revenue was $513 million for the three month period ended September 30, 2015, as compared with $505 million for the same period in 2014, an increase of $8 million, or 2%. Acquisitions contributed approximately $69 million of revenue, whereas organic revenue decreased by $61 million as compared with the same period in the prior year, primarily as a result of lower levels of wireless services due to changes in our wireless customers’ capital spending plans, partially offset by an increase in revenue from certain utility services.

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Oil and Gas Segment. Oil and Gas revenue was $407 million for three month period ended September 30, 2015, as compared with $554 million for the same period in 2014, a decrease of $148 million, or 27%. The decrease was due to completion of a large long-haul pipeline project in 2014 for which there was no replacement project in 2015, lower levels of pipeline activity from delays in project timing, including the effect of project deferrals in our Canadian operations as a result of the decline in oil prices, coupled with the negative effect of fluctuations in foreign currency exchange rates.

Electrical Transmission Segment. Electrical Transmission revenue was $76 million for the three month period ended September 30, 2015, as compared with $138 million for the same period in 2014, a decrease of $62 million, or 45%, due to reduced project activity from the combination of lower overall market activity levels resulting from project delays and lower than expected success rates on new project awards during 2015 due to management diversion from business operations and marketing as a result of the Audit Committee independent investigation.

Power Generation and Industrial Segment. Power Generation and Industrial revenue was $115 million for the three month period ended September 30, 2015, as compared with $114 million for the same period in 2014, an increase of $1 million.

Other Segment. Other segment revenue totaled approximately $4 million for both the three month periods ended September 30, 2015 and 2014.

Costs of revenue, excluding depreciation and amortization. Costs of revenue, excluding depreciation and amortization, decreased by $150 million, or 13%, to $973 million for the three month period ended September 30, 2015 as compared with $1,123 million for the same period in 2014. Lower revenue contributed a $175 million decrease in costs of revenue, excluding depreciation and amortization, whereas decreased productivity resulted in an increase of approximately $24 million. Costs of revenue, excluding depreciation and amortization, as a percentage of revenue increased by approximately 220 basis points, from 85.4% of revenue for the three month period ended September 30, 2014, to 87.6% of revenue for the same period in 2015. The basis point increase was driven primarily by increased costs in (i) our Electrical Transmission segment due to the effects of site-related project inefficiencies and lower levels of cost utilization from reduced levels of revenue, and (ii) our Other segment due to losses from continued project delays on a proportionately consolidated non-controlled Canadian joint venture that was acquired in 2014.

Depreciation and amortization. Depreciation and amortization was $42 million, or 3.8% of revenue for the three month period ended September 30, 2015 as compared with $42 million, or 3.2% of revenue in 2014. Acquisitions contributed $3 million of depreciation and amortization expense, whereas organic depreciation and amortization expense decreased by $3 million as compared with the same period in prior year.

General and administrative expenses. General and administrative expenses were $64 million, or 5.7% of revenue for the three month period ended September 30, 2015, as compared with $60 million, or 4.6% of revenue for the same period in 2014, an increase of approximately $4 million, or 7%. Acquisition integration costs and Audit Committee independent investigation expenses contributed $1 million and $4 million, respectively, to general and administrative expenses in the third quarter of 2015. Other increases in general and administrative expenses for the three month period ended September 30, 2015, as compared with the same period in the prior year, included increases in legal costs and bad debt expense. These increases were offset by decreases in stock-based and incentive compensation expense for the three month period ended September 30, 2015 as compared with the same period in the prior year.

Interest expense, net. Interest expense, net of interest income, was $12 million, or 1.1% of revenue for the three month period ended September 30, 2015 as compared with $13 million, or 1.0% of revenue, in 2014. In 2014, our senior convertible notes matured and were converted, which reduced our interest expense in 2015. The decrease in interest expense in 2015 from our senior convertible notes was partially offset by incremental interest expense on our credit facilities as a result of higher average outstanding borrowings in the third quarter of 2015, as well as from discount fees associated with financing arrangements.

Other expense (income), net. For the three month period ended September 30, 2015 and 2014, other expense, net, was $7 million, whereas for the three month period ended September 30, 2014, other income was $1 million. Other expense (income), net, consists primarily of gains or losses from sales of assets and investments, certain legal/other settlements, income or expense from equity method investments and gains or losses from changes to estimated earn-out accruals. For the three month period ended September 30, 2015, we recorded a $12 million charge related to a court mandated mediation settlement, which was offset, in part, by approximately $4 million of a net reduction in the estimated earn-out liability for acquired businesses. For both the three month periods ended September 30, 2015 and 2014, gains on sales of equipment were approximately $1 million.

Provision for income taxes. Income tax expense was $6 million for the three month period ended September 30, 2015, as compared with $30 million for the same period in the prior year. In the third quarter of 2015, we had pre-tax income of $14 million as compared with pre-tax income of $80 million for the same period in the prior year. Our effective tax rate for the three month period ended September 30, 2015increased versus the same period in 2014 due to the impact of lower international earnings, coupled with the impact of permanent differences in relationship to our consolidated earnings for each period.

Analysis of EBITDA by Segment

Communications Segment. EBITDA for our Communications segment was $50 million, or 9.7% of revenue, for the three month period ended September 30, 2015 as compared with $52 million, or 10.4% of revenue, for the same period in 2014, a $3 million, or 5%decrease. Communications segment EBITDA for the three month period ended September 30, 2015 includes approximately $1 million of acquisition integration costs associated with the WesTower acquisition. As a percentage of revenue, EBITDA decreased by 70 basis points, or approximately $4 million, primarily as a result of integration costs from the Westower acquisition and lower levels of cost utilization due to reduced levels of wireless revenue.

Oil and Gas Segment. EBITDA for our Oil and Gas segment was $51 million, or 12.5% of revenue, for the three month period ended September 30, 2015 as compared with $73 million, or 13.2% of revenue, for the same period in 2014, a decrease of $22 million, or 30%. As a percentage of revenue, Oil and Gas segment EBITDA decreased by approximately 70 basis points, or approximately $3 million, due to production inefficiencies

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resulting from lower levels of revenue due to completion of a large long-haul pipeline project in 2014 for which there was no replacement project in 2015, lower levels of pipeline activity from delays in project timing, including the effect of project deferrals in our Canadian operations as a result of the decline in oil prices, coupled with the negative effect of fluctuations in foreign currency exchange rates on our Canadian operations as compared with the same period in the prior year.

Electrical Transmission Segment. EBITDA for our Electrical Transmission segment was negative $24 million, or negative 31.2% of revenue, for the three month period ended September 30, 2015 as compared with positive EBITDA of $19 million, or positive 13.4% of revenue, for the same period in 2014, a decrease in EBITDA of $42 million. In the third quarter of 2015, our Electrical Transmission segment recorded a $12 million charge related to a settlement reached during a court mandated mediation. Electrical Transmission segment EBITDA has also been negatively affected by lower levels of cost utilization from reduced levels of revenue as compared with the same period in the prior year, as well as from site-related project inefficiencies and higher legal costs. This segment has been the primary focus of the Audit Committee independent investigation, which has significantly diverted management’s attention from its operations and marketing efforts.

Power Generation and Industrial Segment. EBITDA for our Power Generation and Industrial segment was generally flat at $4.8 million, or 4.2% of revenue, for the three month period ended September 30, 2015, as compared with $4.9 million, or 4.3% of revenue, for the same period in 2014. As a percentage of revenue, Power Generation and Industrial segment EBITDA decreased by approximately 10 basis points. For the three month period ended September 30, 2015, Power Generation and Industrial segment EBITDA includes $3.8 million of losses on a troubled wind project, partially offset by project efficiencies and improved cost utilization from higher levels of revenue.

Other Segment. EBITDA from Other businesses was negative $2 million for the three month period ended September 30, 2015, as compared with negative EBITDA of $1 million for the same period in 2014. For the three month period ended September 30, 2015, Other segment EBITDA includes $3 million of losses on a proportionately consolidated non-controlled Canadian joint venture that was acquired in 2014 and experienced project delays.

Corporate. Corporate EBITDA was negative $12 million for the three month period ended September 30, 2015, as compared with negative EBITDA of $14 million for the same period in 2014. For the three month period ended September 30, 2015, Corporate EBITDA includes $4 million of costs related to the Audit Committee independent investigation. The increase in Corporate EBITDA from Audit Committee independent investigation costs was offset by a net reduction in the estimated earn-out liability for acquired businesses and a decrease in stock-based and incentive compensation expense.

Nine Months Ended September 30, 2015 Compared to Nine Months Ended September 30, 2014

Revenue. Consolidated revenue decreased to $3,181 million from $3,381 million, a decrease of approximately $200 million, or 6%, for the nine month period ended September 30, 2015 as compared with the same period in 2014. Oil and Gas revenue decreased by $155 million, or 12%, Electrical Transmission revenue decreased by $59 million, or 18%, and Communications revenue decreased by $28 million, or 2%. These decreases were partially offset by increases in Power Generation and Industrial revenue of $39 million, or 15%, and Other segment revenue of $7 million, or 63%. Acquisitions contributed approximately $302 million of revenue, while organic revenue declined by $501 million as compared with the same period in the prior year. In addition to the decreases in Oil and Gas and Electrical Transmission, organic revenue in our Communications segment decreased due to lower levels of wireless services. A discussion of revenue by segment follows below.

Communications Segment. Communications revenue was $1,452 million for the nine month period ended September 30, 2015, as compared with $1,480 million for the same period in 2014, a decrease of $28 million, or 2%. Acquisitions contributed approximately $209 million of revenue, whereas organic revenue declined by $237 million as compared with the same period in the prior year, primarily as a result of lower levels of wireless services due to changes in our wireless customers’ capital spending plans as well as the effect of adverse weather disruptions. The decrease in wireless revenue was partially offset by an increase in revenue from certain utility services.

Oil and Gas Segment. Oil and Gas revenue was $1,144 million for nine month period ended September 30, 2015, as compared with $1,299 million for the same period in 2014, a decrease of $155 million, or 12%. Acquisitions contributed $89 million of revenue, while organic revenue declined by $244 million as compared with the same period in the prior year. The decline in organic revenue resulted from completion of a large long-haul pipeline project in 2014, for which there was no replacement project in 2015, lower levels of pipeline activity from delays in project timing, including the effect of project deferrals in our Canadian operations as a result of the decline in oil prices, coupled with the negative effect of fluctuations in foreign currency exchange rates.

Electrical Transmission Segment. Electrical Transmission revenue was $270 million for the nine month period ended September 30, 2015, as compared with $329 million for the same period in 2014, a decrease of $59 million, or 18%. Electrical transmission revenue for the nine month period ended September 30, 2015 included the effect of adverse weather disruptions and site-related project inefficiencies as well as reduced project activity from the combination of lower overall market activity levels resulting from project delays and lower than expected success rates on new project awards during 2015 due to management diversion from business operations and marketing as a result of the Audit Committee independent investigation.

Power Generation and Industrial Segment. Power Generation and Industrial revenue was $302 million for the nine month period ended September 30, 2015, as compared with $263 million for the same period in 2014, an increase of $39 million, or 15%. The increase was driven by higher levels of renewable power projects as compared with the same period in the prior year.

Other Segment. Other segment revenue totaled approximately $17 million for the nine month period ended September 30, 2015 as compared with $11 million for the same period in 2014, an increase of $7 million, driven by increased oil and gas operations in Mexico, as well as an increase in revenue from a proportionately consolidated non-controlled Canadian joint venture that was acquired in 2014.

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Costs of revenue, excluding depreciation and amortization. Costs of revenue, excluding depreciation and amortization, decreased by $110 million, or 4%, to $2,805 million for the nine month period ended September 30, 2015 from $2,915 million for the same period in 2014. Lower revenue contributed a $172 milliondecrease in costs of revenue, excluding depreciation and amortization, whereas decreased productivity resulted in an increase of $62 million. Costs of revenue, excluding depreciation and amortization, as a percentage of revenue increased by approximately 200 basis points, from 86.2% of revenue for the nine month period ended September 30, 2014, to 88.2% of revenue for the same period in 2015. The basis point increase was primarily driven by increased costs in our Electrical Transmission, Power Generation and Industrial and Other segments. The primary driver of the basis point increase was due to increased costs in our Electrical Transmission segment due to the effects of adverse weather disruptions, site-related project inefficiencies and lower levels of cost utilization from reduced levels of revenue. Costs of revenue, excluding depreciation and amortization, as a percentage of revenue for the nine month period ended September 30, 2015 also increased in our Power Generation and Industrial segment due to project losses of approximately $21 million for the nine month period ended September 30, 2015 on a troubled wind project in Canada, and in our Other business segment from project losses of approximately $8 million on a non-controlled Canadian joint venture. These increases in costs of revenue, excluding depreciation and amortization, as a percent of revenue, were partially offset by productivity improvements in our Communications segment.

Depreciation and amortization. Depreciation and amortization was $128 million, or 4.0% of revenue for the nine month period ended September 30, 2015 as compared with $112 million, or 3.3% of revenue for the same period in 2014, an increase of approximately $16 million, or 14%. Acquisitions contributed $18 million of depreciation and amortization expense, whereas organic depreciation and amortization expense decreased by $2 million as compared with the same period in prior year.

General and administrative expenses. General and administrative expenses were $207 million, or 6.5% of revenue for the nine month period ended September 30, 2015, as compared with $167 million, or 5.0% of revenue for the same period in 2014, an increase of approximately $40 million, or 24%. Acquisitions contributed approximately $6 million of incremental general and administrative costs, exclusive of acquisition integration costs associated with the WesTower acquisition. Acquisition integration costs and Audit Committee independent investigation expenses contributed $18 million and $14 million, respectively, of the increase in general and administrative expenses for the nine month period ended September 30, 2015. Other increases in general and administrative expenses for the nine month period ended September 30, 2015, as compared with the same period in the prior year, included increases in legal costs and bad debt expense, partially offset by decreases in stock-based and incentive compensation expense.

Interest expense, net. Interest expense, net of interest income, was $36 million, or 1.1% of revenue for the nine month period ended September 30, 2015, as compared with $38 million, or 1.1% of revenue for the same period in 2014. In 2014, our senior convertible notes matured and were converted, which reduced our interest expense in 2015. The decrease in interest expense in 2015 from our senior convertible notes was partially offset by incremental interest expense on our credit facilities as a result of higher average outstanding borrowings, as well as from discount fees associated with financing arrangements and consent solicitation agent fees due to the delay in filing of our 2014 Form 10-K and the First Quarter Form 10-Q.

Other expense (income), net. Other expense, net, was $4 million for the nine month period ended September 30, 2015, as compared with $5 million of other income for the same period in 2014. Other expense (income), net, consists primarily of gains or losses from sales of assets and investments, certain legal/other settlements, income or expense from equity method investments and gains or losses from changes to estimated earn-out accruals. Other expense, net, for the nine month period ended September 30, 2015 includes a $12 million charge related to a court mandated mediation settlement and approximately $4 million of losses on equity method investments, offset, in part, by $8 million of a net reduction in the estimated earn-out liability for acquired businesses, offset. Gains on sales of equipment for the nine month periods ended September 30, 2015 and 2014 were approximately $3 million and $4 million, respectively.

Provision for income taxes. Income tax expense was $3 million for the nine month period ended September 30, 2015, as compared with income tax expense of $59 million for the same period in 2014. Pre-tax income for the nine month period ended September 30, 2015 was $1 million as compared with pre-tax income of $154 million for the same period in the prior year. Income tax expense for the nine month period ended September 30, 2015 includes the effect of approximately $3 million incurred in connection with the cumulative revaluation of certain deferred tax liabilities pursuant to an Alberta provincial income tax law that was enacted as of June 29, 2015. Our effective tax rate for the nine month period ended September 30, 2015increased versus the same period in 2014 due to the impact of lower international earnings, coupled with the impact of permanent differences in relationship to our consolidated earnings for each period.

Analysis of EBITDA by Segment

Communications Segment. EBITDA for our Communications segment was $142 million, or 9.8% of revenue, for the nine month period ended September 30, 2015 as compared with $154 million, or 10.4% of revenue, for the same period in 2014, a $12 million, or 8% decrease. Communications segment EBITDA for the nine month period ended September 30, 2015 includes approximately $18 million of acquisition integration costs associated with the WesTower acquisition. As a percentage of revenue, EBITDA decreased by 60 basis points, or approximately $9 million, primarily as a result of acquisition integration costs from the WesTower acquisition, offset in part by production efficiencies and improved cost utilization.

Oil and Gas Segment. EBITDA for our Oil and Gas segment was $114 million, or 10.0% of revenue, for the nine month period ended September 30, 2015 as compared with $144 million, or 11.1% of revenue, for the same period in 2014, a decrease of $30 million, or 21%. As a percentage of revenue, Oil and Gas segment EBITDA decreased by approximately 110 basis points, or approximately $13 million, due to production inefficiencies resulting from lower levels of revenue due to completion of a large long-haul pipeline project in 2014 for which there was not a replacement project in 2015, lower levels of pipeline activity from delays in project timing, including the effect of project deferrals in our Canadian operations as a result of the decline in oil prices, coupled with the negative effect of fluctuations in foreign currency exchange rates on our Canadian operations as compared with the same period in the prior year.

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Electrical Transmission Segment. EBITDA for our Electrical Transmission segment was negative $48 million for the nine month period ended September 30, 2015, or negative 17.6% of revenue, as compared with positive EBITDA of $35 million, or positive 10.7% of revenue, for the same period in 2014, a decrease in EBITDA of $83 million. In the third quarter of 2015, our Electrical Transmission segment recorded a $12 million charge related to a settlement reached during a court mandated mediation. Electrical Transmission segment EBITDA has also been negatively affected by lower levels of cost utilization from reduced levels of revenue as compared with the same period in the prior year, as well as the effects of adverse weather disruptions, site-related project inefficiencies and higher legal costs. This segment has been the primary focus of the Audit Committee independent investigation, which has significantly diverted management’s attention from its operations and marketing efforts.

Power Generation and Industrial Segment. EBITDA for our Power Generation and Industrial segment was $4 million for the nine month period ended September 30, 2015, or 1.3% of revenue, as compared with $9 million, or 3.6% of revenue, for the same period in 2014, a decrease of approximately $5 million. For the nine month period ended September 30, 2015, Power Generation and Industrial segment EBITDA includes $21 million of losses on a troubled wind project, partially offset by project efficiencies and improved cost utilization from higher levels of revenue.

Other Segment. EBITDA from Other businesses was negative $7 million for the nine month period ended September 30, 2015, as compared with breakeven EBITDA for the same period in 2014. As compared with the same period in the prior year, the decrease in EBITDA for the nine month period ended September 30, 2015 was driven primarily by $8 million of losses on a proportionately consolidated non-controlled Canadian joint venture that was acquired in 2014 and experienced project delays, offset, in part, by positive EBITDA on our other international operations.

Corporate. Corporate EBITDA was negative $41 million for the nine month period ended September 30, 2015, as compared with negative EBITDA of $39 million for the same period in 2014. For the nine month period ended September 30, 2015, Corporate EBITDA includes $14 million of costs related to the Audit Committee independent investigation. The increase in Corporate EBITDA from Audit Committee independent investigation costs was offset, in part, by a net reduction in the estimated earnout liability for acquired businesses and a reduction in stock-based and incentive compensation expense.

Foreign Operations

We have operations in Canada, Mexico and in other countries in Latin America. See Note 14 - Segments and Related Information in the notes to the condensed unaudited consolidated financial statements, which is incorporated by reference.

Non-U.S. GAAP Financial Measures

As appropriate, we supplement our reported U.S. GAAP financial information with certain non-U.S. GAAP financial measures, including earnings from continuing operations before interest, income taxes, depreciation and amortization (“EBITDA”). In addition, we have presented “Adjusted EBITDA,” as well as adjusted net income from continuing operations (“Adjusted Net Income From Continuing Operations”) and adjusted diluted earnings per share from continuing operations (“Adjusted Diluted Earnings Per Share From Continuing Operations”). All of these “adjusted” non-U.S GAAP measures exclude non-cash stock-based compensation expense, acquisition integration costs resulting from the WesTower acquisition, Audit Committee independent investigation related costs, project losses on a non-controlled joint venture, charges from a settlement reached during a court mandated mediation and, for adjusted Net Income from Continuing Operations, the effect of an Alberta provincial income tax rate increase. See Note 10 - Stock-Based Compensation and Other Employee Benefit Plans, Note 3 - Acquisitions, Note 14 - Segments and Related Information, Note 15 - Commitments and Contingencies and Note 13 - Income Taxes in the notes to the condensed unaudited consolidated financial statements, which are incorporated by reference. The definitions of EBITDA and Adjusted EBITDA above are not the same as in our Credit Facility or in the indenture governing our notes; therefore, EBITDA and Adjusted EBITDA as presented in this discussion should not be used for purposes of determining our compliance with the covenants contained in our debt instruments.

We use EBITDA, Adjusted EBITDA, Adjusted Net Income From Continuing Operations and Adjusted Diluted Earnings Per Share From Continuing Operations to evaluate our performance, both internally and as compared with our peers, because these measures exclude certain items that may not be indicative of our core operating results, as well as items that can vary widely across different industries or among companies within the same industry. Additionally, these measures provide a baseline for analyzing trends in our underlying business. Management also considers EBITDA and Adjusted EBITDA as indicators of our ability to generate cash to service debt, fund capital expenditures and expand our business, but management does not consider the presented non-U.S. GAAP financial measures as measures of our liquidity. While EBITDA and Adjusted EBITDA are measures of our ability to generate cash, these measures exclude the cash impact of changes in our assets and liabilities as well as interest and income taxes. Net cash provided by operating activities in the consolidated statements of cash flows accounts for these changes in our assets and liabilities.

We believe these non-U.S. GAAP financial measures provide meaningful information and help investors understand our financial results and assess our prospects for future performance. Because non-U.S. GAAP financial measures are not standardized, it may not be possible to compare these financial measures with other companies’ non-U.S. GAAP financial measures having the same or similar names. These financial measures should not be considered in isolation from, as substitutes for, or alternative measures of, reported net income (loss) from continuing operations, diluted earnings (loss) per share from continuing operations and net cash provided by operating activities, and should be viewed in conjunction with the most comparable U.S. GAAP financial measures and the provided reconciliations thereto. We believe these non-U.S. GAAP financial measures, when viewed together with our U.S. GAAP results and related reconciliations, provide a more complete understanding of our business. We strongly encourage investors to review our consolidated financial statements and publicly filed reports in their entirety and not rely on any single financial measure.

The following table presents a reconciliation of EBITDA and Adjusted EBITDA to net income (loss) from continuing operations, in dollar and percentage of revenue terms, for the periods indicated (dollar amounts in millions). The tables below may contain slight summation differences due to rounding.

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	For the Three Months Ended September 30,								For the Nine Months Ended September 30,
	2015				2014				2015					2014
EBITDA Reconciliation - Continuing Operations:					As Restated									As Restated
Net income (loss) from continuing operations	$	7.4	0.7	%	$	49.4	3.8	%	$	(2.8	)	(0.1	)%	$	95.4	2.8	%
Interest expense, net	12.0		1.1	%	12.6		1.0	%	35.8			1.1	%	37.6		1.1	%
Provision for income taxes	6.2		0.6	%	30.3		2.3	%	3.3			0.1	%	58.6		1.7	%
Depreciation and amortization	42.2		3.8	%	41.7		3.2	%	128.0			4.0	%	112.0		3.3	%
EBITDA – Continuing operations	$	67.8	6.1	%	$	134.2	10.2	%	$	164.4		5.2	%	$	303.6	9.0	%
Non-cash stock-based compensation expense	3.2		0.3	%	4.1		0.3	%	9.5			0.3	%	11.6		0.3	%
Acquisition integration costs	1.2		0.1	%	—		—		17.8			0.6	%	—		—
Audit Committee investigation related costs	4.1		0.4	%	—		—		13.7			0.4	%	—		—
Losses on non-controlled joint venture	2.8		0.3	%	—		—		8.3			0.3	%	—		—
Court mandated mediation settlement	12.2		1.1	%	—		—		12.2			0.4	%	—		—
Adjusted EBITDA – Continuing operations	$	91.1	8.2	%	$	138.3	10.5	%	$	225.9		7.1	%	$	315.2	9.3	%

Adjusted EBITDA and Adjusted EBITDA margin for our continuing operations by reportable segment, and a related reconciliation to EBITDA for our continuing operations, for the periods indicated is as follows:

	For the Three Months Ended September 30,										For the Nine Months Ended September 30,
	2015					2014					2015					2014
Reportable Segment:						As Restated										As Restated
Communications	$	51.0		9.9	%	$	52.6		10.4	%	$	160.0		11.0	%	$	154.0		10.4	%
Oil and Gas	51.0			12.5	%	73.4			13.2	%	113.9			10.0	%	144.2			11.1	%
Electrical Transmission	(11.6		)	(15.2	)%	18.5			13.4	%	(35.4		)	(13.1	)%	35.1			10.7	%
Power Generation and Industrial	4.8			4.2	%	4.9			4.3	%	3.9			1.3	%	9.4			3.6	%
Other	0.8			21.4	%	(0.7		)	(16.9	)%	1.2			6.8	%	(0.1		)	(1.1	)%
Eliminations	—			—		—			—		—			—		—			—
Corporate	(4.9		)	NA		(10.4		)	NA		(17.7		)	NA		(27.4		)	NA
Adjusted EBITDA - Continuing operations	$	91.1		8.2	%	$	138.3		10.5	%	$	225.9		7.1	%	$	315.2		9.3	%
Non-cash stock-based compensation expense	3.2			0.3	%	4.1			0.3	%	9.5			0.3	%	11.6			0.3	%
Acquisition integration costs	1.2			0.1	%	—			—		17.8			0.6	%	—			—
Audit Committee investigation related costs	4.1			0.4	%	—			—		13.7			0.4	%	—			—
Losses on non-controlled joint venture	2.8			0.3	%	—			—		8.3			0.3	%	—			—
Court mandated mediation settlement	12.2			1.1	%	—			—		12.2			0.4	%	—			—
EBITDA – Continuing operations	$	67.8		6.1	%	$	134.2		10.2	%	$	164.4		5.2	%	$	303.6		9.0	%

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The following table presents a reconciliation of EBITDA and Adjusted EBITDA to net cash provided by operating activities for total MasTec (in millions):

	For the Nine Months Ended September 30,
	2015			2014
Total EBITDA Reconciliation:				As Restated
EBITDA - Continuing operations	$	164.4		$	303.6
EBITDA - Discontinued operations	—			(1.0		)
EBITDA - Total MasTec	$	164.4		$	302.7
Reconciliation to Adjusted EBITDA and to Net Cash Provided by Operating Activities, Total MasTec:
Non-cash stock-based compensation expense	9.5			11.6
Acquisition integration costs	17.8			—
Audit Committee investigation related costs	13.7			—
Losses on non-controlled joint venture	8.3			—
Court mandated mediation settlement	12.2			—
Adjusted EBITDA - Continuing operations	$	225.9		$	315.2
Adjusted EBITDA - Discontinued operations	—			(1.0		)
Adjusted EBITDA - Total MasTec	$	225.9		$	314.2
Interest expense, net	(35.8		)	(37.6		)
Provision for income taxes	(3.3		)	(58.2		)
Acquisition integration costs	(17.8		)	—
Audit Committee investigation related costs	(13.7		)	—
Losses on non-controlled joint venture	(8.3		)	—
Court mandated mediation settlement	(12.2		)	—
Adjustments to reconcile net (loss) income to net cash provided by operating activities, excluding non-cash EBITDA adjustments (a)	(15.9		)	3.9
Change in assets and liabilities, net of acquisitions	141.7			(141.3		)
Net cash provided by operating activities, Total MasTec	$	260.6		$	81.0

(a) Non-cash EBITDA adjustments include (i) depreciation and amortization expense in both periods and (ii) non-cash stock-based compensation expense in both periods.

Adjusted Income From Continuing Operations and Adjusted Diluted Earnings Per Share From Continuing Operations

The table below reconciles Adjusted Net Income From Continuing Operations and Adjusted Diluted Earnings Per Share From Continuing Operations with reported net income (loss) from continuing operations and reported diluted earnings (loss) per share from continuing operations, the most directly comparable U.S. GAAP financial measures. Adjustments have been tax-effected using the effective tax rate from continuing operations for the respective periods, excluding certain discrete items. For the nine month period ended September 30, 2015, because the reported loss from continuing operations, on an adjusted basis is income from continuing operations, we included an additional 0.6 million weighted average common stock equivalents in our diluted share count to calculate adjusted diluted earnings per share for the respective period.

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	For the Three Months Ended September 30,										For the Nine Months Ended September 30,
	2015						2014				2015						2014
	Net Income (in millions)			Diluted Earnings Per Share			Net Income (in millions)		Diluted Earnings Per Share		Net (Loss) Income (in millions)			Diluted (Loss) Earnings Per Share			Net Income (in millions)		Diluted Earnings Per Share
Continuing Operations:							As Restated										As Restated
Reported U.S. GAAP measure	$	7.4		$	0.09		$	49.4	$	0.57	$	(2.8	)	$	(0.03	)	$	95.4	$	1.11
Adjustments:(a)
Non-cash stock-based compensation expense	1.8			0.02			2.5		0.03		5.3			0.06			7.2		0.08
Acquisition integration costs	0.7			0.01			—		—		9.9			0.12			—		—
Audit Committee investigation related costs (b)	2.3			0.03			—		—		8.1			0.10			—		—
Impact of Alberta tax law change	(0.2		)	(0.00		)	—		—		2.6			0.03			—		—
Losses on non-controlled joint venture	1.6			0.02			—		—		4.6			0.06			—		—
Court mandated mediation settlement	6.8			0.08			—		—		6.8			0.08			—		—
Adjusted non-U.S. GAAP measure	$	20.4		$	0.26		$	52.0	$	0.60	$	34.6		$	0.43		$	102.6	$	1.19

(a) Reconciling items represent the after-tax expense and corresponding diluted per share impact for the respective adjustments presented above.

(b) Audit Committee investigation related costs for the nine month period ended September 30, 2015 include the after-tax effect of approximately $1 million of consent solicitation agent fees recorded within interest expense, net, in 2015, related to the delay in filing of the 2014 Form 10-K and the First Quarter 2015 Form 10-Q.

Financial Condition, Liquidity and Capital Resources

Our primary sources of liquidity are cash flows from continuing operations, availability under our Credit Facility and our cash balances. Our primary liquidity needs are for working capital, income taxes, capital expenditures, insurance collateral in the form of cash and letters of credit, earn-out obligations, equity, joint venture and other investments and debt service. We also evaluate opportunities for strategic acquisitions and investments from time to time, and we may consider opportunities to repurchase, refinance or retire outstanding debt or repurchase additional shares of our outstanding common stock in the future, any of which may require our use of cash.

Capital Expenditures. We estimate that we will spend approximately $85 million in 2015 on capital expenditures, or approximately $75 million, net of asset disposals. We expect to incur approximately $25 million to $35 million of equipment purchases under capital lease or other financing arrangements. For the nine month period ended September 30, 2015, we spent approximately $71 million on capital expenditures, or $61 million net of asset disposals, and incurred approximately $26 million of equipment purchases under capital lease and other financing arrangements. Actual capital expenditures may increase or decrease from estimates depending upon business activity levels. We will continue to evaluate lease versus buy decisions to meet our equipment needs and, based on this evaluation, our capital expenditures may increase or decrease in the future.

Acquisition-Related Contingent Consideration. In most of our acquisitions, we have agreed to make future earn-out payments to the sellers, which are contingent upon the future earnings performance of the acquired businesses. Certain earn-out payments may be paid in either cash or, under specific circumstances, MasTec common stock, or a combination thereof, at our option. The estimated total value of earn-out obligations recorded as liabilities as of September 30, 2015 was approximately $95 million. Of this amount, $10 million represents the liability for earn-out obligations that have been earned. The remainder, $85 million, is management’s estimate of potential earn-out obligations that are contingent upon future performance. Potential future earn-out obligations for acquisitions after January 1, 2009 are measured at their estimated fair value as of the date of acquisition, with subsequent changes in fair value recorded in earnings as a component of other income or expense, in accordance with U.S. GAAP. Earn-outs for acquisitions completed prior to January 1, 2009 are recorded as additional goodwill as earned. During the three month periods ended September 30, 2015 and 2014, we made cash payments of $6 million and $1 million, respectively, related to earn-out obligations. During the nine month periods ended September 30, 2015 and 2014, we made cash payments of $45 million and $60 million, respectively, related to earn-out obligations.

Income Taxes. Cash tax payments, net of tax refunds, were $6 million for the nine month period ended September 30, 2015 as compared with $46 million for the nine month period ended September 30, 2014. Quarterly tax payments are based on estimates of full year taxable income activity and estimated tax rates. Our cash tax payments, which have decreased in 2015 as compared with 2014, vary from period to period with changes in taxable income and earnings estimates.

Working Capital. We need working capital to support seasonal variations in our business, primarily due to the impact of weather conditions on external construction and maintenance work and the spending patterns of our customers, both of which influence the timing of associated spending to support related customer demand. Our business is typically slower in the first quarter of each calendar year. Working capital needs are generally higher during the summer or fall months due to increased demand for our services when favorable weather conditions exist in many of the regions in which we operate. Conversely, working capital needs are typically converted to cash during the winter months. These seasonal trends, however, can be offset by changes in the timing of projects, which can be affected by project delays or accelerations and/or other factors that may affect customer spending.

Working capital needs also tend to increase when we commence multiple projects or particularly large projects because labor, including subcontractor and certain other costs, including inventory, become payable before the receivables resulting from work performed are billed and collected. Timing of billing milestones and project close-outs can contribute to changes in unbilled revenue. As of September 30, 2015, we expect that substantially all of our costs in excess of billings and earnings will be billed to customers in the normal course of business within the next twelve months. Accounts receivable balances, which consist of contract billings as well as costs and earnings in excess of billings and retainage, decreased to $1.0 billion as of

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September 30, 2015 from $1.3 billion as of December 31, 2014, due to lower levels of quarterly revenue in the third quarter of 2015 as compared with the fourth quarter of 2014, as well as working capital initiatives and a decrease in our days sales outstanding (“DSO”), net of billings in excess of costs and earnings, as discussed below. Inventory balances have decreased from $113 million as of December 31, 2014 to $91 million as of September 30, 2015, primarily due to utilization of wireless project inventories, which increased during 2014 due to inventory from acquired businesses as well as from increases in wireless project inventories.

Our billing terms are generally net 30 days, and some of our contracts allow our customers to retain a portion of the contract amount (generally from 5% to 10%) until the job is completed. For certain customers, we maintain inventory to meet the materials requirements of the contracts. Occasionally, certain of our customers pay us in advance for a portion of the materials we purchase for their projects, or allow us to pre-bill them for materials purchases up to specified amounts. Vendor terms are generally 30 days. Our agreements with subcontractors often contain a “pay-if-paid” provision, whereby our payments to subcontractors are made only after we are paid by our customers.

Settlement of Convertible Notes. In 2014, our senior convertible notes, in an original principal amount of $215 million, matured and were converted by the holders. We paid $202 million in cash using proceeds from our Credit Facility and issued 6.6 million shares of our common stock in respect thereof. The shares issued included 5.8 million premium shares, which represented the conversion value of certain of the convertible notes in excess of their principal amount. See discussion in Note 10 - Debt in the notes to the audited consolidated financial statements included in our 2014 Form 10-K.

Summary of Financial Condition, Liquidity and Capital Resources

We anticipate that funds generated from operations, borrowings under our Credit Facility and our cash balances will be sufficient to meet our working capital requirements, required income tax payments, debt service obligations, anticipated capital expenditures, equity, joint venture and other investments, insurance collateral requirements, earn-out obligations and letters of credit for at least the next twelve months.

Sources and Uses of Cash

As of September 30, 2015, we had $451 million in working capital, defined as current assets less current liabilities, as compared with $551 million as of December 31, 2014, a decrease of $100 million, driven primarily by lower activity levels in the third quarter of 2015 as compared with the fourth quarter of 2014. Total cash and cash equivalents of $7 million as of September 30, 2015decreased by $17 million from total cash and cash equivalents of $24 million as of December 31, 2014.

Sources and uses of cash are summarized below (in millions):

	For the Nine Months Ended September 30,
	2015			2014
				As Restated
Net cash provided by operating activities	$	260.6		$	81.0
Net cash used in investing activities	$	(170.5	)	$	(242.7	)
Net cash (used in) provided by financing activities	$	(107.2	)	$	147.0

Operating Activities. Cash flow from operations is primarily influenced by demand for our services and operating margins, but can also be affected by working capital needs associated with the various types of services we provide. Working capital is affected by changes in accounts receivable, costs and earnings in excess of billings and billings in excess of costs and earnings, all of which tend to be related. These working capital items are also generally affected by changes in revenue resulting from both the timing and the volume of work performed, by variability in the timing of customer billings and collections of receivables, as well as settlement of payables and other obligations. Net cash provided by operating activities for the nine month period ended September 30, 2015 was $261 million, as compared with $81 million of net cash provided by operating activities for the same period in 2014. Net changes in assets and liabilities had a positive impact on cash provided by operating activities of $283 million, related largely to changes in accounts receivable and inventory levels, net of acquired businesses, offset, in part, by changes in accounts payable and accrued expenses. The positive effect of net changes in assets and liabilities was partially offset by a net loss of $3 million for the nine month period ended September 30, 2015 as compared with net income of $95 million in the 2014 period.

Our DSO, net of billings in excess of costs and earnings was 75 as of September 30, 2015, as compared with 86 as of June 30, 2015 and 88 as of September 30, 2014. DSO, net of billings in excess of costs and earnings, is calculated as accounts receivable, net, less billings in excess of costs and earnings, divided by average daily revenue for the most recently completed quarter as of the balance sheet date. The decrease in DSO is primarily attributable to improved timing of collections, changes in project and customer mix and the settlement of certain disputed matters. Other than matters subject to litigation, we do not anticipate material collection issues related to our outstanding accounts receivable balances, nor do we have material amounts due from customers experiencing financial difficulties. We expect to collect substantially all of our outstanding accounts receivable, net, within the next twelve months.

Investing Activities. Net cash used in investing activities decreased by $72 million to $170 million for the nine month period ended September 30, 2015 from $243 million for the nine month period ended September 30, 2014. Acquisition-related payments decreased by $163 million as compared with the prior year period. The decrease in acquisition-related payments was offset, in part, by an increase of $108 million in payments for other investments, related primarily to activity associated with our equity method investees and contractual joint venture. See Note 3 - Acquisitions and Note 5 - Fair Value of Financial Instruments, which notes are incorporated by reference, for discussion of our cost and equity method investments,

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including our investment in two joint ventures related to the construction of pipelines that are planned to interconnect at the U.S./Mexico border. For the nine month period ended September 30, 2015, we spent $71 million on capital expenditures, or $61 million, net of asset disposals, as compared with capital expenditures, net of asset disposals, of $79 million for the same period in the prior year, a decrease of $18 million. Total capital additions, including capital lease and other financing arrangements, have decreased from $153 million for the nine month period ended September 30, 2014 to $97 million for the nine month period ended September 30, 2015 due to lower levels of activity as compared with the same period in the prior year.

Financing Activities. Net cash used in financing activities for the nine month period ended September 30, 2015 was $107 million, as compared with net cash provided by financing activities of $147 million for the nine month period ended September 30, 2014, a decrease in cash provided by financing activities of approximately $254 million. Credit facility related activity, net, for the nine month period ended September 30, 2015, totaled $89 million of borrowings, net of repayments, compared to $364 million of borrowings, net of repayments, for the nine month period ended September 30, 2014, for a decrease in cash provided by financing activities from credit facility-related activities, net, of $275 million. Payments of acquisition-related contingent consideration for the nine month period ended September 30, 2015decreased by $16 million as compared with the same period in the prior year, representing an increase in cash provided by financing activities. Additionally, for the nine month period ended September 30, 2015, we paid $100 million to repurchase shares of our common stock under our 2014 Share Repurchase Program, whereas for the same period in 2014, we paid $105 million in settlement of our 4.0% Convertible Notes, for a net increase in cash provided by financing activities of $5 million.

Senior Secured Credit Facility

We have a senior secured credit facility, which we refer to as the Credit Facility. Under the Credit Facility, aggregate borrowing commitments total $1.25 billion, composed of $1.0 billion of revolving commitments and a term loan in the aggregate principal amount of $250 million (the “Term Loan”). The Credit Facility provides the ability to borrow in either Mexican pesos or Canadian dollars, up to an aggregate equivalent amount of $200 million. Revolving commitments under the Credit Facility mature on October 29, 2018, and the Term Loan matures on November 21, 2019. The Term Loan is subject to amortization in quarterly principal installments of $3.1 million, subject to reduction as a result of the application of certain prepayments in accordance with the terms of the Credit Facility, commencing as of the quarter ending March 31, 2016 and continuing for each fiscal quarter thereafter. The maximum amount available for letters of credit under the Credit Facility is $450 million, of which up to $100 million can be denominated in either Mexican pesos or Canadian dollars. The Credit Facility also provides for swing line loans of up to $75 million. Under the Credit Facility, we have the option to increase revolving commitments and/or establish additional term loan tranches in an aggregate amount of $250 million. Borrowings under the Credit Facility are used for working capital requirements, capital expenditures and other corporate purposes, including equity, joint venture or other investments, the repurchase or prepayment of indebtedness and share repurchases under authorized share repurchase programs.

Interest on outstanding revolving loans and the Term Loan under the Credit Facility accrues at variable rates based, at our option, on a Eurocurrency rate, as defined in the Credit Facility, plus a margin, or a base rate, as defined in the Credit Facility, plus a margin. As of September 30, 2015, we had $349.3 million of outstanding revolving loans under the Credit Facility, which accrued interest at a weighted average interest rate of 2.50%, and $172.4 million of issued letters of credit, which mature at various dates. Letter of credit fees accrued at 1% per annum for performance standby letters of credit and 2% for financial standby letters of credit. The Term Loan accrued interest at a rate of 2.19% as of September 30, 2015. Borrowing capacity of $478.3 million as of September 30, 2015 was available for revolving loans or up to $277.6 million for new letters of credit. The unused facility fee was 0.40% as of September 30, 2015. The Credit Facility is guaranteed by certain of our subsidiaries (the “Guarantor Subsidiaries”) and the obligations under the Credit Facility are secured by substantially all of our and the Guarantor Subsidiaries’ respective assets, subject to certain exceptions.

In September 2015, we amended the terms of our Credit Facility (the “Amendment”) to provide additional short-term flexibility for potential borrowings. The Amendment provides for a maximum consolidated leverage ratio, as defined in the Credit Facility, of up to (i) 4.25 during the period commencing on September 30, 2015 and ending on September 29, 2016, (ii) 4.00 during the period commencing on September 30, 2016 and ending on December 30, 2016, and (iii) 3.50 thereafter. The Amendment also revised the calculation of Consolidated EBITDA, as defined, as of September 30, 2015 and December 31, 2015 to permit MasTec to add back up to an additional $21.5 million and $10.5 million, respectively, of certain cash charges in addition to those previously prescribed for the twelve month periods ended September 30, 2015 and December 31, 2015. We paid consent fees of $1.3 million in connection with the Amendment, which were recorded within deferred financing costs in the third quarter of 2015. We are dependent upon borrowings and letters of credit under the Credit Facility to fund our operations. Should we be unable to comply with the terms and conditions of the Credit Facility, we would be required to obtain modifications to the Credit Facility or obtain an alternative source of financing to continue to operate, neither of which may be available to us on commercially reasonable terms, or at all. The Credit Facility is subject to certain provisions and covenants, as more fully described in Note 10 - Debt in the notes to the audited consolidated financial statements included in the 2014 Form 10-K. As of September 30, 2015, we were in compliance with these provisions and covenants.

Other Credit Facilities. We have other credit facilities that support the working capital requirements of our foreign operations, which have varying dates of maturity and are generally renewed on an annual basis. Borrowings under these credit facilities are primarily denominated in Canadian dollars and maximum borrowing capacity totaled approximately $30.0 million as of September 30, 2015. Outstanding borrowings, which accrued interest at a weighted average rate of 3.8%, totaled approximately $9.5 million as of September 30, 2015.

4.875% Senior Notes

We have $400 million outstanding principal amount of 4.875% Senior Notes, which are subject to certain provisions and covenants, as more fully described in Note 10 - Debt in the notes to the audited consolidated financial statements included in the Company’s 2014 Form 10-K. As of September 30, 2015, we were in compliance with these provisions and covenants.

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Senior Convertible Notes

Our senior convertible notes, which matured in 2014, were composed of $202 million aggregate principal amount of senior convertible notes issued in 2011 and approximately $13 million aggregate principal amount of senior convertible notes issued in 2009. In accordance with our previously stated intent, we settled the $202 million principal amount of the 2011 Convertible Notes in cash and the premium value in shares, resulting in the issuance of 5.8 million shares of our common stock. Upon maturity of the 2009 Convertible Notes, we issued 0.8 million shares of our common stock.

Debt Guarantees and Covenants

The 4.875% Senior Notes are senior unsecured unsubordinated obligations and rank equal in right of payment with existing and future unsubordinated debt, and rank senior in right of payment to existing and future subordinated debt and are fully and unconditionally guaranteed on an unsecured, unsubordinated, joint and several basis by certain of our existing and future 100%-owned direct and indirect domestic subsidiaries that are each guarantors of the Credit Facility or other outstanding indebtedness. See Note 17 - Supplemental Guarantor Condensed Unaudited Consolidating Financial Information in the notes to the condensed unaudited consolidated financial statements, which is incorporated by reference.

We were in compliance with the provisions and covenants contained in our outstanding debt instruments as of September 30, 2015.

Additional Information

For detailed discussion and additional information pertaining to our debt instruments, see Note 10 - Debt in the notes to the audited consolidated financial statements included in our 2014 Form 10-K. Also see Note 8 - Debt in the notes to the condensed unaudited consolidated financial statements in this Quarterly Report on Form 10-Q for current period balances and discussion, which is incorporated by reference.

Off-balance sheet arrangements

As is common in our industry, we have entered into certain off-balance sheet arrangements in the ordinary course of business. Our significant off-balance sheet transactions include liabilities associated with non-cancelable operating leases, letter of credit obligations, surety and performance and payment bonds entered into in the normal course of business, self-insurance liabilities, liabilities associated with multi-employer pension plans, liabilities associated with certain indemnification and guarantee arrangements and obligations relating to our non-consolidated affiliates, joint venture arrangements and variable interest entities. Refer to Note 15 - Commitments and Contingencies in the notes to the condensed unaudited consolidated financial statements, which is incorporated by reference, for current period details pertaining to our off-balance sheet arrangements. See Note 3 - Acquisitions and Note 5 - Fair Value of Financial Instruments for discussion pertaining to certain of our cost and equity method investments and other investment arrangements, which notes are incorporated by reference.

Impact of Inflation

The primary inflationary factors affecting our operations are labor and fuel costs, and to a lesser extent, material costs. The prices of oil and gas are subject to unexpected fluctuations due to events outside of our control, including geopolitical events and fluctuations in global supply and demand. An example is the recent volatility experienced by the oil markets due to declining oil prices beginning in the latter part of 2014. We closely monitor inflationary factors and any impact they may have on our operating results or financial condition.

ITEM 3.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Interest Rate Risk

As of September 30, 2015, our variable interest rate debt was primarily related to our Credit Facility. Interest on outstanding revolving loans under our Credit Facility accrues at variable rates based, at our option, on a Eurocurrency rate, as defined in the Credit Facility, plus a margin, or a base rate, as defined in the Credit Facility, plus a margin. Interest on our Term Loan under the Credit Facility accrues at a variable rate based, at our option, on either a Eurocurrency rate or base rate, each as defined in the Credit Facility, in each case, plus a margin. As of September 30, 2015, we had $349 million aggregate principal amount of outstanding revolving loans under our Credit Facility with a weighted average interest rate of 2.50% and a Term Loan with a balance of $250 million with an interest rate of 2.19%. Interest on letters of credit issued under our Credit Facility as of September 30, 2015 accrued at 1% per annum for performance standby letters of credit and at 2% per annum for financial standby letters of credit. A 100 basis point increase in the applicable interest rates under our Credit Facility would not have had a material impact on our results of operations for the three or nine month periods ended September 30, 2015.

As of September 30, 2015, our fixed interest rate debt primarily included $400 million aggregate principal amount of 4.875% Senior Notes and $21 million of notes payable for equipment, which had a weighted average interest rate of approximately 2.7%. None of this debt subjects us to interest rate risk, but we may be subject to changes in interest rates if and when we refinance this debt at maturity or otherwise.

Foreign Currency Risk

We have operations in Canada, Mexico and in other countries in Latin America. Revenue generated from foreign operations represented 10% and 14% of our total revenue for the three and nine month periods ended September 30, 2015, respectively. Revenue and expenses related to our foreign operations are, for the most part, denominated in the functional currency of the foreign operation, which minimizes the impact that fluctuations in exchange rates would have on net income or loss. We are subject to fluctuations in foreign currency exchange rates when transactions are denominated in currencies other than the functional currencies. Such transactions were not material to our operations for the nine month period ended September 30, 2015. Translation gains or losses, which are recorded in other comprehensive income or loss, result from translation of the assets and liabilities of our foreign subsidiaries into U.S. dollars. For the three and nine month periods ended September 30, 2015, foreign currency translation losses totaled

45

approximately $13 million and $32 million, respectively, and related primarily to our Canadian operations. Our Canadian presence has grown in recent years due to acquisitions.

Our exposure to fluctuations in foreign currency exchange rates could increase in the future if we continue to expand our operations outside of the United States. We seek to manage foreign currency exposure by minimizing our consolidated net asset and liability positions in currencies other than the functional currency, neither of which were material as of September 30, 2015. We may enter into foreign currency derivative contracts in the future to manage such exposures.

Item 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

As of the end of the period covered by this Quarterly Report on Form 10-Q, our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)). We maintain disclosure controls and procedures designed to ensure that information required to be disclosed in reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure. In conducting the evaluation and in light of the Audit Committee independent investigation described in the 2014 Form 10-K, we identified the material weakness in our internal control over financial reporting within a service line in our Electrical Transmission segment described below. As a result, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were not effective at the reasonable assurance level as of September 30, 2015.

A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of our annual or interim financial statements will not be prevented or detected on a timely basis.

Management determined that a material weakness in internal control over financial reporting existed within a service line in our Electrical Transmission segment due to the operational failure of the internal control process requiring adequate documentation of significant judgments made in determining cost-to-complete estimates under percentage-of-completion accounting. The review process failed to ensure that cost-to-complete estimates had sufficient supporting documentation. As a result, significant judgments were made and incorporated into the accounting records used to determine project revenue without sufficient documentation that clearly sets forth the rationale and factors used in making those judgments.

This material weakness resulted in the restatement of the Company’s first quarter 2014, second quarter 2014 and third quarter 2014 condensed unaudited consolidated financial statements.

Management’s Plans for Remediation of the Material Weakness

In response to this material weakness, the Company has developed a plan to remediate this material weakness. Currently, the plan to remediate includes the following:

• The Company will revise its existing MasTec Revenue Recognition Policy (the “MasTec Policy”) with more detailed guidance on cost estimation procedures, project cost reserves and other aspects of percentage-of-completion accounting;

• The MasTec Policy will require sufficient supporting documentation of significant judgments made in cost-to-complete estimates, including documentation of major assumptions, discussions and factors considered in making those decisions;

• The Company has formalized and provided staffing to implement a procedure pursuant to which corporate personnel perform reviews of significant project variances and inspect documentation to determine that changes are in accordance with the MasTec Policy, have appropriate rationale and sufficient supporting documentation;

• The Company implemented temporary remedial and mitigating procedures during 2015, which have been performed to date, and which will continue to be performed into the foreseeable future, and is evaluating the need for additional permanent remedial measures.

Changes in Internal Control over Financial Reporting

There have been no changes in the Company’s internal control over financial reporting during the quarter ended September 30, 2015 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting other than identification of the material weakness identified above, along with related remediation efforts.

PART II.     OTHER INFORMATION

46

ITEM 1. LEGAL PROCEEDINGS

Legacy Litigation

Refer to Note 15 – Commitments and Contingencies in the notes to our condensed unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q, which is incorporated by reference in this Item 1, for a discussion of any recent material developments related to our legal proceedings since the filing of our 2014 Form 10-K.

ITEM 1A. RISK FACTORS

Except as set forth below, there have been no material changes to either the cautionary statement regarding forward-looking statements or to any of the risk factors disclosed in our 2014 Form 10-K, as updated by our Quarterly Reports on Form 10-Q.

Risks Related to Our Business

We derive a significant portion of our revenue from a few customers and the loss of one or more of these customers, or a reduction in their demand for our services, could impair our financial performance.

Taking into consideration, the July 2015 acquisition of DIRECTV® by AT&T, we derived approximately 31% of our revenue from AT&T for the nine month period ended September 30, 2015, and for the nine month period ended September 30, 2014, we derived approximately 33% and 10% of our revenue from AT&T and, and Enbridge, Inc., respectively. Additionally, our top ten customers accounted for 60% and 68% of our revenue for the nine month periods ended September 30, 2015 and 2014, respectively. Because our business is concentrated among relatively few major customers, and certain of our services are provided on a non-recurring, project by project basis, our results of operations, cash flows and liquidity could be negatively affected if these customers reduce the amount of business they provide to us, or if we complete the required work on our projects for these customers and cannot replace them with similar projects. More than half of our revenue for the nine month period ended September 30, 2015 was derived from non-recurring project specific work. In addition, many of the contracts with our largest customers may be canceled on short or no advance notice. Any of these factors could negatively impact our results of operations, cash flows and liquidity.

Our operations in existing international markets, or expanding into additional international markets, may not be successful and could expose us to risks, including the failure to comply with the U.S. Foreign Corrupt Practices Act and other similar anti-bribery laws, which could harm our business and prospects.

We derived 14% of our revenue for the nine months ended September 30, 2015 from international markets, and we may further expand the volume of international services we provide as well as the foreign geographic territories in which we operate. Our international operations are presently conducted primarily in Canada, Mexico and in other countries in Latin America, but we have performed work in various other foreign countries, and revenue derived from, or the number of countries in which we operate, could expand over the next few years. Economic conditions, including those resulting from wars, civil unrest, acts of terrorism and other conflicts, or volatility in the global markets may adversely affect our customers, their demand for our services and their ability to pay for our services. In addition, there are numerous risks inherent in conducting our business internationally, including, but not limited to, potential instability in international markets, changes in regulatory requirements applicable to international operations, foreign currency fluctuations, exchange controls and other limits on our ability to repatriate earnings, political, economic and social conditions in foreign countries and complex U.S. and foreign laws and treaties, including tax laws and the U.S. Foreign Corrupt Practices Act (the “FCPA”). These risks could restrict our ability to provide services to international customers or to operate our international business profitably, and our overall business and results of operations could be negatively affected by our foreign activities.

The FCPA and similar anti-bribery laws in other jurisdictions prohibit U.S.-based companies and their intermediaries from making improper payments for the purpose of obtaining or retaining business. We pursue opportunities in certain parts of the world that experience corruption to some degree, and, in certain circumstances, compliance with anti-bribery laws may conflict with local customs and practices. Our policies mandate compliance with these anti-bribery laws. Further, we require our subcontractors, agents and others who work for us or on our behalf to comply with the FCPA and other anti-bribery laws. Although we have policies and procedures designed to ensure that we, our employees and our agents comply with the FCPA and other anti-bribery laws, there is no assurance that such policies or procedures will protect us against liability under the FCPA or other laws for actions taken by our agents, employees and intermediaries. If we are found to be liable for FCPA violations (either due to our own acts or our inadvertence, or due to the acts or inadvertence of others), we could incur severe criminal or civil penalties or other sanctions, which could have a material adverse effect on our reputation, business, results of operations or cash flows. In addition, detecting, investigating, and resolving actual or alleged FCPA violations is expensive and can consume significant time and attention of our senior management.

47

ITEM 2.     UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

The following table provides information about repurchases of our common stock during the quarter ended September 30, 2015:

Period	Total Number of Shares Purchased (a)	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Program	Approximate Dollar Value of Shares that May Yet be Purchased under the Program
July 1 through July 31	—	$	—	—	$	—
August 1 through August 31	1,324	$	17.41	—	$	—
September 1 through September 30	—	$	—	—	$	—
Total	1,324			—

(a) Reflects share repurchases associated with certain employee elections under compensation and benefit programs.

ITEM 6.     EXHIBITS

Exhibit No.	Description
12.1*	Computation of Ratio of Earnings to Fixed Charges
31.1*	Certifications required by Section 302(a) of the Sarbanes-Oxley Act of 2002
31.2*	Certifications required by Section 302(a) of the Sarbanes-Oxley Act of 2002
32.1**	Certifications required by Section 906 of the Sarbanes-Oxley Act of 2002
32.2**	Certifications required by Section 906 of the Sarbanes-Oxley Act of 2002
101.INS*	XBRL Instance Document
101.SCH*	XBRL Taxonomy Extension Schema
101.CAL*	XBRL Taxonomy Extension Calculation Linkbase
101.DEF*	XBRL Taxonomy Extension Definition Linkbase
101.LAB*	XBRL Taxonomy Extension Label Linkbase
101.PRE*	XBRL Taxonomy Extension Presentation Linkbase

______________

* Filed herewith.

** Furnished herewith.

48

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

		MASTEC, INC.
Date:	November 3, 2015
		/s/  JOSÉ R. MAS
		José R. Mas
		Chief Executive Officer
		(Principal Executive Officer)
		/s/  GEORGE L. PITA
		George L. Pita
		Chief Financial Officer
		(Principal Financial and Accounting Officer)

49

Exhibit Index

Exhibit No.	Description
12.1*	Computation of Ratio of Earnings to Fixed Charges
31.1*	Certifications required by Section 302(a) of the Sarbanes-Oxley Act of 2002
31.2*	Certifications required by Section 302(a) of the Sarbanes-Oxley Act of 2002
32.1**	Certifications required by Section 906 of the Sarbanes-Oxley Act of 2002
32.2**	Certifications required by Section 906 of the Sarbanes-Oxley Act of 2002
101.INS*	XBRL Instance Document
101.SCH*	XBRL Taxonomy Extension Schema
101.CAL*	XBRL Taxonomy Extension Calculation Linkbase
101.DEF*	XBRL Taxonomy Extension Definition Linkbase
101.LAB*	XBRL Taxonomy Extension Label Linkbase
101.PRE*	XBRL Taxonomy Extension Presentation Linkbase

______________

* Filed herewith.

** Furnished herewith.

50

EX-12.1

Exhibit 12.1

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

(dollar amounts in thousands)

	For the Nine Months Ended September 30,
	2015			2014
				As Restated
Earnings:
Income from continuing operations before income taxes	$	522		$	154,016
Add: Fixed charges	105,780			102,384
Less: Undistributed losses from equity method investees	(3,594		)	(276		)
Total earnings	$	109,896		$	256,676
Fixed charges:
Interest expense	$	36,320		$	37,695
Estimate of interest expense within rental expense	69,460			64,689
Total fixed charges	$	105,780		$	102,384
Ratio of earnings to fixed charges	1.0			2.5

EX-31.1

Exhibit 31.1

CERTIFICATIONS REQUIRED BY SECTION 302(A)

OF SARBANES-OXLEY ACT OF 2002

I, José R. Mas, certify that:

I have reviewed this quarterly report on Form 10-Q of MasTec, Inc.;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this quarterly report;

Based on my knowledge, the financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this quarterly report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this quarterly report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this quarterly report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this quarterly report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 3, 2015
		/s/ José R. Mas
		José R. Mas          Chief Executive Officer (Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATIONS REQUIRED BY SECTION 302(A)

OF SARBANES-OXLEY ACT OF 2002

I, George L. Pita, certify that:

I have reviewed this quarterly report on Form 10-Q of MasTec, Inc.;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this quarterly report;

Based on my knowledge, the financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this quarterly report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this quarterly report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this quarterly report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this quarterly report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 3, 2015
		/s/ George L. Pita
		George L. Pita Chief Financial Officer (Principal Financial and Accounting Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of MasTec, Inc. (the “Company”) on Form 10-Q for the period ended September 30, 2015 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, José R. Mas, Chief Executive Officer of MasTec, Inc., certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	November 3, 2015
		/s/ José R. Mas
		José R. Mas Chief Executive Officer (Principal Executive Officer)

The certification set forth above is being furnished as an exhibit solely pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and is not being filed as part of the Quarterly Report on Form 10-Q for the period ended September 30, 2015, or as a separate disclosure document of the Company or the certifying officers.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of MasTec, Inc. (the “Company”) on Form 10-Q for the period ended September 30, 2015 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, George L. Pita, Chief Financial Officer of MasTec, Inc., certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	November 3, 2015
		/s/ George L. Pita
		George L. Pita Chief Financial Officer (Principal Financial and Accounting Officer)

The certification set forth above is being furnished as an exhibit solely pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and is not being filed as part of the Quarterly Report on Form 10-Q for the period ended September 30, 2015, or as a separate disclosure document of the Company or the certifying officers.

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Earnings Per Share [Line Items]
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Earnings Per Share [Line Items]
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Common Stock [Member] | 4.0% Convertible Notes [Member]
Earnings Per Share [Line Items]
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Common Stock [Member] | Common Stock Equivalents Excluded Due To Net Loss [Member]
Earnings Per Share [Line Items]
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Fair Value of Financial Instruments (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Narrative) (Details) - Earn-Out Arrangements [Member] - USD ($)	3 Months Ended		9 Months Ended
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Foreign Currency Translation Adjustments [Member]
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
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Other Income [Member]
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
Reduction in ASC 805 contingent consideration, gain included in earnings	4,400,000		8,000,000
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Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
ASC 805 contingent consideration, fair value	$ 94,000,000		$ 94,000,000		$ 146,100,000
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Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
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Business Combinations [Line Items]
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Business Combinations [Line Items]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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Fair Value of Financial Instruments (Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis) (Narrative) (Details) $ in Millions	1 Months Ended	9 Months Ended
	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Pipeline Joint Ventures [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investment, ownership percentage		33.00%
Equity Method Investee [Member] | Pipeline Joint Ventures [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investment, amount of investment (in dollars)	$ 6.0	$ 51.0
Number of equity method investments acquired	2
Number of pipelines to be constructed	2
Equity Method Investee [Member] | Pipeline Joint Ventures [Member] | Equity Contributions and/or Loan Guarantees [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Unconsolidated affiliates, outstanding commitments (in dollars)	$ 78.0
Fair Value, Measurements, Non-Recurring [Member] | Carrying Amount [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Cost and equity method investments, including long-term receivables from investees and contractual joint ventures, aggregate carrying value (in dollars)		$ 68.0	$ 17.7
Senior Notes [Member] | 4.875% Senior Notes [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Debt instrument, interest rate (percentage)		4.875%
Senior Notes [Member] | 4.875% Senior Notes [Member] | Fair Value, Measurements, Non-Recurring [Member] | Level 1 [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Fair value measurements, valuation techniques		the estimated fair value of the Company’s 4.875% Senior Notes, based on quoted market prices in active markets, a Level 1 input
Senior Notes [Member] | 4.875% Senior Notes [Member] | Fair Value, Measurements, Non-Recurring [Member] | Carrying Amount [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
4.875% Senior Notes (in dollars)		$ 400.0	400.0
Senior Notes [Member] | 4.875% Senior Notes [Member] | Fair Value, Measurements, Non-Recurring [Member] | Fair Value [Member] | Level 1 [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
4.875% Senior Notes (in dollars)		$ 332.0	$ 375.0

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Other Retirement Plans (Narrative) (Details)	9 Months Ended
	Sep. 30, 2015
Multiemployer Plans [Abstract]
Multi-employer plans, general nature	Certain of MasTec’s subsidiaries, including certain subsidiaries in Canada, contribute amounts to multi-employer pension and other multi-employer benefit plans and trusts, which are recorded as a component of employee wages and salaries within costs of revenue, excluding depreciation and amortization. Contributions are generally based on fixed amounts per hour per employee for employees covered under these plans. Multi-employer plan contribution rates are determined annually and assessed on a “pay-as-you-go” basis based on union employee payrolls. Union payrolls cannot be determined for future periods because the number of union employees employed at any given time, and the plans in which they may participate, vary depending upon the location and number of ongoing projects at a given time and the need for union resources in connection with those projects.

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Acquisitions (2014 Acquisitions - Pacer) (Narrative) (Details)	1 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	May. 31, 2015 USD ($)	Sep. 30, 2015 CAD	Sep. 30, 2015 USD ($)	Dec. 31, 2014 CAD	Dec. 31, 2014 USD ($)	Jun. 01, 2014 USD ($)
Business Combinations [Line Items]
Other current liabilities, equity method investments (in dollars)							$ 34,341,000		$ 66,527,000
Prepaid expenses and other current assets, equity method investments							116,985,000		91,336,000
Performance Guarantees [Member]
Business Combinations [Line Items]
Guarantees issued, related parties							$ 553,700,000		748,300,000
Pacer [Member]
Business Combinations [Line Items]
Business combinations, effective date				Jun. 01, 2014
Business combinations, percentage of voting interests acquired						100.00%	100.00%
Business combinations, name of acquired entity				Pacer Construction Holdings Corporation and its affiliated operating companies (collectively, “Pacer”)
Business combinations, description of acquired entity				Pacer is a western Canadian civil construction services company, headquartered in Calgary, Alberta, Canada.  Pacer’s services include infrastructure construction primarily in support of oil and gas production, processing, mining and transportation.
Business combinations, goodwill recognized, description				Goodwill arising from the acquisition represents the estimated value of Pacer’s geographic presence in key high-growth Canadian markets, its assembled workforce, its management team’s industry-specific project management expertise and synergies expected to be achieved from the combined operations of Pacer and MasTec.
Business combinations, goodwill, expected tax deductible amount										$ 0
Pacer [Member] | Earn-Out Arrangements [Member]
Business Combinations [Line Items]
Business combinations, contingent consideration arrangements, basis for amount				The contingent consideration included in the table above equals 25% of the excess, if any, of Pacer’s earnings from continuing operations before interest, taxes, depreciation and amortization (“EBITDA”) above certain thresholds for a five-year period, as set forth in the purchase agreement, and is payable annually in Canadian dollars.
Business combinations, contingent consideration, percentage of excess EBITDA				25.00%
Business combinations, contingent consideration, earn-out period (in years)				5 years
Business combinations, contingent consideration, fair value measurements, significant assumptions				The fair value of the earn-out liability was estimated using an income approach and incorporates significant inputs not observable in the market. Key assumptions in the estimated valuation include the discount rate and probability-weighted EBITDA projections.
Business combination, contingent consideration arrangements, range of outcomes, value, low | CAD						CAD 0
Business combination, contingent consideration arrangements, range of outcomes, value, high | CAD						71,000,000
Business combination, contingent consideration arrangements, range of outcomes, maximum unlimited				there is no maximum earn-out payment amount
Pacer [Member] | Joint Venture [Member] | Performance Guarantees [Member]
Business Combinations [Line Items]
Guarantees issued, related parties | CAD						CAD 132,100,000		CAD 132,100,000
Pacer [Member] | Joint Venture [Member] | Other [Member] | Performance Guarantees [Member]
Business Combinations [Line Items]
Construction projects, percentage complete						65.00%	65.00%
Pacer [Member] | Equity Method Investee [Member] | Pacer Equity Method Investee in Receivership [Member]
Business Combinations [Line Items]
Equity method investment, expected collection period (in years)				12 months
Pacer [Member] | Equity Method Investee [Member] | Additional Pacer Equity Method Investee in Receivership [Member]
Business Combinations [Line Items]
Equity method investment, expected collection period (in years)				12 months
Pacer [Member] | Equity Method Investee [Member] | Financial Support [Member] | Pacer Equity Method Investee in Receivership [Member]
Business Combinations [Line Items]
Unconsolidated affiliates, outstanding commitments | CAD						CAD 78,000,000
Pacer [Member] | Canadian Dollars [Member]
Business Combinations [Line Items]
Business combinations, provisional information, initial accounting Incomplete, adjustment, property and equipment					$ 8,400,000
Business combinations, provisional information, initial accounting incomplete, adjustment, goodwill					47,500,000
Pacer [Member] | Canadian Dollars [Member] | Earn-Out Arrangements [Member]
Business Combinations [Line Items]
Business combination, contingent consideration arrangements, range of outcomes, value, low							$ 0
Business combination, contingent consideration arrangements, range of outcomes, value, high							54,000,000
Pacer [Member] | Canadian Dollars [Member] | Equity Method Investments [Member]
Business Combinations [Line Items]
Net equity method investment obligations, financing arrangements										31,000,000
Pacer [Member] | Canadian Dollars [Member] | Current Liabilities [Member]
Business Combinations [Line Items]
Business combinations, provisional information, initial accounting incomplete, adjustment, liabilities					5,600,000
Pacer [Member] | Canadian Dollars [Member] | Long-Term Deferred Tax Liabilities [Member]
Business Combinations [Line Items]
Business combinations, provisional information, initial accounting incomplete, adjustment, liabilities					1,200,000
Pacer [Member] | Canadian Dollars [Member] | Equity Method Investments [Member]
Business Combinations [Line Items]
Business combinations, provisional information, initial accounting incomplete, adjustment, assets					$ (49,000,000)
Pacer [Member] | Canadian Dollars [Member] | Financial Support [Member] | Equity Method Investments [Member]
Business Combinations [Line Items]
Net equity method investment obligations, financing arrangements										$ 8,600,000
Pacer [Member] | Canadian Dollars [Member] | Joint Venture [Member]
Business Combinations [Line Items]
Revenue, related parties, affiliates		$ 300,000		$ 1,800,000
Pacer [Member] | Canadian Dollars [Member] | Joint Venture [Member] | Financial Support [Member]
Business Combinations [Line Items]
Financing commitments, amounts paid				8,200,000
Unconsolidated affiliates, outstanding commitments							0		0
Pacer [Member] | Canadian Dollars [Member] | Joint Venture [Member] | Accounts Receivable [Member]
Business Combinations [Line Items]
Receivables, related parties, unincorporated joint venture							1,100,000		1,800,000
Pacer [Member] | Canadian Dollars [Member] | Joint Venture [Member] | Performance Guarantees [Member]
Business Combinations [Line Items]
Guarantees issued, related parties							99,200,000		113,600,000
Pacer [Member] | Canadian Dollars [Member] | Joint Venture [Member] | Other [Member] | Contracts Accounted for under Percentage-of-Completion [Member]
Business Combinations [Line Items]
Project losses (in dollars)		2,800,000		8,300,000
Pacer [Member] | Canadian Dollars [Member] | Equity Method Investee [Member]
Business Combinations [Line Items]
Revenue, related parties, affiliates		1,600,000		3,100,000
Pacer [Member] | Canadian Dollars [Member] | Equity Method Investee [Member] | Additional Pacer Equity Method Investee in Receivership [Member] | Maximum [Member]
Business Combinations [Line Items]
Equity method investment, net assets							1,000,000
Pacer [Member] | Canadian Dollars [Member] | Equity Method Investee [Member] | Financial Support [Member]
Business Combinations [Line Items]
Financing commitments, amounts paid				$ 10,200,000
Unconsolidated affiliates, outstanding commitments							0		0
Pacer [Member] | Canadian Dollars [Member] | Equity Method Investee [Member] | Financial Support [Member] | Pacer Equity Method Investee in Receivership [Member]
Business Combinations [Line Items]
Financing commitments, amounts paid			$ 38,300,000
Unconsolidated affiliates, outstanding commitments							58,600,000
Unconsolidated affiliates, financing commitments, amounts repaid		$ 12,800,000
Prepaid expenses and other current assets, equity method investments							23,100,000
Pacer [Member] | Canadian Dollars [Member] | Equity Method Investee [Member] | Accounts Receivable [Member]
Business Combinations [Line Items]
Receivables, related parties, equity method investee							1,600,000
Pacer [Member] | Canadian Dollars [Member] | Equity Method Investee [Member] | Performance Guarantees [Member]
Business Combinations [Line Items]
Guarantees issued, related parties							30,700,000		61,200,000
Pacer [Member] | Canadian Dollars [Member] | Equity Method Investee [Member] | Other Financial Guarantees [Member]
Business Combinations [Line Items]
Guarantees issued, related parties							$ 2,200,000		3,000,000
Pacer [Member] | Canadian Dollars [Member] | Equity Method Investee [Member] | Guarantee of Indebtedness of Others [Member] | Current Liabilities [Member]
Business Combinations [Line Items]
Other current liabilities, equity method investments (in dollars)									$ 22,600,000
Pacer [Member] | Canadian Dollars [Member] | Equity Method Investee [Member] | Guarantee of Indebtedness of Others [Member] | Financial Support [Member] | Revolving Loans [Member]
Business Combinations [Line Items]
Financing commitments, amounts paid	$ 20,800,000

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Equity (Tables)

9 Months Ended

Sep. 30, 2015

Equity [Abstract]

Schedule of Share Activity

Share Activity (in thousands):	Common Shares Outstanding		Treasury Shares
Balance as of December 31, 2014	84,739		2,876
Shares issued:
Stock option exercises	72
Restricted share awards	199
Common stock repurchases	(5,218	)	5,218
Other, net	65
Balance as of September 30, 2015	79,857		8,094

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Other Retirement Plans (Schedule of Covered Employees and Contributions, Multi-Employer Plans) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) employee	Sep. 30, 2014 USD ($) employee	Sep. 30, 2015 USD ($) employee	Sep. 30, 2014 USD ($) employee
Covered Employees and Contributions, Multi-Employer Plans [Line Items]
Multi-employer plans, contributions (in dollars)	$ 9.6	$ 12.7	$ 26.6	$ 29.8
Multi-Employer Plans, Pension [Member]
Covered Employees and Contributions, Multi-Employer Plans [Line Items]
Multi-employer plans, contributions (in dollars)	7.4	11.6	20.0	27.3
Multi-Employer Plans, Postretirement Benefit [Member]
Covered Employees and Contributions, Multi-Employer Plans [Line Items]
Multi-employer plans, contributions (in dollars)	$ 2.2	$ 1.1	$ 6.6	$ 2.5
Workforce Subject to Collective Bargaining Arrangements [Member] | Unionized Employees [Member] | Low [Member]
Covered Employees and Contributions, Multi-Employer Plans [Line Items]
Multi-employer plans, covered employees (in number of employees) | employee	1,689	2,029	590	1,098
Workforce Subject to Collective Bargaining Arrangements [Member] | Unionized Employees [Member] | High [Member]
Covered Employees and Contributions, Multi-Employer Plans [Line Items]
Multi-employer plans, covered employees (in number of employees) | employee	2,463	2,167	2,463	2,167

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Stock-Based Compensation and Other Employee Benefit Plans (Stock Options) (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercised, intrinsic value (in dollars)	$ 0.7	$ 6.5
Stock options exercised, proceeds (in dollars)	$ 0.4	$ 0.8
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation awards, stock options, vested (percentage)	100.00%

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Segments and Related Information (Foreign Operations) (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segments and Related Information [Line Items]
Revenue			$ 1,111,010	$ 1,315,488	$ 3,180,906	$ 3,380,538
Property and equipment, net	$ 586,993	$ 623,118	586,993		586,993
Intangible assets and goodwill, net	$ 1,283,600	$ 1,332,800	1,283,600		1,283,600
Accounts Receivable, Net, Less Billings in Excess of Costs and Earnings [Member] | Credit Concentration Risk [Member] | Foreign Customers [Member]
Segments and Related Information [Line Items]
Concentration risk, percentage of total	16.00%	20.00%
United States [Member]
Segments and Related Information [Line Items]
Revenue			1,000,000	1,100,000	2,700,000	2,900,000
Property and equipment, net	$ 482,400	$ 494,100	482,400		482,400
Intangible assets and goodwill, net	1,100,000	1,100,000	1,100,000		1,100,000
Foreign Operations [Member]
Segments and Related Information [Line Items]
Revenue			115,200	$ 219,700	451,200	$ 460,300
Property and equipment, net	104,600	129,000	104,600		104,600
Intangible assets and goodwill, net	$ 193,900	$ 227,700	$ 193,900		$ 193,900

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Accounts Receivable, Net of Allowance (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Change in Accounting Estimate [Line Items]
Provisions for doubtful accounts	$ 1.4	$ 0.3	$ 2.2	$ 1.1
Financing Receivable [Member]
Change in Accounting Estimate [Line Items]
Increase in cash collections from non-recourse financing arrangement			29.0
Financing Receivable [Member] | Interest Expense [Member]
Change in Accounting Estimate [Line Items]
Non-recourse financing arrangement, discount charge			$ 1.1
Uncollectible Receivables [Member]
Change in Accounting Estimate [Line Items]
Change in estimate, provision for doubtful accounts				$ 0.5

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Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Activity, Employee Stock Purchase Plans) (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Common Stock [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Common shares issued (in shares)	86,687	94,761
Employee Stock Purchase Plans [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Cash proceeds (in dollars)	$ 1.3	$ 2.5
Employee Stock Purchase Plans [Member] | Common Stock [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Weighted average price per share (in dollars per share)	$ 15.33	$ 26.60
Weighted average per share grant date fair value (in dollars per share)	$ 4.20	$ 6.34

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Segments and Related Information (Schedule of Financial Information by Reportable Segment - EBITDA - Continuing Operations) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
EBITDA - Continuing Operations:
EBITDA - Continuing operations	$ 67.8	$ 134.2	$ 164.4	$ 303.6
Reportable Segments [Member] | Communications [Member]
EBITDA - Continuing Operations:
EBITDA - Continuing operations	49.7	52.5	141.8	153.7
Reportable Segments [Member] | Oil and Gas [Member]
EBITDA - Continuing Operations:
EBITDA - Continuing operations	51.0	73.4	113.9	144.2
Reportable Segments [Member] | Electrical Transmission [Member]
EBITDA - Continuing Operations:
EBITDA - Continuing operations	(23.7)	18.5	(47.6)	35.1
Reportable Segments [Member] | Power Generation and Industrial [Member]
EBITDA - Continuing Operations:
EBITDA - Continuing operations	4.8	4.9	3.9	9.4
Reportable Segments [Member] | Other [Member]
EBITDA - Continuing Operations:
EBITDA - Continuing operations	(2.0)	(0.7)	(7.1)	(0.1)
Corporate [Member]
EBITDA - Continuing Operations:
EBITDA - Continuing operations	$ (12.0)	$ (14.4)	$ (40.5)	$ (38.7)

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Equity (Schedule of Share Activity) (Details)	9 Months Ended
	Sep. 30, 2015 shares
Share Activity:
Common shares outstanding, beginning balance	84,739,000
Treasury shares, beginning balance	2,876,311
Shares issued:
Common shares outstanding, ending balance	79,857,000
Treasury shares, ending balance	8,094,004
Common Stock [Member]
Shares issued:
Stock option exercises	71,971
Restricted share awards	199,000
Other, net	65,000
Common Stock [Member] | 2014 Share Repurchase Program [Member]
Shares issued:
Common stock repurchases	(5,218,000)
Treasury shares, common stock repurchases	5,218,000

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Segments and Related Information (Schedule of Financial Information by Reportable Segment - Depreciation and Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Depreciation and Amortization:
Depreciation and amortization	$ 42,196	$ 41,747	$ 128,048	$ 111,996
Reportable Segments [Member] | Communications [Member]
Depreciation and Amortization:
Depreciation and amortization	13,200	10,100	37,600	30,100
Reportable Segments [Member] | Oil and Gas [Member]
Depreciation and Amortization:
Depreciation and amortization	20,000	23,300	64,300	61,300
Reportable Segments [Member] | Electrical Transmission [Member]
Depreciation and Amortization:
Depreciation and amortization	5,500	5,200	16,000	11,900
Reportable Segments [Member] | Power Generation and Industrial [Member]
Depreciation and Amortization:
Depreciation and amortization	1,700	1,700	5,000	4,800
Reportable Segments [Member] | Other [Member]
Depreciation and Amortization:
Depreciation and amortization	0	0	100	0
Corporate [Member]
Depreciation and Amortization:
Depreciation and amortization	$ 1,800	$ 1,400	$ 5,000	$ 3,900

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Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Non-Cash Stock-Based Compensation Expense and Related Tax Benefits) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Non-cash stock-based compensation expense				$ 9,486	$ 11,584
Income Tax Effects:
Income tax benefit from non-cash stock-based compensation		$ 1,200	$ 1,800	3,700	8,400
Excess tax benefit from non-cash stock-based compensation	[1]	0	100	56	3,494
General and Administrative Expenses [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Non-cash stock-based compensation expense		$ 3,200	$ 4,100	$ 9,500	$ 11,600

[1] Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with exercised stock options and vested restricted shares, are classified as financing cash flows in the Company’s condensed unaudited consolidated statements of cash flows.

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Stock-Based Compensation and Other Employee Benefit Plans (Restricted Shares) (Narrative) (Details) - Restricted Shares [Member] - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation awards, unearned compensation	$ 16.8	$ 16.8		$ 16.8
Stock-based compensation awards, unearned compensation, weighted average expected recognition period (in years)	1 year 7 months 6 days
Stock-based compensation, vested awards, intrinsic value		$ 0.2	$ 1.1	$ 3.7	$ 7.1

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Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Line Items]

Schedule of Earnings Per Share Information

The following table provides details underlying the Company’s earnings per share calculations for the periods indicated (in thousands):

	For the Three Months Ended September 30,					For the Nine Months Ended September 30,
	2015		2014			2015			2014
			As Restated						As Restated
Net income (loss) attributable to MasTec:
Net income (loss), continuing operations - basic (a)	$	7,618	$	49,306		$	(2,346	)	$	95,399
Interest expense, net of tax, convertible notes	—		20			—			166
Net income (loss), continuing operations - diluted	$	7,618	$	49,326		$	(2,346	)	$	95,565
Net loss from discontinued operations - basic and diluted (a)	—		(320		)	—			(592		)
Net income (loss) attributable to MasTec - diluted	$	7,618	$	49,006		$	(2,346	)	$	94,973
Weighted average shares outstanding:
Weighted average shares outstanding - basic	79,845		81,811			80,681			79,158
Dilutive common stock equivalents	603		814			—			798
Dilutive shares, convertible notes	—		3,199			—			6,460
Weighted average shares outstanding - diluted	80,448		85,824			80,681			86,416

(a) Calculated as total net income (loss) less amounts attributable to non-controlling interests.

2011 4.25% Notes [Member]

Earnings Per Share [Line Items]

Schedule of Convertible Notes Premium Share Information

The calculations underlying the number of premium shares included in the Company’s diluted share count for the periods indicated were as follows (in thousands, except per share amounts):

	2011 4.25% Notes
Premium Share Information:	For the Three Months Ended September 30, 2014		For the Nine Months Ended September 30, 2014
Number of conversion shares, principal amount	6,268		6,268
Per share price, actual average	$	29.73	$	35.06
Premium value	$	89,341	$	122,748
Premium shares	3,005		3,501

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Acquisitions (Schedule of Business Acquisition Pro Forma Information, Business Acquisitions) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Combinations [Line Items]
Business combinations, pro forma information, description				The unaudited supplemental pro forma financial information presented below has been prepared by adjusting the historical results of MasTec to include the historical results of the acquired businesses described above and was then adjusted (i) to remove acquisition costs, including certain acquisition integration costs; (ii) to increase amortization expense resulting from the incremental intangible assets acquired; (iii) to increase interest expense as a result of the cash consideration paid; (iv) to remove integration-related employee redundancy costs; and (v) to reduce interest expense from debt repaid upon acquisition of the respective businesses. The unaudited supplemental pro forma financial information does not include adjustments to reflect the impact of other cost savings or synergies that may result from these acquisitions.
Unaudited Pro Forma Financial Information and Results of Businesses Acquired
Business combinations, pro forma revenue			$ 1,423.5		$ 3,854.0
Business combinations, pro forma net income from continuing operations			50.6		100.2
Business combinations, actual of acquirees, revenue (year-over-year impact)		$ 69.2	133.2	$ 301.5	342.5
Business combinations, actual of acquirees, net income (loss) from continuing operations (year-over-year impact)	[1]	0.2	2.3	(13.4)	4.3
General and Administrative Expenses [Member]
Unaudited Pro Forma Financial Information and Results of Businesses Acquired
Business combinations, acquisition and integration-related costs		1.9		10.3
Business combinations, other acquisition-related costs			$ 0.5		$ 2.0
Communications [Member]
Unaudited Pro Forma Financial Information and Results of Businesses Acquired
Business combinations, acquisition integration costs		1.2		17.8
Communications [Member] | General and Administrative Expenses [Member]
Unaudited Pro Forma Financial Information and Results of Businesses Acquired
Business combinations, acquisition integration costs		1.2		17.8
Communications [Member] | WesTower [Member] | General and Administrative Expenses [Member]
Unaudited Pro Forma Financial Information and Results of Businesses Acquired
Business combinations, acquisition integration costs				9.3
Other [Member] | Pacer [Member] | Joint Venture [Member] | Canadian Dollars [Member] | Contracts Accounted for under Percentage-of-Completion [Member]
Unaudited Pro Forma Financial Information and Results of Businesses Acquired
Project losses		$ 2.8		$ 8.3

[1] Acquiree net income (loss) from continuing operations for the nine month period ended September 30, 2015 includes approximately $9.3 million of pre-tax acquisition integration costs incurred in connection with the WesTower acquisition, and for the three and nine month periods ended September 30, 2015, includes project losses of $2.8 million and $8.3 million, respectively, associated with the Company’s proportionate interest in a non-controlled Canadian joint venture. Other acquisition-related costs, including certain acquisition integration costs totaling $1.9 million and $10.3 million for the three and nine month periods ended September 30, 2015, respectively, and $0.5 million and $2.0 million for the three and nine month periods ended September 30, 2014, respectively, are not included in the above presented acquiree results for the respective periods. The above results also do not include interest expense associated with consideration paid for these acquisitions.

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Acquisitions (Narrative) (Details)	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Business combinations, provisional information, initial accounting incomplete, items	As of September 30, 2015, determination of the fair values of the net assets acquired, including the estimated values of contingent earn-out obligations and the estimated useful lives of acquired assets for the WesTower acquisition, as discussed below, were provisional and remained preliminary. Management continues to assess the valuation of these items and any ultimate purchase price adjustments that may result based on the final net assets and net working capital, as prescribed in the purchase agreement.
Business combinations, provisional information, initial accounting incomplete, reasons	During the measurement period, as defined under U.S. GAAP, the Company will revise its preliminary estimates of the fair values of net assets acquired if new information is obtained about the facts and circumstances existing as of the date of acquisition or for purchase price adjustments.

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Stock-Based Compensation and Other Employee Benefit Plans (Employee Stock Purchase Plans) (Narrative) (Details)	9 Months Ended
	Sep. 30, 2015
Employee Stock Purchase Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation plans, description	The Company has certain employee stock purchase plans (collectively “ESPPs”) under which shares of the Company's common stock are available for purchase by eligible employees.

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Related Party Transactions (Other Related Party Transactions) (Narrative) (Details) - Executive Officers [Member] - Related Customer [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Employee Leasing Arrangements [Member]
Related Party Transaction [Line Items]
Charges to related party	$ 0.2	$ 0.2	$ 0.6	$ 0.5
Due from related party	0.1		0.1		$ 0.1
Satellite Communication Services [Member]
Related Party Transaction [Line Items]
Revenue from related party	0.2	$ 0.3	0.7	$ 0.8
Accounts receivable, related party	$ 0.3		$ 0.3		$ 0.5

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Business, Basis of Presentation and Significant Accounting Policies (Restatement of Previously Reported Condensed Unaudited Consolidated Financial Statements) (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 1,111,010	$ 1,315,488	$ 3,180,906	$ 3,380,538
Income tax expense	6,197	30,319	3,288	58,569
Net income from continuing operations	$ 7,442	$ 49,445	$ (2,766)	$ 95,447
Continuing operations, basic earnings per share (in dollars per share)	$ 0.10	$ 0.60	$ (0.03)	$ 1.21
Continuing operations, diluted earnings per share (in dollars per share)	0.09	0.57	(0.03)	1.11
Total basic earnings per share (in dollars per share)	0.10	0.60	(0.03)	1.20
Total diluted earnings per share (in dollars per share)	$ 0.09	$ 0.57	$ (0.03)	$ 1.10
Other current liabilities	$ 34,341		$ 34,341		$ 66,527
Costs and earnings in excess of billings	356,000		356,000		485,600
Billings in excess of costs and earnings	$ 123,623		$ 123,623		$ 155,674
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax expense		$ 2,300		$ 900
Net income from continuing operations		$ 3,700		$ 1,500
Continuing operations, basic earnings per share (in dollars per share)		$ 0.04		$ 0.02
Continuing operations, diluted earnings per share (in dollars per share)		0.04		0.02
Total basic earnings per share (in dollars per share)		0.05		0.02
Total diluted earnings per share (in dollars per share)		$ 0.04		$ 0.02
Billings in excess of costs and earnings		$ (1,300)		$ (1,300)
Current taxes payable		900		900
Restatement Adjustment [Member] | Contracts Accounted for under Percentage-of-Completion [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		5,900		2,400
Costs and earnings in excess of billings		(4,200)		(4,200)
Restatement Adjustment [Member] | Contracts Accounted for under Percentage-of-Completion [Member] | Electrical Transmission [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Costs and earnings in excess of billings		1,100		1,100
Restatement Adjustment [Member] | Contracts Accounted for under Percentage-of-Completion [Member] | Reclassification Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other current liabilities		(5,300)		(5,300)
Costs and earnings in excess of billings		$ (5,300)		$ (5,300)

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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill [Line Items]
Goodwill, currency translation losses			$ 18,500,000	$ 4,700,000
Goodwill, additions from new business combinations			0	134,200,000
Amortization expense, intangible assets	$ 6,900,000	$ 6,600,000	21,500,000	17,000,000
Earn-Out Arrangements [Member]
Goodwill [Line Items]
Goodwill, accruals of acquisition-related contingent consideration			$ 800,000	$ 4,600,000

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Debt (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Other Accrued Expenses [Member]
Debt Instrument [Line Items]
Debt instrument, accrued interest payable	$ 2.7	$ 7.4

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Debt (Schedule of Carrying Values of Debt) (Interest Rates) (Details)	Sep. 30, 2015
Senior Notes [Member] | 4.875% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)	4.875%
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt instrument, weighted average interest rate (percentage)	2.80%
Notes Payable [Member] | Equipment [Member]
Debt Instrument [Line Items]
Debt instrument, weighted average interest rate (percentage)	2.70%

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Acquisitions (Schedule of Consideration Paid and Net Assets Acquired, Business Acquisitions - Pacer) (Details) - USD ($) $ in Thousands		9 Months Ended
	Jun. 01, 2014	Sep. 30, 2014	Sep. 30, 2015	Dec. 31, 2014
Identifiable assets acquired and liabilities assumed:
Goodwill			$ 1,064,822	$ 1,082,466
Earn-Out Arrangements [Member]
Acquisition consideration:
Fair value of contingent consideration (earn-out liability)		$ 33,612
Pacer [Member] | Canadian Dollars [Member]
Acquisition consideration:
Cash	$ 126,500
Total consideration transferred	150,800
Identifiable assets acquired and liabilities assumed:
Current assets, including $3.4 million of cash acquired	114,000
Business combinations, cash acquired	3,400
Property and equipment	81,200
Finite-lived intangible assets	19,400
Current liabilities, including current portion of capital lease obligations and long-term debt	(71,800)
Long-term debt, including capital lease obligations	(69,600)
Deferred income taxes	(30,500)
Total identifiable net assets	50,400
Goodwill	100,400
Total net assets acquired, including goodwill	150,800
Pacer [Member] | Canadian Dollars [Member] | Equity Method Investments [Member]
Identifiable assets acquired and liabilities assumed:
Net equity method investment obligations	(31,000)
Pacer [Member] | Canadian Dollars [Member] | Pre-Qualifications [Member]
Identifiable assets acquired and liabilities assumed:
Pre-qualifications	38,700
Pacer [Member] | Canadian Dollars [Member] | Earn-Out Arrangements [Member]
Acquisition consideration:
Fair value of contingent consideration (earn-out liability)	$ 24,300

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Acquisitions

9 Months Ended

Sep. 30, 2015

Business Combinations [Abstract]

Acquisitions

Note 3 – Acquisitions

The Company acquired several businesses during 2014, as discussed below and in Note 4 - Acquisitions in the notes to the Company’s audited consolidated financial statements included in its 2014 Form 10-K. As of September 30, 2015, determination of the fair values of the net assets acquired, including the estimated values of contingent earn-out obligations and the estimated useful lives of acquired assets for the WesTower acquisition, as discussed below, were provisional and remained preliminary. Management continues to assess the valuation of these items and any ultimate purchase price adjustments that may result based on the final net assets and net working capital, as prescribed in the purchase agreement.During the measurement period, as defined under U.S. GAAP, the Company will revise its preliminary estimates of the fair values of net assets acquired if new information is obtained about the facts and circumstances existing as of the date of acquisition or for purchase price adjustments. Such adjustments may result in the recognition of, or adjust the fair values of, acquired assets and assumed liabilities, and are presented as if the adjustments had been taken into account as of the date of acquisition, which would result in the revision of comparative prior period financial information. All changes that do not qualify as measurement period adjustments are included in current period results. As discussed under “New Accounting Pronouncements” in Note 1 - Business, Basis of Presentation and Significant Accounting Policies, ASU 2015-16 eliminates the requirement to retrospectively account for measurement period adjustments. The Company is currently evaluating the expected timing of application, and related impact of, adoption of this ASU on potential future measurement period adjustments.

2014 Acquisitions

WesTower

Effective October 1, 2014, MasTec acquired all of the issued and outstanding equity interests of WesTower Communications Inc. (“WesTower”). WesTower is a telecommunications services firm focusing on construction and maintenance of communications infrastructure related to wireless networks throughout the United States. WesTower, which provides services to a number of major wireless carriers throughout the Eastern, Central and Western United States, is expected to expand the Company’s geographical presence, market penetration and skilled employee base within its existing wireless operations. WesTower is reported within the Company’s Communications segment.

The following table summarizes the preliminary estimated fair values of consideration paid and identifiable assets acquired and liabilities assumed as of the date of acquisition (in millions):

Acquisition consideration:	October 1, 2014
Cash	$	198.0
Identifiable assets acquired and liabilities assumed:
Accounts receivable	$	180.6
Other current assets, including $18.0 million of cash acquired	50.3
Property, equipment and other long-term assets, including deferred tax asset	18.0
Finite-lived intangible assets	42.6
Billings in excess of costs and earnings	(33.3		)
Other current liabilities, including current portion of capital lease obligations	(89.8		)
Long-term liabilities, including capital lease obligations	(21.1		)
Total identifiable net assets	$	147.3
Goodwill	$	50.7
Total net assets acquired, including goodwill	$	198.0

The fair values and weighted average useful lives of WesTower’s acquired finite-lived intangible assets as of the date of acquisition were assigned as follows:

	Fair Value (in millions)		Weighted Average Useful Life (in years)
Finite-lived intangible assets:
Backlog	$	4.7	5
Trade name	1.1		4
Non-compete agreements	0.3		4
Customer relationships	36.5		18
Total acquired finite-lived intangible assets	$	42.6	16

Finite-lived intangible assets are amortized in a manner consistent with the pattern in which the related benefits are expected to be consumed. Goodwill arising from the acquisition represents the estimated value of WesTower’s geographic presence in key high growth markets, its assembled workforce and synergies expected to be achieved from the combined operations of WesTower and MasTec. The goodwill balance is not tax deductible.

In connection with the WesTower acquisition, the Company incurred acquisition integration costs of approximately $1.2 million and $17.8 million for the three and nine month periods ended September 30, 2015, respectively, which were included within general and administrative expenses within the condensed unaudited consolidated statements of operations. These acquisition integration costs consisted primarily of employee termination costs, including employee compensation relating to the elimination of certain positions, which were determined to be redundant, and other integration-type costs, including facility consolidation expenses, system migration expenses and training costs. As of September 30, 2015, the Company had substantially completed the integration of WesTower. As of September 30, 2015 and December 31, 2014, $1.7 million and $3.5 million, respectively, was included within current liabilities relating to acquisition integration costs. Liabilities assumed in connection with the WesTower acquisition also include the estimated value of certain off-market contracts, which are recognized in revenue over the terms of the related contracts.

Pacer

Effective June 1, 2014, MasTec acquired all of the issued and outstanding equity interests of Pacer Construction Holdings Corporation and its affiliated operating companies (collectively, “Pacer”). Pacer is a western Canadian civil construction services company, headquartered in Calgary, Alberta, Canada.  Pacer’s services include infrastructure construction primarily in support of oil and gas production, processing, mining and transportation. Pacer, a leading contractor in the Canadian oil sands market, is expected to enhance MasTec’s ability to develop energy infrastructure in western Canada and take advantage of associated opportunities in North America over the coming years. Pacer is primarily reported within the Company’s Oil and Gas segment.

The following table summarizes the estimated fair values of consideration paid and identifiable assets acquired and liabilities assumed, as adjusted, as of the date of acquisition (in millions):

Acquisition consideration:	June 1, 2014
Cash	$	126.5
Fair value of contingent consideration (earn-out liability)	24.3
Total consideration transferred	$	150.8
Identifiable assets acquired and liabilities assumed:
Current assets, including $3.4 million of cash acquired	$	114.0
Property and equipment	81.2
Pre-qualifications	38.7
Finite-lived intangible assets	19.4
Current liabilities, including current portion of capital lease obligations and long-term debt	(71.8		)
Net equity method investment obligations	(31.0		)
Long-term debt, including capital lease obligations	(69.6		)
Deferred income taxes	(30.5		)
Total identifiable net assets	$	50.4
Goodwill	$	100.4
Total net assets acquired, including goodwill	$	150.8

The values of certain of the assets acquired and liabilities assumed include the proportionate values of Pacer’s undivided interest in an unincorporated contractual joint venture, which is involved in a civil construction project and is accounted for on a proportional basis. Pacer’s undivided interest in this contractual joint venture automatically terminates upon completion of the project, which is not controlled by Pacer and is managed by a third party. This project, which was approximately 65% complete as of September 30, 2015, incurred losses for the three and nine month periods ended September 30, 2015 due to delayed receipt of a key material. Pacer’s proportionate share of these losses totaling $2.8 million and $8.3 million for the three and nine month periods ended September 30, 2015, respectively, are included in the Other segment. Pacer has minimal direct work involvement in this project. For the three and nine month periods ended September 30, 2015, revenue recognized by Pacer in connection with work performed for this contractual joint venture totaled $0.3 million and $1.8 million, respectively. As of September 30, 2015 and December 31, 2014, receivables from this contractual joint venture, including acquired receivables, totaled $1.1 million and $1.8 million, respectively. Performance guarantees associated with this contractual joint venture as of both September 30, 2015 and December 31, 2014 totaled Canadian $132.1 million (or approximately $99.2 million and $113.6 million, respectively), based on the full contract value of the project, for which Pacer is obligated on a joint and several basis with its other joint venture partner. In addition, from time to time, the Company may provide financing to this contractual joint venture. For the nine month period ended September 30, 2015, Pacer provided $8.2 million of financing to this contractual joint venture under financing arrangements. As of both September 30, 2015 and December 31, 2014, there were no additional amounts committed by Pacer to this contractual joint venture under such financing arrangements.

The equity method investment obligations identified in the table above represent investments in entities that provide civil construction services. As a result of the ongoing review of the acquired net assets of Pacer, the Company determined that the initial fair value assigned to these investments was in excess of their fair value and that it would cease participation in the operations of these equity method investments in 2015 upon completion of the existing projects. Subsequent to the acquisition date, the Company recorded a $49 million reduction to the acquisition date value of Pacer’s equity method investments to reflect their expected fair values as determined based on their expected net cash outflows, including the wind-down of its investments. For the three and nine month periods ended September 30, 2015, revenue recognized by the Company on behalf of these entities totaled $1.6 million and $3.1 million, respectively, of which $1.6 million was outstanding as of September 30, 2015. There are performance guarantees associated with these entities of a gross amount of approximately $30.7 million and $61.2 million as of September 30, 2015 and December 31, 2014, respectively, based on the full contract value of certain projects, for which Pacer is obligated on a joint and several basis with the other shareholders. As of September 30, 2015, all construction projects associated with these equity method investees were substantially complete. As of September 30, 2015 and December 31, 2014, excluding the receivership arrangements discussed below, there were approximately $2.2 million and $3.0 million, respectively, of other financial guarantees associated with these investments, for which Pacer is obligated on a joint and several basis, the durations of which correspond to those of the guaranteed transactions or borrowings. The Company believes these obligations and guarantees represent variable interests; however, Pacer does not have the power to control the primary activities of, nor is it the primary beneficiary of, these investments. In addition, from time to time, the Company may provide financing to its equity method investees. Pacer provided $10.2 million of such financing to its equity investees during the nine month period ended September 30, 2015, $8.6 million of which was reflected within Pacer’s net equity method investment obligations as of the date of acquisition. As of both September 30, 2015 and December 31, 2014, there were no additional amounts committed by Pacer to these entities under such financing arrangements.

In March 2015, as part of the initiative to wind down operations of one of its equity method investees, Pacer became the secured creditor thereof by purchasing the outstanding revolving credit facility of this investee for approximately $20.8 million in order to satisfy its obligations pursuant to a financial guarantee to the investee’s lender. This payment is included within Pacer’s net equity method investment obligations as of the date of acquisition in the table above, and as of December 31, 2014, approximately $22.6 million was included within other current liabilities in the Company’s consolidated balance sheet related to this financial guarantee. Subsequent to Pacer’s purchase of the outstanding credit facility, a receivership order was granted to assist with the orderly wind-down of the investee’s operations. As part of the receivership proceedings, Pacer committed to provide the receiver financing of up to Canadian $78.0 million (or approximately $58.6 million as of September 30, 2015), and through September 30, 2015, approximately $38.3 million of this financing commitment had been paid. During the third quarter of 2015, the receiver repaid the Company approximately $12.8 million of the $38.3 million advanced to receiver, and the remaining balance of $23.1 million, based on currency exchange rates as of September 30, 2015, was recorded within prepaid expenses and other current assets in the condensed unaudited consolidated balance sheet. Pacer does not expect to advance additional amounts to the receiver, and, based on operational estimates from the receiver, the Company believes Pacer will be repaid the remaining amounts advanced under the receivership financing commitment within the next twelve months, with a substantial portion expected to be collected in the fourth quarter of 2015. Additionally, in September 2015, a separate equity method investee of Pacer entered into a receivership arrangement to facilitate the wind-down of its operations. As of September 30, 2015, Pacer expected to receive the remaining net assets related to this investee, which total less than $1.0 million, within the next twelve months.

Subsequent to the acquisition date, in connection with the ongoing review of the acquired net working capital and acquired net assets of Pacer, the Company recorded an $8.4 million increase in property and equipment, a $5.6 million increase in certain current liabilities and a $1.2 million increase in long-term deferred tax liabilities. These adjustments, along with the adjustments to the equity method investment obligations discussed above, as well as other immaterial adjustments, net, in the acquisition date values of certain current assets and intangible assets, resulted in a $47.5 million increase in the acquisition date value of goodwill associated with the Pacer acquisition.

The fair values and weighted average useful lives of Pacer’s acquired finite-lived intangible assets, as adjusted, as of the date of acquisition were assigned as follows:

	Fair Value (in millions)		Weighted Average Useful Life (in years)
Finite-lived intangible assets:
Backlog	$	6.1	3
Non-compete agreements	2.3		9
Customer relationships	11.0		8
Total acquired finite-lived intangible assets	$	19.4	6

Finite-lived intangible assets are amortized in a manner consistent with the pattern in which the related benefits are expected to be consumed. The intangible asset related to Pacer’s pre-qualifications with selected customer companies has been assigned an indefinite life as the pre-qualifications are not expected to expire or diminish in value, and the companies to which they relate have extremely long operating histories. Goodwill arising from the acquisition represents the estimated value of Pacer’s geographic presence in key high-growth Canadian markets, its assembled workforce, its management team’s industry-specific project management expertise and synergies expected to be achieved from the combined operations of Pacer and MasTec. The goodwill balance is not tax deductible.

The contingent consideration included in the table above equals 25% of the excess, if any, of Pacer’s earnings from continuing operations before interest, taxes, depreciation and amortization (“EBITDA”) above certain thresholds for a five-year period, as set forth in the purchase agreement, and is payable annually in Canadian dollars.The fair value of the earn-out liability was estimated using an income approach and incorporates significant inputs not observable in the market. Key assumptions in the estimated valuation include the discount rate and probability-weighted EBITDA projections. Significant changes in any of these assumptions could result in a significantly higher or lower potential earn-out liability. The range of potential undiscounted payments that MasTec could be required to make under the earn-out arrangement is estimated to be between Canadian $0 and $71 million, or approximately $0 and $54 million as of September 30, 2015; however, there is no maximum earn-out payment amount. As is customary for purchase agreements in the industry, the earn-out agreement contains certain right of offset provisions, under which the Company may, under certain circumstances, offset against the earn-out liability working capital adjustments, indemnification claims and similar items owed from the former owners of the entity.

Other 2014 Acquisitions

Effective April 1, 2014, MasTec acquired 100% of a telecommunications services firm, specializing in the installation of in-home security systems, for an aggregate purchase price composed of approximately $16.3 million in cash, as adjusted for the final net working capital, and a five year earn-out, valued at $0.6 million as of September 30, 2015. Additionally, effective January 1, 2014, MasTec acquired 100% of a telecommunications services firm, specializing in the engineering, installation, furnishing and integration of telecommunications equipment, for an aggregate purchase price composed of approximately $23.8 million in cash and a five year earn-out, valued at $8.7 million as of September 30, 2015. These companies are included in MasTec’s Communications segment.

Unaudited Supplemental Pro Forma Information

The following unaudited supplemental pro forma financial information includes the results of operations of each of the companies acquired in 2014 and is presented as if each acquired company had been consolidated as of the beginning of the year immediately preceding the year in which the company was acquired. The unaudited supplemental pro forma financial information has been provided for illustrative purposes only and does not purport to be indicative of the actual results that would have been achieved by the combined companies for the periods presented, or of the results that may be achieved by the combined companies in the future. Future results may vary significantly from the results reflected in the following unaudited supplemental pro forma financial information because of future events and transactions, as well as other factors, many of which are beyond MasTec’s control.

The unaudited supplemental pro forma financial information presented below has been prepared by adjusting the historical results of MasTec to include the historical results of the acquired businesses described above and was then adjusted (i) to remove acquisition costs, including certain acquisition integration costs; (ii) to increase amortization expense resulting from the incremental intangible assets acquired; (iii) to increase interest expense as a result of the cash consideration paid; (iv) to remove integration-related employee redundancy costs; and (v) to reduce interest expense from debt repaid upon acquisition of the respective businesses. The unaudited supplemental pro forma financial information does not include adjustments to reflect the impact of other cost savings or synergies that may result from these acquisitions.

	For the Three Months Ended September 30, 2014		For the Nine Months Ended September 30, 2014
Unaudited pro forma financial information (in millions):
Revenue	$	1,423.5	$	3,854.0
Net income from continuing operations	$	50.6	$	100.2

Results of Businesses Acquired

Revenue and net income (loss) from continuing operations resulting from the year-over-year incremental impact of acquired businesses, which are included within the Company’s condensed unaudited consolidated results of operations for the periods indicated, were as follows (in millions):

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2015		2014		2015			2014
Actual of acquirees(year-over-year impact):			As Restated					As Restated
Revenue	$	69.2	$	133.2	$	301.5		$	342.5
Net income (loss) from continuing operations (a)	$	0.2	$	2.3	$	(13.4	)	$	4.3

(a) Acquiree net income (loss) from continuing operations for the nine month period ended September 30, 2015 includes approximately $9.3 million of pre-tax acquisition integration costs incurred in connection with the WesTower acquisition, and for the three and nine month periods ended September 30, 2015, includes project losses of $2.8 million and $8.3 million, respectively, associated with the Company’s proportionate interest in a non-controlled Canadian joint venture. Other acquisition-related costs, including certain acquisition integration costs totaling $1.9 million and $10.3 million for the three and nine month periods ended September 30, 2015, respectively, and $0.5 million and $2.0 million for the three and nine month periods ended September 30, 2014, respectively, are not included in the above presented acquiree results for the respective periods. The above results also do not include interest expense associated with consideration paid for these acquisitions.

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Debt (Senior Secured Credit Facility) (Narrative) (Details) - Credit Facility [Member]			1 Months Ended	9 Months Ended
	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2016	Sep. 30, 2016
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,250,000,000		$ 1,250,000,000	$ 1,250,000,000
Line of credit facility, maturity date				Oct. 29, 2018
Line of credit facility, deferred financing costs, net of accumulated amortization	7,000,000	$ 6,900,000	7,000,000	$ 7,000,000
Line of credit facility, letters of credit issued	$ 172,400,000	$ 153,600,000	172,400,000	$ 172,400,000
Line of credit facility, unused facility fee (percentage)	0.40%	0.35%
Line of credit facility, collateral				The Credit Facility is guaranteed by certain subsidiaries of the Company (the “Guarantor Subsidiaries”), and the obligations under the Credit Facility are secured by substantially all of the Company’s and the Guarantor Subsidiaries’ respective assets, subject to certain exceptions.
Line of credit facility, payments for consent fee			1,300,000
Maximum [Member]
Debt Instrument [Line Items]
Line of credit facility, revolving loan sublimit, Canadian dollars or Mexican pesos	$ 200,000,000		$ 200,000,000	$ 200,000,000
Line of credit facility, consolidated leverage ratio	4.25		4.25	4.25
Maximum [Member] | Forecast [Member]
Debt Instrument [Line Items]
Line of credit facility, consolidated leverage ratio					3.5	4
Revolving Loans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,000,000,000		$ 1,000,000,000	$ 1,000,000,000
Line of credit facility, remaining borrowing capacity	$ 478,300,000	$ 563,700,000	$ 478,300,000	$ 478,300,000
Revolving Loans [Member] | Weighted Average [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	2.50%	2.18%	2.50%	2.50%
Term Loan [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 250,000,000		$ 250,000,000	$ 250,000,000
Line of credit facility, maturity date				Nov. 21, 2019
Line of credit facility, term loan, frequency of payments				quarterly
Line of credit facility, term loan, date of first required payment				Mar. 31, 2016
Line of credit facility, interest rate (percentage)	2.19%	1.92%	2.19%	2.19%
Term Loan [Member] | Plan [Member]
Debt Instrument [Line Items]
Line of credit facility, term loan, amount of quarterly principal installment payments				$ 3,100,000
Term Loan [Member] | Maximum [Member]
Debt Instrument [Line Items]
Line of credit facility, revolving loan sublimit	$ 75,000,000		$ 75,000,000	75,000,000
Letters of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, capacity available for letters of credit	$ 277,600,000	$ 296,400,000	$ 277,600,000	$ 277,600,000
Letters of Credit [Member] | Performance Guarantees [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	1.00%	0.875%	1.00%	1.00%
Letters of Credit [Member] | Financial Standby [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	2.00%	1.75%	2.00%	2.00%
Letters of Credit [Member] | Maximum [Member]
Debt Instrument [Line Items]
Line of credit facility, capacity available for letters of credit	$ 450,000,000		$ 450,000,000	$ 450,000,000
Line of credit facility, capacity available for letters of credit sublimit, Canadian dollars or Mexican pesos	100,000,000		100,000,000	100,000,000
Option to Increase Revolving Commitments and/or Establish Additional Term Loan Tranches [Member] | Plan [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 250,000,000		$ 250,000,000	$ 250,000,000

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Acquisitions (2014 Acquisitions - WesTower) (Narrative) (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014	Oct. 01, 2014
Communications [Member]
Business Combinations [Line Items]
Business combinations, acquisition integration costs	$ 1,200,000	$ 17,800,000
Communications [Member] | General and Administrative Expenses [Member]
Business Combinations [Line Items]
Business combinations, acquisition integration costs	$ 1,200,000	$ 17,800,000
WesTower [Member]
Business Combinations [Line Items]
Business combinations, effective date		Oct. 01, 2014
Business combinations, percentage of voting interests acquired	100.00%	100.00%
Business combinations, name of acquired entity		WesTower Communications Inc. (“WesTower”)
Business combinations, description of acquired entity		WesTower is a telecommunications services firm focusing on construction and maintenance of communications infrastructure related to wireless networks throughout the United States. WesTower, which provides services to a number of major wireless carriers throughout the Eastern, Central and Western United States, is expected to expand the Company’s geographical presence, market penetration and skilled employee base within its existing wireless operations.
Business combinations, goodwill recognized, description		Goodwill arising from the acquisition represents the estimated value of WesTower’s geographic presence in key high growth markets, its assembled workforce and synergies expected to be achieved from the combined operations of WesTower and MasTec.
Business combinations, goodwill, expected tax deductible amount				$ 0
WesTower [Member] | Current Liabilities [Member]
Business Combinations [Line Items]
Business combinations, acquisition integration costs, current liabilities	$ 1,700,000	$ 1,700,000	$ 3,500,000
WesTower [Member] | Communications [Member] | General and Administrative Expenses [Member]
Business Combinations [Line Items]
Business combinations, acquisition integration costs		$ 9,300,000

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Property and Equipment, Net (Tables)

9 Months Ended

Sep. 30, 2015

Property, Plant and Equipment [Abstract]

Schedule of Property and Equipment, Net

The following table provides details of property and equipment, net, including property and equipment held under capital leases as of the dates indicated (in millions):

	September 30, 2015			December 31, 2014
Land	$	4.6		$	4.6
Buildings and leasehold improvements	21.0			19.9
Machinery and equipment	966.6			926.1
Office furniture and equipment	135.6			126.1
Construction in progress	10.8			12.0
Total property and equipment	$	1,138.6		$	1,088.7
Less accumulated depreciation and amortization	(551.6		)	(465.6		)
Property and equipment, net	$	587.0		$	623.1

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Accounts Receivable, Net of Allowance (Tables)

9 Months Ended

Sep. 30, 2015

Accounts Receivable [Member]

Schedule of Accounts Receivable, Net of Allowance [Line Items]

Schedule of Accounts Receivable, Net of Allowance

The following table provides details of accounts receivable, net of allowance, as of the dates indicated (in millions):

	September 30, 2015			December 31, 2014
Contract billings	$	512.3		$	669.7
Retainage	164.0			162.2
Costs and earnings in excess of billings	356.0			485.6
Accounts receivable, gross	$	1,032.3		$	1,317.5
Less allowance for doubtful accounts	(8.6		)	(13.9		)
Accounts receivable, net	$	1,023.7		$	1,303.6

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Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	$ 1,111,010	$ 1,315,488	$ 3,180,906	$ 3,380,538
Costs of revenue, excluding depreciation and amortization	972,711	1,122,861	2,805,072	2,914,901
Depreciation and amortization	42,196	41,747	128,048	111,996
General and administrative expenses	63,798	59,889	207,077	167,454
Interest expense (income), net	11,964	12,643	35,845	37,595
Other expense (income), net	6,702	(1,416)	4,342	(5,424)
Income from continuing operations before income taxes	13,639	79,764	522	154,016
Benefit from (provision for) income taxes	(6,197)	(30,319)	(3,288)	(58,569)
Net income (loss) from continuing operations	7,442	49,445	(2,766)	95,447
Net loss from discontinued operations	0	(320)	0	(592)
Equity in income (loss) from subsidiaries, net of tax	0	0	0	0
Net income (loss)	7,442	49,125	(2,766)	94,855
Net (loss) income attributable to non-controlling interests	(176)	139	(420)	48
Net income (loss) attributable to MasTec, Inc.	7,618	48,986	(2,346)	94,807
Comprehensive (loss) income	(5,888)	36,174	(34,816)	84,244
Reportable Legal Entities [Member] | MasTec, Inc. [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	0	0	0	0
Costs of revenue, excluding depreciation and amortization	0	0	0	0
Depreciation and amortization	0	0	0	0
General and administrative expenses	700	600	1,900	1,800
Interest expense (income), net	0	0	0	0
Other expense (income), net	0	0	0	0
Income from continuing operations before income taxes	(700)	(600)	(1,900)	(1,800)
Benefit from (provision for) income taxes	300	200	800	700
Net income (loss) from continuing operations	(400)	(400)	(1,100)	(1,100)
Net loss from discontinued operations		0		0
Equity in income (loss) from subsidiaries, net of tax	8,000	49,300	(1,300)	95,900
Net income (loss)	7,600	48,900	(2,400)	94,800
Net (loss) income attributable to non-controlling interests	0	0	0	0
Net income (loss) attributable to MasTec, Inc.	7,600	48,900	(2,400)	94,800
Comprehensive (loss) income	(5,700)	36,000	(34,400)	84,200
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	963,700	1,050,500	2,657,900	2,802,300
Costs of revenue, excluding depreciation and amortization	841,900	893,000	2,309,400	2,402,600
Depreciation and amortization	33,200	30,800	98,100	88,400
General and administrative expenses	57,000	50,800	184,900	146,700
Interest expense (income), net	27,700	11,500	82,900	35,600
Other expense (income), net	6,000	(1,700)	400	(5,900)
Income from continuing operations before income taxes	(2,100)	66,100	(17,800)	134,900
Benefit from (provision for) income taxes	1,300	(24,200)	7,900	(52,000)
Net income (loss) from continuing operations	(800)	41,900	(9,900)	82,900
Net loss from discontinued operations		0		0
Equity in income (loss) from subsidiaries, net of tax	0	0	0	0
Net income (loss)	(800)	41,900	(9,900)	82,900
Net (loss) income attributable to non-controlling interests	0	0	0	0
Net income (loss) attributable to MasTec, Inc.	(800)	41,900	(9,900)	82,900
Comprehensive (loss) income	(800)	41,900	(9,900)	83,000
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	149,900	267,000	530,200	580,300
Costs of revenue, excluding depreciation and amortization	133,400	231,900	502,900	514,400
Depreciation and amortization	9,000	10,900	29,900	23,600
General and administrative expenses	6,100	8,500	20,300	19,000
Interest expense (income), net	(15,700)	1,100	(47,100)	2,000
Other expense (income), net	700	300	4,000	400
Income from continuing operations before income taxes	16,400	14,300	20,200	20,900
Benefit from (provision for) income taxes	(7,800)	(6,400)	(12,000)	(7,300)
Net income (loss) from continuing operations	8,600	7,900	8,200	13,600
Net loss from discontinued operations		(300)		(500)
Equity in income (loss) from subsidiaries, net of tax	0	0	0	0
Net income (loss)	8,600	7,600	8,200	13,100
Net (loss) income attributable to non-controlling interests	(200)	100	(500)	(100)
Net income (loss) attributable to MasTec, Inc.	8,800	7,500	8,700	13,200
Comprehensive (loss) income	(4,800)	(5,300)	(23,700)	2,400
Eliminations [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	(2,600)	(2,000)	(7,200)	(2,100)
Costs of revenue, excluding depreciation and amortization	(2,600)	(2,000)	(7,200)	(2,100)
Depreciation and amortization	0	0	0	0
General and administrative expenses	0	0	0	0
Interest expense (income), net	0	0	0	0
Other expense (income), net	0	0	0	0
Income from continuing operations before income taxes	0	0	0	0
Benefit from (provision for) income taxes	0	0	0	0
Net income (loss) from continuing operations	0	0	0	0
Net loss from discontinued operations		0		0
Equity in income (loss) from subsidiaries, net of tax	(8,000)	(49,300)	1,300	(95,900)
Net income (loss)	(8,000)	(49,300)	1,300	(95,900)
Net (loss) income attributable to non-controlling interests	0	0	0	0
Net income (loss) attributable to MasTec, Inc.	(8,000)	(49,300)	1,300	(95,900)
Comprehensive (loss) income	$ 5,400	$ (36,400)	$ 33,300	$ (85,300)

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Accounts Receivable, Net of Allowance (Schedule of Accounts Receivable, Net of Allowance) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts Receivable, Net of Allowance
Contract billings	$ 512,300	$ 669,700
Retainage	164,000	162,200
Costs and earnings in excess of billings	356,000	485,600
Accounts receivable, gross	1,032,300	1,317,500
Less allowance for doubtful accounts	(8,600)	(13,900)
Accounts receivable, net	$ 1,023,663	$ 1,303,552

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Acquisitions (Schedule of Consideration Paid and Net Assets Acquired, Business Acquisitions - WesTower) (Details) - USD ($) $ in Thousands	Oct. 01, 2014	Sep. 30, 2015	Dec. 31, 2014
Identifiable assets acquired and liabilities assumed:
Goodwill		$ 1,064,822	$ 1,082,466
WesTower [Member]
Acquisition consideration:
Cash	$ 198,000
Acquisition consideration	198,000
Identifiable assets acquired and liabilities assumed:
Accounts receivable	180,600
Other current assets, including $18.0 million of cash acquired	50,300
Business combinations, cash acquired	18,000
Property, equipment and other long-term assets, including deferred tax asset	18,000
Finite-lived intangible assets	42,600
Billings in excess of costs and earnings	(33,300)
Other current liabilities, including current portion of capital lease obligations	(89,800)
Long-term liabilities, including capital lease obligations	(21,100)
Total identifiable net assets	147,300
Goodwill	50,700
Total net assets acquired, including goodwill	$ 198,000

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Debt (Tables)

9 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Schedule of Carrying Values of Debt

The following table provides details of the carrying values of debt as of the dates indicated (in millions):

Description	Maturity Date	September 30, 2015			December 31, 2014
Senior secured credit facility:
Revolving loans	October 29, 2018	$	349.3		$	282.7
Term loan	November 21, 2019	250.0			250.0
4.875% senior notes	March 15, 2023	400.0			400.0
Other credit facilities	Varies	9.5			1.2
Capital lease obligations, weighted average interest rate of 2.8%	In installments through June 13, 2021	148.1			176.5
Notes payable, equipment, weighted average interest rate of 2.7%	In installments through June 30, 2018	20.5			24.4
Total debt		$	1,177.4		$	1,134.8
Less current maturities		(78.8		)	(73.6		)
Long-term debt		$	1,098.6		$	1,061.2

Schedule of Interest Expense, Net

The following table provides details of interest expense, net, for the periods indicated (in millions):

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2015			2014			2015			2014
Interest expense:
Contractual and other interest expense (a)	$	11.3		$	11.3		$	34.3		$	31.6
Accretion of senior convertible note discount	—			0.6			—			3.4
Amortization of deferred financing costs	0.7			0.8			2.0			2.7
Total interest expense	$	12.0		$	12.7		$	36.3		$	37.7
Interest income	(0.0		)	(0.1		)	(0.5		)	(0.1		)
Interest expense, net	$	12.0		$	12.6		$	35.8		$	37.6

(a) Contractual and other interest expense for the nine month period ended September 30, 2015 includes $0.8 million of consent solicitation agent fees that were incurred in the second quarter of 2015 related to the delay in filing of the Company’s 2014 Form 10-K and its First Quarter 2015 Form 10-Q, as well as $1.1 million of discount fees related to financing arrangements.

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Stock-Based Compensation and Other Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2015

Share-based Compensation [Abstract]

Schedule of Activity, Restricted Shares

Activity, restricted shares:	Restricted Shares		Per Share Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2014	1,414,645		$	25.32
Granted	87,690		18.40
Vested	(199,235	)	18.22
Canceled/forfeited	(17,774	)	28.42
Non-vested restricted shares, as of September 30, 2015	1,285,326		$	25.90

Schedule of Activity, Stock Options

Activity, stock options:	StockOptions		Per Share Weighted AverageExercise Price		Weighted Average Remaining Contractual Life(in years)	Aggregate Intrinsic Value (a) (in millions)
Options outstanding and exercisable as of December 31, 2014	284,671		$	12.06	1.29	$	3.0
Exercised	(71,971	)	9.00
Options outstanding and exercisable as of September 30, 2015	212,700		$	13.10	0.79	$	0.6

(a) Amount represents the difference between the exercise price and the closing share price of the Company’s stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options.

Schedule of Activity, Employee Stock Purchase Plans

The following table provides details pertaining to the Company’s ESPPs for the periods indicated:

	For the Nine Months Ended September 30,
	2015		2014
Cash proceeds (in millions)	$	1.3	$	2.5
Common shares issued	86,687		94,761
Weighted average price per share	$	15.33	$	26.60
Weighted average per share grant date fair value	$	4.20	$	6.34

Schedule of Non-Cash Stock-Based Compensation Expense and Related Tax Benefits

Details of non-cash stock-based compensation expense and related tax benefits for the periods indicated were as follows (in millions):

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2015		2014		2015		2014
Non-cash stock-based compensation expense	$	3.2	$	4.1	$	9.5	$	11.6
Income Tax Effects:
Income tax benefit from non-cash stock-based compensation	$	1.2	$	1.8	$	3.7	$	8.4
Excess tax benefit from non-cash stock-based compensation (a)	$	0.0	$	0.1	$	0.1	$	3.5

(a) Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with exercised stock options and vested restricted shares, are classified as financing cash flows in the Company’s condensed unaudited consolidated statements of cash flows.

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Earnings Per Share

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Earnings Per Share

Note 2 – Earnings Per Share

Basic earnings or loss per share is computed by dividing net income or loss available to MasTec’s common shareholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share is computed by dividing net income available to MasTec’s common shareholders by the number of fully diluted shares, which includes the effect of dilutive potential issuances of common shares as determined using income from continuing operations, including the potential issuance of common shares upon the exercise, conversion or vesting of outstanding stock options and unvested restricted shares, as calculated under the treasury stock method, as well as shares associated with the Company’s convertible debt securities, which matured and were converted in 2014. If the Company reports a loss, rather than income, from continuing operations, the computation of diluted loss per share excludes dilutive common stock equivalents as their effect would be anti-dilutive. For the nine month period ended September 30, 2015, the Company reported a net loss from continuing operations, and 648,379 dilutive common shares were excluded from the calculation of diluted net loss per share for the related period. Therefore, diluted and basic earnings per share were the same in this period.

There were no anti-dilutive common stock equivalents for the three and nine month periods ended September 30, 2015, except for those excluded from the calculation of diluted net loss per share as discussed above. For the three and nine month periods ended September 30, 2014, there were 304,486 and 223,422 weighted average anti-dilutive common stock equivalents excluded from the calculation of diluted earnings per share because their effect would have been anti-dilutive.

The following table provides details underlying the Company’s earnings per share calculations for the periods indicated (in thousands):

	For the Three Months Ended September 30,					For the Nine Months Ended September 30,
	2015		2014			2015			2014
			As Restated						As Restated
Net income (loss) attributable to MasTec:
Net income (loss), continuing operations - basic (a)	$	7,618	$	49,306		$	(2,346	)	$	95,399
Interest expense, net of tax, convertible notes	—		20			—			166
Net income (loss), continuing operations - diluted	$	7,618	$	49,326		$	(2,346	)	$	95,565
Net loss from discontinued operations - basic and diluted (a)	—		(320		)	—			(592		)
Net income (loss) attributable to MasTec - diluted	$	7,618	$	49,006		$	(2,346	)	$	94,973
Weighted average shares outstanding:
Weighted average shares outstanding - basic	79,845		81,811			80,681			79,158
Dilutive common stock equivalents	603		814			—			798
Dilutive shares, convertible notes	—		3,199			—			6,460
Weighted average shares outstanding - diluted	80,448		85,824			80,681			86,416

(a) Calculated as total net income (loss) less amounts attributable to non-controlling interests.

Convertible Notes - Diluted Share Impact

In June 2014, $115 million aggregate principal amount of 4.0% senior convertible notes (the “4.0% Convertible Notes”) matured, at which time the holders elected to convert the notes. Upon conversion, the Company paid $105 million in cash and issued 4.2 million shares of common stock in respect thereof. The 4.0% Convertible Notes were composed of $105 million of 4.0% Convertible Notes issued in 2011 (the “2011 4.0% Notes”) and approximately $10 million of 4.0% Convertible Notes issued in 2009 (the “2009 4.0% Notes”). Additionally, in December 2014, $100 million aggregate principal amount of 4.25% senior convertible notes (the “4.25% Convertible Notes”) matured and were converted, and, upon conversion, the Company paid $97 million in cash and issued 2.4 million shares of common stock in respect of such notes. The 4.25% Convertible Notes were composed of $97 million of 4.25% Convertible Notes issued in 2011 (the “2011 4.25% Notes”) and $3 million of 4.25% Convertible Notes issued in 2009 (the “2009 4.25% Notes”). The 2009 4.0% Notes and the 2009 4.25% Notes are collectively referred to as the “2009 Convertible Notes,” and the 2011 4.0% Notes and the 2011 4.25% Notes are collectively referred to as the “2011 Convertible Notes.”

Until their maturity in 2014, dilutive shares associated with the 2009 Convertible Notes were attributable to the underlying principal amounts and were reflected in the calculation of weighted average diluted earnings per share for the corresponding periods by application of the “if-converted” method, whereas dilutive shares associated with the 2011 Convertible Notes were derived from the premium value of the notes in excess of their principal amounts, as calculated using the treasury stock method. These shares were referred to as the “premium shares.” The 4.25% Convertible Notes were convertible at $15.48 per share and the 4.0% Convertible Notes were convertible at $15.76 per share. The calculations underlying the number of premium shares included in the Company’s diluted share count for the periods indicated were as follows (in thousands, except per share amounts):

	2011 4.25% Notes
Premium Share Information:	For the Three Months Ended September 30, 2014		For the Nine Months Ended September 30, 2014
Number of conversion shares, principal amount	6,268		6,268
Per share price, actual average	$	29.73	$	35.06
Premium value	$	89,341	$	122,748
Premium shares	3,005		3,501

In addition to the premium shares described above, there were 2.4 million equivalent premium shares included in the Company's dilutive share calculation for the nine month period ended September 30, 2014 related to the 2011 4.0% Notes, as calculated based on the average price per share of the Company's common stock from the beginning of the period through June 15, 2014, the date of maturity.

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Other Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2015

Multiemployer Plans [Abstract]

Schedule of Covered Employees and Contributions, Multi-Employer Plans

Total contributions to multi-employer plans, and the related number of employees covered by these plans, including with respect to the Company’s Canadian operations, for the periods indicated were as follows:

	Multi-Employer Plans
	Covered Employees		Contributions (in millions)
	Low	High	Pension		Post-Retirement Benefit		Total
For the Three Months Ended September 30:
2015	1,689	2,463	$	7.4	$	2.2	$	9.6
2014	2,029	2,167	$	11.6	$	1.1	$	12.7
For the Nine Months Ended September 30:
2015	590	2,463	$	20.0	$	6.6	$	26.6
2014	1,098	2,167	$	27.3	$	2.5	$	29.8

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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Quarterly provision for income taxes, description	In determining the quarterly provision for income taxes, management uses an estimated annual effective tax rate based on forecasted annual pre-tax income, permanent tax differences, statutory tax rates and tax planning opportunities in the various jurisdictions in which the Company operates. The effect of significant discrete items is separately recognized in the quarter(s) in which they occur.
Current deferred tax assets, net	$ 26,900	$ 31,700
Long-term deferred tax liabilities, net	186,642	$ 203,476
Foreign Tax Authority [Member] | Alberta [Member]
Income Taxes [Line Items]
Income tax expense, cumulative revaluation of certain deferred tax liabilities	$ 2,600

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Earnings Per Share (Schedule of Earnings Per Share Information) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net income (loss) attributable to MasTec:
Net income (loss), continuing operations - basic (in dollars)	[1]	$ 7,618	$ 49,306	$ (2,346)	$ 95,399
Interest expense, net of tax, convertible notes (in dollars)		0	20	0	166
Net income (loss) attributable to MasTec - diluted (in dollars)		7,618	49,006	(2,346)	94,973
Net loss from discontinued operations - basic and diluted (in dollars)	[1]	$ 0	$ (320)	$ 0	$ (592)
Weighted average shares outstanding:
Weighted average shares outstanding - basic		79,845	81,811	80,681	79,158
Dilutive common stock equivalents (in shares)		603	814	0	798
Weighted average shares outstanding - diluted		80,448	85,824	80,681	86,416
Convertible Debt [Member]
Weighted average shares outstanding:
Dilutive shares, convertible notes		0	3,199	0	6,460
Continuing Operations [Member]
Net income (loss) attributable to MasTec:
Net income (loss) attributable to MasTec - diluted (in dollars)		$ 7,618	$ 49,326	$ (2,346)	$ 95,565

[1] Calculated as total net income (loss) less amounts attributable to non-controlling interests.

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Goodwill and Other Intangible Assets (Rollforward of Other Intangible Assets) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Other Intangible Assets [Line Items]
Other intangible assets, gross carrying amount						$ 354,200
Accumulated amortization						(103,800)
Other Intangible Assets [Rollforward]
Other intangible assets, net, beginning balance				$ 250,373
Amortization expense		$ (6,900)	$ (6,600)	(21,500)	$ (17,000)
Currency translation adjustments, other intangible assets				(10,100)
Other intangible assets, net, ending balance		218,761		218,761
Customer Relationships and Backlog [Member]
Other Intangible Assets [Line Items]
Other intangible assets, amortizing, gross carrying amount						199,800
Accumulated amortization						(90,300)
Other Intangible Assets [Rollforward]
Other intangible assets, net, amortizing, beginning balance				109,500
Amortization expense				(20,100)
Currency translation adjustments, amortizing intangible assets				(1,800)
Other intangible assets, net, amortizing, ending balance		87,600		87,600
Other Amortizing Intangible Assets [Member]
Other Intangible Assets [Line Items]
Other intangible assets, amortizing, gross carrying amount	[1]					26,300
Accumulated amortization	[1]					(13,500)
Other Intangible Assets [Rollforward]
Other intangible assets, net, amortizing, beginning balance	[1]			12,800
Amortization expense	[1]			(1,400)
Currency translation adjustments, amortizing intangible assets	[1]			(400)
Other intangible assets, net, amortizing, ending balance	[1]	11,000		11,000
Trade Names [Member]
Other Intangible Assets [Line Items]
Other intangible assets, non-amortizing, carrying amount		34,800		34,800		34,800
Other Intangible Assets [Rollforward]
Other intangible assets, non-amortizing, beginning balance				34,800
Currency translation adjustments, non-amortizing intangible assets				0
Other intangible assets, non-amortizing, ending balance		34,800		34,800
Pre-Qualifications [Member]
Other Intangible Assets [Line Items]
Other intangible assets, non-amortizing, carrying amount		85,400		93,300		$ 93,300
Other Intangible Assets [Rollforward]
Other intangible assets, non-amortizing, beginning balance				93,300
Currency translation adjustments, non-amortizing intangible assets				(7,900)
Other intangible assets, non-amortizing, ending balance		$ 85,400		$ 85,400

[1] Consists principally of trade names and non-compete agreements.

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Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Activity, Restricted Shares) (Details) - Restricted Shares [Member] - Common Stock [Member]	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Restricted Shares
Non-vested restricted shares, beginning balance (in shares) | shares	1,414,645
Granted (in shares) | shares	87,690
Vested (in shares) | shares	(199,235)
Canceled/forfeited (in shares) | shares	(17,774)
Non-vested restricted shares, ending balance (in shares) | shares	1,285,326
Per Share Weighted Average Grant Date Fair Value
Non-vested restricted shares, per share weighted average grant date fair value, beginning balance (in dollars per share)	$ 25.32
Granted (in dollars per share)	18.40
Vested (in dollars per share)	18.22
Canceled/forfeited (in dollars per share)	28.42
Non-vested restricted shares, per share weighted average grant date fair value, ending balance (in dollars per share)	$ 25.90

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Condensed Unaudited Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenue	$ 1,111,010	$ 1,315,488	$ 3,180,906	$ 3,380,538
Costs of revenue, excluding depreciation and amortization	972,711	1,122,861	2,805,072	2,914,901
Depreciation and amortization	42,196	41,747	128,048	111,996
General and administrative expenses	63,798	59,889	207,077	167,454
Interest expense, net	11,964	12,643	35,845	37,595
Other expense (income), net	6,702	(1,416)	4,342	(5,424)
Income from continuing operations before income taxes	13,639	79,764	522	154,016
Provision for income taxes	(6,197)	(30,319)	(3,288)	(58,569)
Net income (loss) from continuing operations	7,442	49,445	(2,766)	95,447
Discontinued operations:
Net loss from discontinued operations	0	(320)	0	(592)
Net income (loss)	7,442	49,125	(2,766)	94,855
Net (loss) income attributable to non-controlling interests	(176)	139	(420)	48
Net income (loss) attributable to MasTec, Inc.	$ 7,618	$ 48,986	$ (2,346)	$ 94,807
Basic earnings (loss) per share:
Continuing operations	$ 0.10	$ 0.60	$ (0.03)	$ 1.21
Discontinued operations	0.00	0.00	0.00	(0.01)
Total basic earnings (loss) per share	$ 0.10	$ 0.60	$ (0.03)	$ 1.20
Basic weighted average common shares outstanding	79,845	81,811	80,681	79,158
Diluted earnings (loss) per share:
Continuing operations	$ 0.09	$ 0.57	$ (0.03)	$ 1.11
Discontinued operations	0.00	0.00	0.00	(0.01)
Total diluted earnings (loss) per share	$ 0.09	$ 0.57	$ (0.03)	$ 1.10
Diluted weighted average common shares outstanding	80,448	85,824	80,681	86,416

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Acquisitions (Schedule of Finite-Lived Intangible Assets Acquired, Business Acquisitions - WesTower) (Details) - WesTower [Member] $ in Millions	Oct. 01, 2014 USD ($)
Business Combinations [Line Items]
Finite-lived intangible assets, fair value (in dollars)	$ 42.6
Finite-lived intangible assets, weighted average useful life (in years)	16 years
Backlog [Member]
Business Combinations [Line Items]
Finite-lived intangible assets, fair value (in dollars)	$ 4.7
Finite-lived intangible assets, weighted average useful life (in years)	5 years
Trade Name [Member]
Business Combinations [Line Items]
Finite-lived intangible assets, fair value (in dollars)	$ 1.1
Finite-lived intangible assets, weighted average useful life (in years)	4 years
Non-Compete Agreements [Member]
Business Combinations [Line Items]
Finite-lived intangible assets, fair value (in dollars)	$ 0.3
Finite-lived intangible assets, weighted average useful life (in years)	4 years
Customer Relationships [Member]
Business Combinations [Line Items]
Finite-lived intangible assets, fair value (in dollars)	$ 36.5
Finite-lived intangible assets, weighted average useful life (in years)	18 years

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Related Party Transactions (CCP) (Narrative) (Details) - Cross Country Pipeline [Member] - Immediate Family Member of Management or Principal Owner [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Cost Method Investment [Member]
Related Party Transaction [Line Items]
Cost method investment, original cost	$ 15.0		$ 15.0
Lease and Rental Agreements [Member] | Equipment [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 4.8	$ 1.9	$ 7.5	$ 4.6

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Condensed Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net (loss) income		$ (2,766)	$ 94,855
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization		128,048	111,996
Non-cash interest expense		2,036	6,052
Non-cash stock-based compensation expense		9,486	11,584
Excess tax benefit from stock-based compensation	[1]	(56)	(3,494)
(Benefit from) provision for deferred income taxes		(9,076)	4,294
Other non-cash items		1,783	1,136
Gains on sales of assets		(2,619)	(4,068)
Non-cash change in estimated fair value of acquisition-related contingent consideration		(7,980)	0
Changes in assets and liabilities, net of acquisitions:
Accounts receivable		252,333	(126,950)
Inventories		22,406	(27,553)
Other assets, current and long-term portion		(13,915)	5,202
Accounts payable and accrued expenses		(76,747)	15,419
Billings in excess of costs and earnings		(31,168)	2,896
Book overdrafts		(7,830)	(10,399)
Other liabilities, current and long-term portion		(3,333)	49
Net cash provided by operating activities		260,602	81,019
Cash flows used in investing activities:
Cash paid for acquisitions, net of cash acquired		(148)	(162,901)
Capital expenditures		(70,766)	(90,962)
Proceeds from sale of property and equipment		9,763	12,204
Payments for other investments, net		(109,299)	(1,046)
Net cash used in investing activities		(170,450)	(242,705)
Cash flows (used in) provided by financing activities:
Proceeds from credit facilities		1,329,610	1,319,623
Repayments of credit facilities		(1,240,122)	(955,151)
Repayments of senior convertible notes		0	(105,325)
Repayments of other borrowings		(10,568)	(15,827)
Payments of capital lease obligations		(40,687)	(38,358)
Repurchase of common stock		(100,000)	0
Proceeds from stock-based awards, net of tax withholdings		1,743	318
Excess tax benefit from stock-based compensation		56	3,494
Payments of acquisition-related contingent consideration		(44,757)	(60,341)
Payments of financing costs		(2,435)	(1,455)
Net cash (used in) provided by financing activities		(107,160)	146,978
Effect of currency translation on cash		103	(1,152)
Net decrease in cash and cash equivalents		(16,905)	(15,860)
Cash and cash equivalents - beginning of period		24,059	22,927
Cash and cash equivalents - end of period		7,154	7,067
Supplemental cash flow information:
Interest paid		41,014	35,106
Income taxes paid, net of refunds		5,841	46,423
Supplemental disclosure of non-cash information:
Equipment acquired under capital lease		18,030	55,488
2011 Convertible Notes [Member]
Supplemental disclosure of non-cash information:
Premium shares, conversion of convertible notes			114,785
Earn-Out Arrangements [Member]
Supplemental disclosure of non-cash information:
Acquisition-related contingent consideration, new business combinations			33,612
Equipment [Member]
Supplemental disclosure of non-cash information:
Equipment acquired under financing arrangements		$ 7,949	$ 6,851

[1] Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with exercised stock options and vested restricted shares, are classified as financing cash flows in the Company’s condensed unaudited consolidated statements of cash flows.

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Commitments and Contingencies (Other Guarantees) (Narrative) (Details)	9 Months Ended
	Sep. 30, 2015 USD ($)
Other Guarantees [Line Items]
General warranty, description	MasTec also generally warrants the work it performs for a one to two year period following substantial completion of a project.
General warranty, accrued reserve (in dollars)	$ 0
Warranty [Member] | Minimum [Member]
Other Guarantees [Line Items]
General warranty, period (in years)	1 year
Warranty [Member] | Maximum [Member]
Other Guarantees [Line Items]
General warranty, period (in years)	2 years
Subsidiaries [Member]
Other Guarantees [Line Items]
Other guarantees, description	In the ordinary course of its business, from time to time, MasTec guarantees the obligations of its subsidiaries, including obligations under certain contracts with customers, certain lease obligations and in some states, obligations in connection with obtaining contractors’ licenses.

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Property and Equipment, Net (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Property and Equipment [Line Items]
Capitalized internal-use software, gross	$ 100,400		$ 100,400		$ 92,700
Capitalized internal-use software, net	35,300		35,300		$ 33,600
Depreciation and amortization	42,196	$ 41,747	128,048	$ 111,996
Property and Equipment [Member]
Property and Equipment [Line Items]
Depreciation and amortization	$ 35,300	$ 35,200	$ 106,600	$ 95,000

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Supplemental Guarantor Financial Information (Narrative) (Details)	Sep. 30, 2015
Senior Notes [Member] | 4.875% Senior Notes [Member]
Condensed Unaudited Consolidating Financial Information [Line Items]
Debt instrument, interest rate (percentage)	4.875%

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Supplemental Guarantor Financial Information (Tables)

9 Months Ended

Sep. 30, 2015

Condensed Unaudited Financial Statements, Supplemental Guarantor Information [Abstract]

Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (in millions)

For the Three Months Ended September 30, 2015	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	963.7		$	149.9		$	(2.6	)	$	1,111.0
Costs of revenue, excluding depreciation and amortization	—			841.9			133.4			(2.6		)	972.7
Depreciation and amortization	—			33.2			9.0			—			42.2
General and administrative expenses	0.7			57.0			6.1			—			63.8
Interest expense (income), net	—			27.7			(15.7		)	—			12.0
Other expense, net	—			6.0			0.7			—			6.7
(Loss) income from continuing operations before income taxes	$	(0.7	)	$	(2.1	)	$	16.4		$	—		$	13.6
Benefit from (provision for) income taxes	0.3			1.3			(7.8		)	—			(6.2		)
Net (loss) income from continuing operations	$	(0.4	)	$	(0.8	)	$	8.6		$	—		$	7.4
Equity in income from subsidiaries, net of tax	8.0			—			—			(8.0		)	—
Net income (loss)	$	7.6		$	(0.8	)	$	8.6		$	(8.0	)	$	7.4
Net loss attributable to non-controlling interests	—			—			(0.2		)	—			(0.2		)
Net income (loss) attributable to MasTec, Inc.	$	7.6		$	(0.8	)	$	8.8		$	(8.0	)	$	7.6
Comprehensive (loss) income	$	(5.7	)	$	(0.8	)	$	(4.8	)	$	5.4		$	(5.9	)

For the Three Months Ended September 30, 2014 (As Restated)	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	1,050.5		$	267.0		$	(2.0	)	$	1,315.5
Costs of revenue, excluding depreciation and amortization	—			893.0			231.9			(2.0		)	1,122.9
Depreciation and amortization	—			30.8			10.9			—			41.7
General and administrative expenses	0.6			50.8			8.5			—			59.9
Interest expense, net	—			11.5			1.1			—			12.6
Other (income) expense, net	—			(1.7		)	0.3			—			(1.4		)
(Loss) income from continuing operations before income taxes	$	(0.6	)	$	66.1		$	14.3		$	—		$	79.8
Benefit from (provision for) income taxes	0.2			(24.2		)	(6.4		)	—			(30.3		)
Net (loss) income from continuing operations	$	(0.4	)	$	41.9		$	7.9		$	—		$	49.4
Net loss from discontinued operations	—			—			(0.3		)	—			(0.3		)
Equity in income from subsidiaries, net of tax	49.3			—			—			(49.3		)	—
Net income (loss)	$	48.9		$	41.9		$	7.6		$	(49.3	)	$	49.1
Net income attributable to non-controlling interests	—			—			0.1			—			0.1
Net income (loss) attributable to MasTec, Inc.	$	48.9		$	41.9		$	7.5		$	(49.3	)	$	49.0
Comprehensive income (loss)	$	36.0		$	41.9		$	(5.3	)	$	(36.4	)	$	36.2

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (in millions)

For the Nine Months Ended September 30, 2015	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	2,657.9		$	530.2		$	(7.2	)	$	3,180.9
Costs of revenue, excluding depreciation and amortization	—			2,309.4			502.9			(7.2		)	2,805.1
Depreciation and amortization	—			98.1			29.9			—			128.0
General and administrative expenses	1.9			184.9			20.3			—			207.1
Interest expense (income), net	—			82.9			(47.1		)	—			35.8
Other expense, net	—			0.4			4.0			—			4.4
(Loss) income from continuing operations before income taxes	$	(1.9	)	$	(17.8	)	$	20.2		$	—		$	0.5
Benefit from (provision for) income taxes	0.8			7.9			(12.0		)	—			(3.3		)
Net loss (income) from continuing operations	$	(1.1	)	$	(9.9	)	$	8.2		$	—		$	(2.8	)
Equity in loss from subsidiaries, net of tax	(1.3		)	—			—			1.3			—
Net (loss) income	$	(2.4	)	$	(9.9	)	$	8.2		$	1.3		$	(2.8	)
Net loss attributable to non-controlling interests	—			—			(0.5		)	—			(0.5		)
Net (loss) income attributable to MasTec, Inc.	$	(2.4	)	$	(9.9	)	$	8.7		$	1.3		$	(2.3	)
Comprehensive (loss) income	$	(34.4	)	$	(9.9	)	$	(23.7	)	$	33.3		$	(34.8	)

For the Nine Months Ended September 30, 2014 (As Restated)	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	2,802.3		$	580.3		$	(2.1	)	$	3,380.5
Costs of revenue, excluding depreciation and amortization	—			2,402.6			514.4			(2.1		)	2,914.9
Depreciation and amortization	—			88.4			23.6			—			112.0
General and administrative expenses	1.8			146.7			19.0			—			167.5
Interest expense, net	—			35.6			2.0			—			37.6
Other (income) expense, net	—			(5.9		)	0.4			—			(5.5		)
(Loss) income from continuing operations before income taxes	$	(1.8	)	$	134.9		$	20.9		$	—		$	154.0
Benefit from (provision for) income taxes	0.7			(52.0		)	(7.3		)	—			(58.6		)
Net (loss) income from continuing operations	$	(1.1	)	$	82.9		$	13.6		$	—		$	95.4
Net loss from discontinued operations	—			—			(0.5		)	—			(0.5		)
Equity in income from subsidiaries, net of tax	95.9			—			—			(95.9		)	—
Net income (loss)	$	94.8		$	82.9		$	13.1		$	(95.9	)	$	94.9
Net loss attributable to non-controlling interests	—			—			(0.1)			—			(0.1)
Net income (loss) attributable to MasTec, Inc.	$	94.8		$	82.9		$	13.2		$	(95.9	)	$	94.8
Comprehensive income (loss)	$	84.2		$	83.0		$	2.4		$	(85.3	)	$	84.2

Condensed Unaudited Consolidating Balance Sheets

CONDENSED UNAUDITED CONSOLIDATING BALANCE SHEETS (in millions)

As of September 30, 2015	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Current assets	$	—	$	1,007.7	$	230.6	$	—		$	1,238.3
Property and equipment, net	—		464.9		122.1		—			587.0
Goodwill and other intangible assets, net	—		1,055.6		228.0		—			1,283.6
Investments in and advances to consolidated affiliates, net	2,036.4		95.7		1,083.8		(3,215.9		)	—
Other long-term assets	9.3		38.7		88.9		—			136.9
Total assets	$	2,045.7	$	2,662.6	$	1,753.4	$	(3,215.9	)	$	3,245.8
Liabilities and equity
Total current liabilities	$	—	$	666.6	$	120.8	$	—		$	787.4
Long-term debt	—		1,068.1		30.5		—			1,098.6
Other long-term liabilities	—		227.4		107.9		—			335.3
Total liabilities	$	—	$	1,962.1	$	259.2	$	—		$	2,221.3
Total equity	$	2,045.7	$	700.5	$	1,494.2	$	(3,215.9	)	$	1,024.5
Total liabilities and equity	$	2,045.7	$	2,662.6	$	1,753.4	$	(3,215.9	)	$	3,245.8

As of December 31, 2014	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Current assets	$	—	$	1,249.6	$	282.2	$	—		$	1,531.8
Property and equipment, net	—		472.6		150.5		—			623.1
Goodwill and other intangible assets, net	—		1,068.3		264.5		—			1,332.8
Investments in and advances to consolidated affiliates, net	2,108.4		—		1,097.0		(3,205.4		)	—
Other long-term assets	9.3		28.7		38.3		—			76.3
Total assets	$	2,117.7	$	2,819.2	$	1,832.5	$	(3,205.4	)	$	3,564.0
Liabilities and equity
Total current liabilities	$	—	$	777.4	$	203.4	$	—		$	980.8
Long-term debt	—		1,027.3		33.9		—			1,061.2
Advances from consolidated affiliates, net	—		70.7		—		(70.7		)	—
Other long-term liabilities	—		239.3		134.6		—			373.9
Total liabilities	$	—	$	2,114.7	$	371.9	$	(70.7	)	$	2,415.9
Total equity	$	2,117.7	$	704.5	$	1,460.6	$	(3,134.7	)	$	1,148.1
Total liabilities and equity	$	2,117.7	$	2,819.2	$	1,832.5	$	(3,205.4	)	$	3,564.0

Condensed Unaudited Consolidating Statements of Cash Flows

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF CASH FLOWS (in millions)

For the Nine Months Ended September 30, 2015	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash (used in) provided by operating activities	$	(1.1	)	$	317.0		$	(55.3	)	$	—	$	260.6
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	—			(0.1		)	—			—		(0.1		)
Capital expenditures	—			(58.2		)	(12.6		)	—		(70.8		)
Proceeds from sale of property and equipment	—			8.4			1.4			—		9.8
Payments for investments, net	—			(109.3		)	—			—		(109.3		)
Net cash used in investing activities	$	—		$	(159.2	)	$	(11.2	)	$	—	$	(170.5	)
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	—			827.1			502.5			—		1,329.6
Repayments of credit facilities	—			(747.8		)	(492.3		)	—		(1,240.1		)
Repayments of other borrowings and capital lease obligations	—			(36.4		)	(14.9		)	—		(51.3		)
Repurchase of common stock	(100.0		)	—			—			—		(100.0		)
Proceeds from stock-based awards, net of tax withholdings	2.1			(0.4		)	—			—		1.7
Excess tax benefits from stock-based compensation	—			0.1			—			—		0.1
Payments of acquisition-related contingent consideration	—			(37.3		)	(7.5		)	—		(44.8		)
Payments of financing costs	—			(2.4		)	—			—		(2.4		)
Net financing activities and advances from (to) consolidated affiliates	99.0			(169.2		)	70.2			—		—
Net cash provided by (used in) financing activities	$	1.1		$	(166.3	)	$	58.0		$	—	$	(107.2	)
Effect of currency translation on cash	—			—			0.1			—		0.1
Net decrease in cash and cash equivalents	$	—		$	(8.5	)	$	(8.4	)	$	—	$	(16.9	)
Cash and cash equivalents - beginning of period	—			18.5			5.6			—		24.1
Cash and cash equivalents - end of period	$	—		$	10.0		$	(2.8	)	$	—	$	7.2

For the Nine Months Ended September 30, 2014 (As Restated)	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash (used in) provided by operating activities	$	(0.9	)	$	41.1		$	40.8		$	—	$	81.0
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	—			(40.0		)	(122.9		)	—		(162.9		)
Capital expenditures	—			(75.6		)	(15.4		)	—		(91.0		)
Proceeds from sale of property and equipment	—			10.3			1.9			—		12.2
Payments for investments, net	$	—		$	(1.0	)	$	—		$	—	$	(1.0	)
Net cash used in investing activities	$	—		$	(106.3	)	$	(136.4	)	$	—	$	(242.7	)
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	$	—		$	1,122.4		$	197.2		$	—	$	1,319.6
Repayments of credit facilities	—			(723.2		)	(232.0		)	—		(955.2		)
Repayment of senior convertible notes	—			(105.3		)	—			—		(105.3		)
Repayments of other borrowings and capital lease obligations	—			(45.4		)	(8.7		)	—		(54.1		)
Proceeds from stock-based awards, net of tax withholdings	2.9			(2.6		)	—			—		0.3
Excess tax benefits from stock-based compensation	—			3.5			—			—		3.5
Payments of acquisition-related contingent consideration	—			(60.3		)	—			—		(60.3		)
Payments of financing costs	—			(1.5		)	—			—		(1.5		)
Net financing activities and advances (to) from consolidated affiliates	(2.0		)	(125.2		)	127.2			—		—
Net cash provided by financing activities	$	0.9		$	62.4		$	83.7		$	—	$	147.0
Effect of currency translation on cash	—			—			(1.2		)	—		(1.2		)
Net decrease in cash and cash equivalents	$	—		$	(2.8	)	$	(13.1	)	$	—	$	(15.9	)
Cash and cash equivalents - beginning of period	—			5.4			17.6			—		22.9
Cash and cash equivalents - end of period	$	—		$	2.6		$	4.5		$	—	$	7.1

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Debt (Debt Guarantees and Covenants) (Narrative) (Details) - Senior Notes [Member] - 4.875% Senior Notes [Member]	9 Months Ended
	Sep. 30, 2015
Debt Instrument [Line Items]
Debt instrument, guarantees	The 4.875% Senior Notes are senior unsecured unsubordinated obligations and rank equal in right of payment with existing and future unsubordinated debt, and rank senior in right of payment to existing and future subordinated debt and are fully and unconditionally guaranteed on an unsecured, unsubordinated, joint and several basis by certain of the Company’s existing and future 100%-owned direct and indirect domestic subsidiaries that are each guarantors of the Credit Facility or other outstanding indebtedness.
Debt instrument, interest rate (percentage)	4.875%

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Related Party Transactions

9 Months Ended

Sep. 30, 2015

Related Party Transactions [Abstract]

Related Party Transactions

Note 16 - Related Party Transactions

MasTec purchases, rents and leases equipment used in its business from a number of different vendors on a non-exclusive basis, including Cross Country Pipeline Supply, Inc. (“CCP”), in which the Company has a cost method investment of $15 million, resulting from its investment in CCP in 2013. Juan Carlos Mas, who is the brother of Jorge Mas, Chairman of MasTec’s Board of Directors, and José R. Mas, MasTec’s Chief Executive Officer, serves as the chairman of CCP. Additionally, an entity owned by Jorge, José and Juan Carlos Mas is a minority shareholder of CCP. For the three month periods ended September 30, 2015 and 2014, MasTec paid CCP approximately $4.8 million and $1.9 million, respectively, for equipment rentals, leases and servicing. For the nine month periods ended September 30, 2015 and 2014, MasTec paid CCP approximately $7.5 million and $4.6 million, respectively, for equipment rentals, leases and servicing.

MasTec leases employees to a customer in which Jorge Mas and José R. Mas own a minority interest. For both the three month periods ended September 30, 2015 and 2014, MasTec charged approximately $0.2 million to this customer. For the nine month periods ended September 30, 2015 and 2014, MasTec charged approximately $0.6 million and $0.5 million to this customer. As of both September 30, 2015 and December 31, 2014, outstanding receivables from employee leasing arrangements with this customer totaled $0.1 million. The Company also provides satellite communication services to this customer. For the three month periods ended September 30, 2015 and 2014, satellite communication revenue relating to this customer totaled approximately $0.2 million and $0.3 million, respectively. For the nine month periods ended September 30, 2015 and 2014, satellite communication revenues relating to this customer were approximately $0.7 million and $0.8 million, respectively. As of September 30, 2015 and December 31, 2014, outstanding receivables from this customer for satellite communication services totaled approximately $0.3 million and $0.5 million, respectively.

Split Dollar Agreements

MasTec has a split dollar agreement with José R. Mas, which became effective in August 2014 and replaced a prior split dollar and deferred bonus agreement. For the three month period ended September 30, 2015, the Company made no payments in connection with this agreement. For the nine month period ended September 30, 2015, the Company paid $0.7 million in connection with the split dollar agreement. For the three month period ended September 30, 2014, the Company paid approximately $0.7 million in connection with the split dollar agreement for José R. Mas, and for the nine month period ended September 30, 2014 the Company received approximately $0.1 million in proceeds from policies surrendered, net of premiums paid, in connection with the prior split dollar and deferred bonus agreements for José R. Mas. MasTec also has a split dollar agreement with Jorge Mas. The Company paid approximately $0.6 million and $1.1 million in connection with this agreement for the three and nine month periods ended September 30, 2015, respectively, and paid approximately $0.6 million and $1.1 million in connection with this agreement for the three and nine month periods ended September 30, 2014, respectively. As of September 30, 2015 and December 31, 2014, life insurance assets associated with these agreements totaled $13.0 million and $11.1 million respectively, and were included within other long-term assets in the consolidated balance sheets. For additional information regarding the split dollar agreements with José and Jorge Mas, see Note 18 - Related Party Transactions in the notes to the 2014 Form 10-K.

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Business, Basis of Presentation and Significant Accounting Policies (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014	Sep. 30, 2015 USD ($) segment	Sep. 30, 2014	Dec. 31, 2014 USD ($)
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Number of reportable segments | segment			5
Revenue Recognition [Line Items]
Unapproved change orders, description			The Company may incur costs subject to change orders, whether approved or unapproved by the customer, and/or claims related to certain contracts. Management determines the probability that such costs will be recovered based upon engineering studies and legal opinions, past practices with the customer, specific discussions, correspondence or preliminary negotiations with the customer. The Company treats project costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, or defers costs and/or recognizes revenue up to the amount of the related cost if it is probable that the contract price will be adjusted and can be reliably estimated.
Unapproved change orders, expected to be billed and collected within one year, amount (in dollars)	$ 28.0		$ 28.0		$ 87.0
Maximum [Member]
Revenue Recognition [Line Items]
Fixed price contract, term within which generally completed (in years)			1 year
Change order approval process, term within which expected to be completed (in years)			1 year
Contracts Accounted for under Percentage-of-Completion [Member] | Maximum [Member]
Revenue Recognition [Line Items]
Change in accounting estimate, percentage-of-completion projects, financial effect on project profit, percentage			5.00%	5.00%
Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member] | Power Generation and Industrial [Member]
Revenue Recognition [Line Items]
Project losses (in dollars)	3.8		$ 21.4
Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member] | Pacer [Member] | Joint Venture [Member] | Other [Member]
Revenue Recognition [Line Items]
Project losses (in dollars)	$ 2.8		$ 8.3
Revenue [Member] | Master Service and Other Service Agreements [Member] | Concentration Risk from Type of Arrangement [Member]
Revenue Recognition [Line Items]
Concentration risk, percentage of total	44.00%	43.00%	47.00%	49.00%

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Related Party Transactions (Split Dollar Agreements) (Narrative) (Details) - Split Dollar Life Insurance [Member] - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Payments for life insurance policies	$ 0	$ 700,000	$ 700,000
Proceeds from life insurance policies, net of premiums paid				$ 100,000
Chairman, Board of Directors [Member]
Related Party Transaction [Line Items]
Payments for life insurance policies	600,000	$ 600,000	1,100,000	$ 1,100,000
Executive Officers [Member] | Other Long-Term Assets [Member]
Related Party Transaction [Line Items]
Life insurance assets, carrying amount	$ 13,000,000		$ 13,000,000		$ 11,100,000

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Business, Basis of Presentation and Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2015

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying condensed unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions for Form 10-Q and Rule 10-01 of Regulation S-X. Pursuant to these rules and regulations, certain information and footnote disclosures normally included in the annual audited consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The accompanying condensed consolidated balance sheet as of December 31, 2014 is derived from the Company’s audited financial statements as of that date. Because certain information and footnote disclosures have been condensed or omitted, these condensed unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto as of and for the year ended December 31, 2014 contained in the 2014 Form 10-K. In management’s opinion, all normal and recurring adjustments considered necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented have been included. Certain prior year amounts have been reclassified to conform to the current period presentation. Interim period operating results do not necessarily indicate the results that may be expected for any other interim period or for the full fiscal year. The Company believes that the disclosures made in these condensed unaudited consolidated financial statements are adequate to make the information not misleading.

Reclassifications

Certain prior year amounts have been reclassified to conform to the current period presentation.

Principles of Consolidation

Principles of Consolidation

The accompanying condensed unaudited consolidated financial statements include MasTec, Inc. and its subsidiaries and include the accounts of all majority owned subsidiaries over which the Company exercises control and, when applicable, entities in which the Company has a controlling financial interest. Other parties’ interests in companies for which MasTec exercises control and has a controlling financial interest are reported as non-controlling interests within equity. Net income or loss attributable to non-controlling interests is reported as a separate line item below net income or loss. The Company’s investments in entities in which the Company does not have a controlling interest, but for which it has the ability to exert significant influence, are accounted for using the equity method of accounting. Equity method investments are recorded as other long-term assets in the condensed unaudited consolidated balance sheets. Income or loss from these investments is recorded within other income or expense in the condensed unaudited consolidated statements of operations. The cost method is used for investments in entities in which the Company does not have the ability to exert significant influence. All significant intercompany balances and transactions have been eliminated in consolidation. The assets and liabilities of foreign subsidiaries with a functional currency other than the U.S. dollar are translated into U.S. dollars at period-end exchange rates, with resulting translation gains or losses accumulated within other comprehensive income or loss. Revenue and expenses are translated into U.S. dollars at average rates of exchange during the applicable period. Substantially all of the Company’s foreign operations use the local currency as the functional currency. Gains or losses resulting from transactions executed in a foreign currency are included in other income or expense, net. The Company does not currently have subsidiaries that operate in highly inflationary environments. The results of operations and financial position of any discontinued operations are aggregated and presented separately from the Company’s continuing operations in the condensed unaudited consolidated financial statements for all periods presented.

Translation of Foreign Currencies

The assets and liabilities of foreign subsidiaries with a functional currency other than the U.S. dollar are translated into U.S. dollars at period-end exchange rates, with resulting translation gains or losses accumulated within other comprehensive income or loss. Revenue and expenses are translated into U.S. dollars at average rates of exchange during the applicable period. Substantially all of the Company’s foreign operations use the local currency as the functional currency. Gains or losses resulting from transactions executed in a foreign currency are included in other income or expense, net. The Company does not currently have subsidiaries that operate in highly inflationary environments.

Investments in Affiliates and Other Entities

Investments in Affiliates and Other Entities

In the ordinary course of business, the Company enters into various investment arrangements, which may include equity or other interests in business entities, including contractual joint ventures or other forms of equity participation. These investment arrangements may include financing arrangements, such as the extension of loans. See Note 3 - Acquisitions and Note 5 - Fair Value of Financial Instruments for discussion pertaining to certain of the Company’s cost and equity method investments and other investment arrangements. In connection with certain of these investment arrangements, the Company provides infrastructure construction services to or through its equity investees and/or contractual joint ventures. Management determines whether such investment arrangements involve a variable interest entity (“VIE”) based on the characteristics of the particular entity. If an entity is determined to be a VIE, then management determines if the Company is the primary beneficiary of the entity and whether or not consolidation of the VIE within the Company's financial statements is required. The primary beneficiary consolidating the VIE must normally have both (i) the power to direct the primary activities of the VIE and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE, which, in either case, could be significant to the VIE. If management determines that the Company is the primary beneficiary of a VIE, then the VIE would be consolidated, and the other party’s equity interest in the VIE would be accounted for as a non-controlling interest. As of September 30, 2015, the Company determined that certain of its investment arrangements were VIEs, but that it was not the primary beneficiary. In arrangements in which the Company has an undivided interest in the assets, liabilities, revenues and profits or losses of an unincorporated entity, such amounts are consolidated on a basis proportional to the Company’s ownership interest in the unincorporated entity.

Variable Interest Entities

In the ordinary course of business, the Company enters into various investment arrangements, which may include equity or other interests in business entities, including contractual joint ventures or other forms of equity participation. These investment arrangements may include financing arrangements, such as the extension of loans. See Note 3 - Acquisitions and Note 5 - Fair Value of Financial Instruments for discussion pertaining to certain of the Company’s cost and equity method investments and other investment arrangements. In connection with certain of these investment arrangements, the Company provides infrastructure construction services to or through its equity investees and/or contractual joint ventures. Management determines whether such investment arrangements involve a variable interest entity (“VIE”) based on the characteristics of the particular entity. If an entity is determined to be a VIE, then management determines if the Company is the primary beneficiary of the entity and whether or not consolidation of the VIE within the Company's financial statements is required. The primary beneficiary consolidating the VIE must normally have both (i) the power to direct the primary activities of the VIE and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE, which, in either case, could be significant to the VIE. If management determines that the Company is the primary beneficiary of a VIE, then the VIE would be consolidated, and the other party’s equity interest in the VIE would be accounted for as a non-controlling interest.

Unincorporated Joint Ventures, Proportionate Consolidation

In arrangements in which the Company has an undivided interest in the assets, liabilities, revenues and profits or losses of an unincorporated entity, such amounts are consolidated on a basis proportional to the Company’s ownership interest in the unincorporated entity.

Management Estimates

Management Estimates

The preparation of financial statements in conformity with U.S. GAAP requires the use of estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Key estimates include: the recognition of revenue and project profit or loss (which the Company defines as project revenue, less project costs of revenue, including depreciation), in particular, on long-term construction contracts, or other projects accounted for under the percentage-of-completion method, for which the recorded amounts require estimates of costs to complete projects, ultimate project profit and the amount of contract price adjustments that are probable; allowances for doubtful accounts; estimated fair values of goodwill and intangible assets and liabilities, acquisition-related contingent consideration and investments in cost and equity method investees; asset lives used in computing depreciation and amortization; accrued self-insured claims; share-based compensation; accounting for income taxes; and the estimated impact of contingencies and ongoing litigation. While management believes that such estimates are fair when considered in conjunction with its consolidated financial position and results of operations taken as a whole, actual results could differ from those estimates and such differences could be material to the condensed unaudited consolidated financial statements.

Revenue Recognition

Revenue Recognition

Revenue is derived from projects performed under master and other service agreements as well as from fixed price contracts for specific projects or jobs requiring the construction and installation of an entire infrastructure system or specified units within an entire infrastructure system. The Company frequently provides maintenance, installation and repair work under unit price or fixed price master service or other service agreements that are renewed on a periodic basis. Revenue and related costs for master and other service agreements billed on a time and materials basis are recognized as the services are rendered. Revenue derived from projects performed under master service and other service agreements totaled 44% and 43% of revenue for the three month periods ended September 30, 2015 and 2014, respectively, and totaled 47% and 49% of revenue, respectively, for the nine month periods ended September 30, 2015 and 2014. The Company also performs services under master and other service agreements on a fixed fee basis, under which MasTec furnishes specified units of service for a fixed price per unit of service and revenue is recognized as the services are rendered. Revenue from fixed price contracts provides for a fixed amount of revenue for the entire project, subject to certain additions for changed scope or specifications. Revenue from these contracts, as well as for certain projects pursuant to master and other service agreements, is recognized using the percentage-of-completion method, under which the percentage of revenue to be recognized for a given project is measured by the percentage of costs incurred to date on the contract to the total estimated costs for the contract. Such contracts provide that the customer accept completion of progress to date and compensate the Company for services rendered, which may be measured in terms of costs incurred, units installed, hours expended or some other measure of progress. Contract costs include all direct materials, labor and subcontracted costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and the operational costs of capital equipment (excluding depreciation). Much of the materials associated with the Company’s work are customer-furnished and are therefore not included in contract revenue and costs.

The estimation process for revenue recognized under the percentage-of-completion method is based on the professional knowledge and experience of the Company’s engineers, project managers and financial professionals. Management reviews estimates of contract revenue and costs on an ongoing basis. Changes in job performance, job conditions and final contract settlements are factors that influence management’s assessment of total contract value and total estimated costs to complete those contracts and, therefore, the Company’s profit recognition. Changes in these factors may result in revisions to costs and income, and their effects are recognized in the period in which the revisions are determined, which could materially affect the Company’s results of operations in the period in which such changes are recognized. Excluding the effects of project losses of $21.4 million on a Canadian wind project and $8.3 million on a non-controlled proportionately consolidated Canadian joint venture for the nine month period ended September 30, 2015, project profit was affected by less than 5% for both the nine month periods ended September 30, 2015 and 2014 as a result of changes in contract estimates included in projects that were in process as of December 31, 2014 and 2013, respectively. Provisions for losses on uncompleted contracts are made in the period in which such losses are determined to be probable and the amount can be reasonably estimated. The majority of fixed price contracts are generally completed within one year.

The Company may incur costs subject to change orders, whether approved or unapproved by the customer, and/or claims related to certain contracts. Management determines the probability that such costs will be recovered based upon engineering studies and legal opinions, past practices with the customer, specific discussions, correspondence or preliminary negotiations with the customer. The Company treats project costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, or defers costs and/or recognizes revenue up to the amount of the related cost if it is probable that the contract price will be adjusted and can be reliably estimated. As of September 30, 2015 and December 31, 2014, the Company had approximately $28 million and $87 million, respectively, of change orders and/or claims that had been included as contract price adjustments on certain contracts that were in the process of being resolved in the normal course of business, including through negotiation, arbitration and other proceedings. These contract price adjustments, which are included within costs and earnings in excess of billings, or billed accounts receivable as appropriate, represent management’s best estimate of contract revenue that has been or will be earned and that management believes is probable of collection. As of both September 30, 2015 and December 31, 2014, outstanding change orders and/or claims were derived from contracts in the Electrical Transmission and Oil and Gas segments. The Company actively engages in substantive meetings with these customers to complete the final approval process and expects these processes to be completed within one year. The amounts ultimately realized upon final acceptance by its customers could be higher or lower than such estimated amounts.

Billings in excess of costs and estimated earnings on uncompleted contracts are classified as current liabilities. Costs and estimated earnings in excess of billings, or work in process, is classified within current assets for the majority of the Company’s projects. Work in process on contracts is based on work performed but not yet billed to customers as per individual contract terms.

Revenue Recognition, Percentage-of-Completion Method

Revenue from fixed price contracts provides for a fixed amount of revenue for the entire project, subject to certain additions for changed scope or specifications. Revenue from these contracts, as well as for certain projects pursuant to master and other service agreements, is recognized using the percentage-of-completion method, under which the percentage of revenue to be recognized for a given project is measured by the percentage of costs incurred to date on the contract to the total estimated costs for the contract. Such contracts provide that the customer accept completion of progress to date and compensate the Company for services rendered, which may be measured in terms of costs incurred, units installed, hours expended or some other measure of progress. Contract costs include all direct materials, labor and subcontracted costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and the operational costs of capital equipment (excluding depreciation). Much of the materials associated with the Company’s work are customer-furnished and are therefore not included in contract revenue and costs.

The estimation process for revenue recognized under the percentage-of-completion method is based on the professional knowledge and experience of the Company’s engineers, project managers and financial professionals. Management reviews estimates of contract revenue and costs on an ongoing basis. Changes in job performance, job conditions and final contract settlements are factors that influence management’s assessment of total contract value and total estimated costs to complete those contracts and, therefore, the Company’s profit recognition. Changes in these factors may result in revisions to costs and income, and their effects are recognized in the period in which the revisions are determined, which could materially affect the Company’s results of operations in the period in which such changes are recognized. Excluding the effects of project losses of $21.4 million on a Canadian wind project and $8.3 million on a non-controlled proportionately consolidated Canadian joint venture for the nine month period ended September 30, 2015, project profit was affected by less than 5% for both the nine month periods ended September 30, 2015 and 2014 as a result of changes in contract estimates included in projects that were in process as of December 31, 2014 and 2013, respectively. Provisions for losses on uncompleted contracts are made in the period in which such losses are determined to be probable and the amount can be reasonably estimated. The majority of fixed price contracts are generally completed within one year.

New Accounting Pronouncements

New Accounting Pronouncements

Accounting Standards Not Yet Adopted

In September 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments (“ASU 2015-16”). ASU 2015-16 eliminates the requirement to retrospectively account for adjustments to provisional amounts within the measurement period recognized at the acquisition date in a business combination. ASU 2015-16 requires that these adjustments be recognized in the reporting period in which the adjustment amounts are determined and be calculated as if the accounting had been completed as of the acquisition date. ASU 2015-16 is effective prospectively for fiscal years, and for interim periods within those years, beginning after December 15, 2015. Early application is permitted. The Company is currently evaluating the impact of this ASU on its consolidated financial statements.

In July 2015, the FASB issued ASU 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory (“ASU 2015-11”). ASU 2015-11 requires that inventory measured using any method other than last-in, first out (“LIFO”) or the retail inventory method to be subsequently measured at the lower of cost or net realizable value, rather than at the lower of cost or market value. Under this ASU, subsequent measurement of inventory using the LIFO and retail inventory method is unchanged. ASU 2015-11 is effective prospectively for fiscal years, and for interim periods within those years, beginning after December 15, 2016. Early application is permitted. The Company is currently evaluating the impact of this ASU on its consolidated financial statements.

In April 2015, the FASB issued ASU 2015-05, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. ASU 2015-05 provides guidance for determining whether a cloud computing arrangement includes a software license and requires that all software licenses within the scope of Subtopic 350-40 be accounted for in a manner consistent with other licenses of intangible assets. ASU 2015-05 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early application is permitted. Retrospective application is permitted for all relevant prior periods. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements.

In April 2015, the FASB issued ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03”). ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented as a direct deduction from the carrying amount of the debt, consistent with debt discounts. ASU 2015-03 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early application is permitted. Retrospective application is required for all relevant prior periods. In August 2015, the FASB issued ASU 2015-15, Interest - Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements - Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting (SEC Update) (“ASU 2015-15”). ASU 2015-15 clarifies that, subsequent to adoption of ASU 2015-03, an entity has the option to defer and present debt issuance costs from line-of-credit arrangements as an asset and subsequently amortize the costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. The Company does not expect the adoption of ASU 2015-03 or ASU 2015-15 to have a material impact on its consolidated financial statements.

In February 2015, the FASB issued ASU 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis (“ASU 2015-02”). ASU 2015-02 changes the evaluation that a reporting entity must perform to determine whether it should consolidate certain types of legal entities, reduces the number of consolidation models and places emphasis on risk of loss when determining a controlling financial interest. Under ASU 2015-02, all entities are within the scope of Accounting Standards Codification (“ASC”) Subtopic 810, Consolidation, including limited partnerships and similar legal entities, unless a scope exception applies. The presumption that a general partner controls a limited partnership has been eliminated. In addition, fees paid to decision makers that meet certain conditions no longer cause consolidation of VIEs in certain instances. The amendments place more emphasis on variable interests other than fee arrangements and reduce the extent to which related party arrangements cause an entity to be considered a primary beneficiary. ASU 2015-02 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early application is permitted. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements.

In January 2015, the FASB issued ASU 2015-01, Income Statement - Extraordinary and Unusual Items (Subtopic 225-20): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items (“ASU 2015-01”). ASU 2015-01 eliminates the presentation and disclosure requirements of extraordinary items because it was unclear when an item should be considered both unusual and infrequent and was extremely rare in practice. ASU 2015-01 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. The Company does not expect the adoption of this ASU to have an impact on its consolidated financial statements.

In November 2014, the FASB issued ASU 2014-16, Derivatives and Hedging (Topic 815): Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share is More Akin to Debt or to Equity (a consensus of the FASB Emerging Issues Task Force) (“ASU 2014-16”). The amendments in ASU 2014-16 do not change the current criteria in U.S. GAAP for determining when separation of certain embedded derivative features in a hybrid financial instrument is required. Rather, ASU 2014-16 clarifies how current U.S. GAAP should be interpreted in evaluating the economic characteristics and risks of a host contract in a hybrid financial instrument that is issued in the form of a share. ASU 2014-16 is effective for existing hybrid financial instruments issued in the form of a share on a modified retrospective basis for fiscal years, and for interim periods within those years, beginning after December 15, 2015. Retrospective application is permitted for all relevant prior periods. The Company does not expect the adoption of this ASU to have an impact on its consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”). The core principle of this ASU is that a company will recognize revenue when it transfers goods or services to customers in an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under current guidance and will be required to disclose information about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including disclosure of assumptions and estimates where significant judgment has been applied. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which delayed the effective date of ASU 2014-09 by one year. ASU 2014-09, as amended, is effective using either the retrospective or cumulative effect transition method for fiscal years, and for interim periods within those years, beginning after December 15, 2017. Early application is permitted, but not before fiscal years, and interim periods within those years, beginning after December 15, 2016. The Company is currently determining which transition method will be used and evaluating the potential impact of this ASU on its consolidated financial statements.

Recently Adopted Accounting Pronouncements

In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity (“ASU 2014-08”). ASU 2014-08 changes the requirements for reporting discontinued operations and requires additional disclosures about discontinued operations. Only disposals of components of an entity representing a strategic shift that has, or will have, a major effect on an entity’s operations and financial results should be reported as discontinued operations under ASU 2014-08. Examples include a disposal of a major geographical area, a major line of business, or a major equity method investment. ASU 2014-08 also requires expanded disclosure about discontinued operations and requires disclosure about individually significant dispositions that do not qualify as a discontinued operation. ASU 2014-08 is effective prospectively for fiscal years, and for interim periods within those years, beginning after December 15, 2014. The Company adopted ASU 2014-08 as of January 1, 2015. The adoption of this ASU did not have an impact on the Company’s condensed unaudited consolidated financial statements, but could impact whether future disposals of operations would qualify as discontinued operations.

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Lease Obligations (Capital Leases) (Narrative) (Details) - Property and Equipment [Member] - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Capital Leases [Line Items]
Assets held under capital lease, gross	$ 301.5	$ 281.6
Assets held under capital lease, net	$ 212.5	$ 217.8

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Business, Basis of Presentation and Significant Accounting Policies

9 Months Ended

Sep. 30, 2015

Accounting Policies [Abstract]

Business, Basis of Presentation and Significant Accounting Policies

Note 1 – Business, Basis of Presentation and Significant Accounting Policies

Nature of the Business

MasTec, Inc. (collectively with its subsidiaries, “MasTec” or the “Company”) is a leading infrastructure construction company operating mainly throughout North America across a range of industries. The Company’s primary activities include the engineering, building, installation, maintenance and upgrade of communications, energy and utility infrastructure, such as: wireless, wireline/fiber and satellite communications; petroleum and natural gas pipeline infrastructure; electrical utility transmission and distribution; power generation; and industrial infrastructure. MasTec’s customers are primarily in these industries. MasTec reports its results under five reportable segments: (1) Communications; (2) Oil and Gas; (3) Electrical Transmission; (4) Power Generation and Industrial; and (5) Other.

Basis of Presentation

The accompanying condensed unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions for Form 10-Q and Rule 10-01 of Regulation S-X. Pursuant to these rules and regulations, certain information and footnote disclosures normally included in the annual audited consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The accompanying condensed consolidated balance sheet as of December 31, 2014 is derived from the Company’s audited financial statements as of that date. Because certain information and footnote disclosures have been condensed or omitted, these condensed unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto as of and for the year ended December 31, 2014 contained in the 2014 Form 10-K. In management’s opinion, all normal and recurring adjustments considered necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented have been included. Certain prior year amounts have been reclassified to conform to the current period presentation. Interim period operating results do not necessarily indicate the results that may be expected for any other interim period or for the full fiscal year. The Company believes that the disclosures made in these condensed unaudited consolidated financial statements are adequate to make the information not misleading. In these condensed unaudited consolidated financial statements, “$” means U.S. dollars unless otherwise noted.

Principles of Consolidation

The accompanying condensed unaudited consolidated financial statements include MasTec, Inc. and its subsidiaries and include the accounts of all majority owned subsidiaries over which the Company exercises control and, when applicable, entities in which the Company has a controlling financial interest. Other parties’ interests in companies for which MasTec exercises control and has a controlling financial interest are reported as non-controlling interests within equity. Net income or loss attributable to non-controlling interests is reported as a separate line item below net income or loss. The Company’s investments in entities in which the Company does not have a controlling interest, but for which it has the ability to exert significant influence, are accounted for using the equity method of accounting. Equity method investments are recorded as other long-term assets in the condensed unaudited consolidated balance sheets. Income or loss from these investments is recorded within other income or expense in the condensed unaudited consolidated statements of operations. The cost method is used for investments in entities in which the Company does not have the ability to exert significant influence. All significant intercompany balances and transactions have been eliminated in consolidation. The assets and liabilities of foreign subsidiaries with a functional currency other than the U.S. dollar are translated into U.S. dollars at period-end exchange rates, with resulting translation gains or losses accumulated within other comprehensive income or loss. Revenue and expenses are translated into U.S. dollars at average rates of exchange during the applicable period. Substantially all of the Company’s foreign operations use the local currency as the functional currency. Gains or losses resulting from transactions executed in a foreign currency are included in other income or expense, net. The Company does not currently have subsidiaries that operate in highly inflationary environments. The results of operations and financial position of any discontinued operations are aggregated and presented separately from the Company’s continuing operations in the condensed unaudited consolidated financial statements for all periods presented.

Restatement of Previously Reported Condensed Unaudited Consolidated Financial Statements

As disclosed in the 2014 Form 10-K, the Company restated its condensed unaudited consolidated financial statements for the three and nine month periods ended September 30, 2014 and presented these restated results in Note 2 - Independent Investigation of the Audit Committee and Related Restatements of the 2014 Form 10-K. The condensed unaudited consolidated financial statements, along with the related notes thereto as of and for the three and nine month periods ended September 30, 2014 reflect these restatements. The restatement adjustments had the following effects on the 2014 periods:

• An increase in revenue of $5.9 million and $2.4 million for the three and nine month periods ended September 30, 2014, respectively, associated with changes in cost-to-complete estimates on projects accounted for under the percentage-of-completion method, primarily in the Electrical Transmission segment;

• Immaterial adjustments in costs of revenues, excluding depreciation and amortization, for the three and nine month periods ended September 30, 2014;

• An increase in income tax expense of $2.3 million and $0.9 million for the three and nine month periods ended September 30, 2014, respectively, representing the tax effects of the adjustments;

• An increase in net income from continuing operations of $3.7 million and $1.5 million, respectively, for the three and nine month periods ended September 30, 2014; and

• An increase in basic earnings per share from continuing operations of $0.04, an increase in total basic earnings per share of $0.05, and an increase in diluted earnings per share of $0.04 for the three month period ended September 30, 2014, respectively. Basic, total basic and diluted earnings per share each increased by $0.02 for the nine month period ended September 30, 2014.

In addition, there were the following balance sheet effects:

• a reclassification adjustment associated with cost-to-complete estimates that decreased costs and earnings in excess of billings and other current liabilities by $5.3 million, partially offset by an increase in costs and earnings in excess of billings of $1.1 million from other cost-to-complete estimate changes, primarily in the Electrical Transmission segment, for a net decrease in cost in excess of billings and earnings of $4.2 million as of September 30, 2014;

• a decrease in billings in excess of costs and earnings of $1.3 million; and

• an increase in current taxes payable of $0.9 million, as well as other immaterial adjustments within various segments.

Investments in Affiliates and Other Entities

In the ordinary course of business, the Company enters into various investment arrangements, which may include equity or other interests in business entities, including contractual joint ventures or other forms of equity participation. These investment arrangements may include financing arrangements, such as the extension of loans. See Note 3 - Acquisitions and Note 5 - Fair Value of Financial Instruments for discussion pertaining to certain of the Company’s cost and equity method investments and other investment arrangements. In connection with certain of these investment arrangements, the Company provides infrastructure construction services to or through its equity investees and/or contractual joint ventures. Management determines whether such investment arrangements involve a variable interest entity (“VIE”) based on the characteristics of the particular entity. If an entity is determined to be a VIE, then management determines if the Company is the primary beneficiary of the entity and whether or not consolidation of the VIE within the Company's financial statements is required. The primary beneficiary consolidating the VIE must normally have both (i) the power to direct the primary activities of the VIE and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE, which, in either case, could be significant to the VIE. If management determines that the Company is the primary beneficiary of a VIE, then the VIE would be consolidated, and the other party’s equity interest in the VIE would be accounted for as a non-controlling interest. As of September 30, 2015, the Company determined that certain of its investment arrangements were VIEs, but that it was not the primary beneficiary. In arrangements in which the Company has an undivided interest in the assets, liabilities, revenues and profits or losses of an unincorporated entity, such amounts are consolidated on a basis proportional to the Company’s ownership interest in the unincorporated entity.

Management Estimates

The preparation of financial statements in conformity with U.S. GAAP requires the use of estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Key estimates include: the recognition of revenue and project profit or loss (which the Company defines as project revenue, less project costs of revenue, including depreciation), in particular, on long-term construction contracts, or other projects accounted for under the percentage-of-completion method, for which the recorded amounts require estimates of costs to complete projects, ultimate project profit and the amount of contract price adjustments that are probable; allowances for doubtful accounts; estimated fair values of goodwill and intangible assets and liabilities, acquisition-related contingent consideration and investments in cost and equity method investees; asset lives used in computing depreciation and amortization; accrued self-insured claims; share-based compensation; accounting for income taxes; and the estimated impact of contingencies and ongoing litigation. While management believes that such estimates are fair when considered in conjunction with its consolidated financial position and results of operations taken as a whole, actual results could differ from those estimates and such differences could be material to the condensed unaudited consolidated financial statements.

Significant Accounting Policies

Revenue Recognition

Revenue is derived from projects performed under master and other service agreements as well as from fixed price contracts for specific projects or jobs requiring the construction and installation of an entire infrastructure system or specified units within an entire infrastructure system. The Company frequently provides maintenance, installation and repair work under unit price or fixed price master service or other service agreements that are renewed on a periodic basis. Revenue and related costs for master and other service agreements billed on a time and materials basis are recognized as the services are rendered. Revenue derived from projects performed under master service and other service agreements totaled 44% and 43% of revenue for the three month periods ended September 30, 2015 and 2014, respectively, and totaled 47% and 49% of revenue, respectively, for the nine month periods ended September 30, 2015 and 2014. The Company also performs services under master and other service agreements on a fixed fee basis, under which MasTec furnishes specified units of service for a fixed price per unit of service and revenue is recognized as the services are rendered. Revenue from fixed price contracts provides for a fixed amount of revenue for the entire project, subject to certain additions for changed scope or specifications. Revenue from these contracts, as well as for certain projects pursuant to master and other service agreements, is recognized using the percentage-of-completion method, under which the percentage of revenue to be recognized for a given project is measured by the percentage of costs incurred to date on the contract to the total estimated costs for the contract. Such contracts provide that the customer accept completion of progress to date and compensate the Company for services rendered, which may be measured in terms of costs incurred, units installed, hours expended or some other measure of progress. Contract costs include all direct materials, labor and subcontracted costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and the operational costs of capital equipment (excluding depreciation). Much of the materials associated with the Company’s work are customer-furnished and are therefore not included in contract revenue and costs.

The estimation process for revenue recognized under the percentage-of-completion method is based on the professional knowledge and experience of the Company’s engineers, project managers and financial professionals. Management reviews estimates of contract revenue and costs on an ongoing basis. Changes in job performance, job conditions and final contract settlements are factors that influence management’s assessment of total contract value and total estimated costs to complete those contracts and, therefore, the Company’s profit recognition. Changes in these factors may result in revisions to costs and income, and their effects are recognized in the period in which the revisions are determined, which could materially affect the Company’s results of operations in the period in which such changes are recognized. Excluding the effects of project losses of $21.4 million on a Canadian wind project and $8.3 million on a non-controlled proportionately consolidated Canadian joint venture for the nine month period ended September 30, 2015, project profit was affected by less than 5% for both the nine month periods ended September 30, 2015 and 2014 as a result of changes in contract estimates included in projects that were in process as of December 31, 2014 and 2013, respectively. Provisions for losses on uncompleted contracts are made in the period in which such losses are determined to be probable and the amount can be reasonably estimated. The majority of fixed price contracts are generally completed within one year.

The Company may incur costs subject to change orders, whether approved or unapproved by the customer, and/or claims related to certain contracts. Management determines the probability that such costs will be recovered based upon engineering studies and legal opinions, past practices with the customer, specific discussions, correspondence or preliminary negotiations with the customer. The Company treats project costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, or defers costs and/or recognizes revenue up to the amount of the related cost if it is probable that the contract price will be adjusted and can be reliably estimated. As of September 30, 2015 and December 31, 2014, the Company had approximately $28 million and $87 million, respectively, of change orders and/or claims that had been included as contract price adjustments on certain contracts that were in the process of being resolved in the normal course of business, including through negotiation, arbitration and other proceedings. These contract price adjustments, which are included within costs and earnings in excess of billings, or billed accounts receivable as appropriate, represent management’s best estimate of contract revenue that has been or will be earned and that management believes is probable of collection. As of both September 30, 2015 and December 31, 2014, outstanding change orders and/or claims were derived from contracts in the Electrical Transmission and Oil and Gas segments. The Company actively engages in substantive meetings with these customers to complete the final approval process and expects these processes to be completed within one year. The amounts ultimately realized upon final acceptance by its customers could be higher or lower than such estimated amounts.

Billings in excess of costs and estimated earnings on uncompleted contracts are classified as current liabilities. Costs and estimated earnings in excess of billings, or work in process, is classified within current assets for the majority of the Company’s projects. Work in process on contracts is based on work performed but not yet billed to customers as per individual contract terms.

Except for adoption of the accounting pronouncement discussed below, there have been no material changes to the significant accounting policies set forth in the 2014 Form 10-K.

New Accounting Pronouncements

Accounting Standards Not Yet Adopted

In September 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments (“ASU 2015-16”). ASU 2015-16 eliminates the requirement to retrospectively account for adjustments to provisional amounts within the measurement period recognized at the acquisition date in a business combination. ASU 2015-16 requires that these adjustments be recognized in the reporting period in which the adjustment amounts are determined and be calculated as if the accounting had been completed as of the acquisition date. ASU 2015-16 is effective prospectively for fiscal years, and for interim periods within those years, beginning after December 15, 2015. Early application is permitted. The Company is currently evaluating the impact of this ASU on its consolidated financial statements.

In July 2015, the FASB issued ASU 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory (“ASU 2015-11”). ASU 2015-11 requires that inventory measured using any method other than last-in, first out (“LIFO”) or the retail inventory method to be subsequently measured at the lower of cost or net realizable value, rather than at the lower of cost or market value. Under this ASU, subsequent measurement of inventory using the LIFO and retail inventory method is unchanged. ASU 2015-11 is effective prospectively for fiscal years, and for interim periods within those years, beginning after December 15, 2016. Early application is permitted. The Company is currently evaluating the impact of this ASU on its consolidated financial statements.

In April 2015, the FASB issued ASU 2015-05, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. ASU 2015-05 provides guidance for determining whether a cloud computing arrangement includes a software license and requires that all software licenses within the scope of Subtopic 350-40 be accounted for in a manner consistent with other licenses of intangible assets. ASU 2015-05 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early application is permitted. Retrospective application is permitted for all relevant prior periods. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements.

In April 2015, the FASB issued ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03”). ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented as a direct deduction from the carrying amount of the debt, consistent with debt discounts. ASU 2015-03 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early application is permitted. Retrospective application is required for all relevant prior periods. In August 2015, the FASB issued ASU 2015-15, Interest - Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements - Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting (SEC Update) (“ASU 2015-15”). ASU 2015-15 clarifies that, subsequent to adoption of ASU 2015-03, an entity has the option to defer and present debt issuance costs from line-of-credit arrangements as an asset and subsequently amortize the costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. The Company does not expect the adoption of ASU 2015-03 or ASU 2015-15 to have a material impact on its consolidated financial statements.

In February 2015, the FASB issued ASU 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis (“ASU 2015-02”). ASU 2015-02 changes the evaluation that a reporting entity must perform to determine whether it should consolidate certain types of legal entities, reduces the number of consolidation models and places emphasis on risk of loss when determining a controlling financial interest. Under ASU 2015-02, all entities are within the scope of Accounting Standards Codification (“ASC”) Subtopic 810, Consolidation, including limited partnerships and similar legal entities, unless a scope exception applies. The presumption that a general partner controls a limited partnership has been eliminated. In addition, fees paid to decision makers that meet certain conditions no longer cause consolidation of VIEs in certain instances. The amendments place more emphasis on variable interests other than fee arrangements and reduce the extent to which related party arrangements cause an entity to be considered a primary beneficiary. ASU 2015-02 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early application is permitted. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements.

In January 2015, the FASB issued ASU 2015-01, Income Statement - Extraordinary and Unusual Items (Subtopic 225-20): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items (“ASU 2015-01”). ASU 2015-01 eliminates the presentation and disclosure requirements of extraordinary items because it was unclear when an item should be considered both unusual and infrequent and was extremely rare in practice. ASU 2015-01 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. The Company does not expect the adoption of this ASU to have an impact on its consolidated financial statements.

In November 2014, the FASB issued ASU 2014-16, Derivatives and Hedging (Topic 815): Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share is More Akin to Debt or to Equity (a consensus of the FASB Emerging Issues Task Force) (“ASU 2014-16”). The amendments in ASU 2014-16 do not change the current criteria in U.S. GAAP for determining when separation of certain embedded derivative features in a hybrid financial instrument is required. Rather, ASU 2014-16 clarifies how current U.S. GAAP should be interpreted in evaluating the economic characteristics and risks of a host contract in a hybrid financial instrument that is issued in the form of a share. ASU 2014-16 is effective for existing hybrid financial instruments issued in the form of a share on a modified retrospective basis for fiscal years, and for interim periods within those years, beginning after December 15, 2015. Retrospective application is permitted for all relevant prior periods. The Company does not expect the adoption of this ASU to have an impact on its consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”). The core principle of this ASU is that a company will recognize revenue when it transfers goods or services to customers in an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under current guidance and will be required to disclose information about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including disclosure of assumptions and estimates where significant judgment has been applied. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which delayed the effective date of ASU 2014-09 by one year. ASU 2014-09, as amended, is effective using either the retrospective or cumulative effect transition method for fiscal years, and for interim periods within those years, beginning after December 15, 2017. Early application is permitted, but not before fiscal years, and interim periods within those years, beginning after December 15, 2016. The Company is currently determining which transition method will be used and evaluating the potential impact of this ASU on its consolidated financial statements.

Recently Adopted Accounting Pronouncements

In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity (“ASU 2014-08”). ASU 2014-08 changes the requirements for reporting discontinued operations and requires additional disclosures about discontinued operations. Only disposals of components of an entity representing a strategic shift that has, or will have, a major effect on an entity’s operations and financial results should be reported as discontinued operations under ASU 2014-08. Examples include a disposal of a major geographical area, a major line of business, or a major equity method investment. ASU 2014-08 also requires expanded disclosure about discontinued operations and requires disclosure about individually significant dispositions that do not qualify as a discontinued operation. ASU 2014-08 is effective prospectively for fiscal years, and for interim periods within those years, beginning after December 15, 2014. The Company adopted ASU 2014-08 as of January 1, 2015. The adoption of this ASU did not have an impact on the Company’s condensed unaudited consolidated financial statements, but could impact whether future disposals of operations would qualify as discontinued operations.

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Condensed Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 7,442	$ 49,125	$ (2,766)	$ 94,855
Other comprehensive (loss) income (See Note 12):
Foreign currency translation adjustments, net of tax	(13,330)	(12,951)	(32,050)	(10,611)
Comprehensive (loss) income	(5,888)	36,174	(34,816)	84,244
Comprehensive (loss) income attributable to non-controlling interests	(176)	139	(420)	48
Comprehensive (loss) income attributable to MasTec, Inc.	$ (5,712)	$ 36,035	$ (34,396)	$ 84,196

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Other Retirement Plans

9 Months Ended

Sep. 30, 2015

Multiemployer Plans [Abstract]

Other Retirement Plans

Note 11 – Other Retirement Plans

Multi-Employer Plans. Certain of MasTec’s subsidiaries, including certain subsidiaries in Canada, contribute amounts to multi-employer pension and other multi-employer benefit plans and trusts, which are recorded as a component of employee wages and salaries within costs of revenue, excluding depreciation and amortization. Contributions are generally based on fixed amounts per hour per employee for employees covered under these plans. Multi-employer plan contribution rates are determined annually and assessed on a “pay-as-you-go” basis based on union employee payrolls. Union payrolls cannot be determined for future periods because the number of union employees employed at any given time, and the plans in which they may participate, vary depending upon the location and number of ongoing projects at a given time and the need for union resources in connection with those projects.Total contributions to multi-employer plans, and the related number of employees covered by these plans, including with respect to the Company’s Canadian operations, for the periods indicated were as follows:

	Multi-Employer Plans
	Covered Employees		Contributions (in millions)
	Low	High	Pension		Post-Retirement Benefit		Total
For the Three Months Ended September 30:
2015	1,689	2,463	$	7.4	$	2.2	$	9.6
2014	2,029	2,167	$	11.6	$	1.1	$	12.7
For the Nine Months Ended September 30:
2015	590	2,463	$	20.0	$	6.6	$	26.6
2014	1,098	2,167	$	27.3	$	2.5	$	29.8

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Commitments and Contingencies (Collective Bargaining Agreements and Multi-Employer Plans) (Narrative) (Details) - USD ($)		9 Months Ended
	Mar. 14, 2013	Sep. 30, 2015	Dec. 31, 2014	Nov. 30, 2014	Nov. 30, 2011
Loss Contingencies [Line Items]
Multi-employer plans, collective bargaining agreements, description		Certain of MasTec’s subsidiaries are party to various collective bargaining agreements with unions representing certain of their employees. These agreements require the subsidiaries party to the agreements to pay specified wages, provide certain benefits to their union employees and contribute certain amounts to multi-employer pension plans and employee benefit trusts. The collective bargaining agreements expire at various times and have typically been renegotiated and renewed on terms similar to the ones contained in the expiring agreements.
Multi-Employer Plans, Pension [Member] | Plans from Which the Company Terminated Participation in 2014 [Member]
Loss Contingencies [Line Items]
Multi-employer plans, withdrawal liability				$ 0
Multi-Employer Plans, Pension [Member] | Central States Southeast and Southwest Areas Pension Fund [Member]
Loss Contingencies [Line Items]
Multi-employer plans, withdrawal liability		$ 3,300,000	$ 4,200,000		$ 6,400,000
Multi-Employer Plans, Pension [Member] | Central States Southeast and Southwest Areas Pension Fund [Member] | Withdrawal from Multi-Employer Defined Benefit Plan [Member]
Loss Contingencies [Line Items]
Loss contingency, evaluation of estimated loss		Additionally, in November 2011, the Company, along with other members of the PLCA, voluntarily withdrew from the Central States Southeast and Southwest Areas Pension Fund (“Central States”), a defined benefit multi-employer pension plan that is in critical status. In connection with this withdrawal, a $6.4 million withdrawal liability was established based on an estimate provided by the Central States administrator as of the date of withdrawal. The Company began paying installments towards this withdrawal liability in 2013, of which $3.3 million and $4.2 million was outstanding as of September 30, 2015 and December 31, 2014, respectively. The Company withdrew from Central States in order to mitigate its liability in connection with the plan; however, Central States has asserted that the PLCA members did not effectively withdraw in 2011 and are, therefore, responsible for a withdrawal liability that includes 2011 contribution amounts. By letter dated March 14, 2013, Central States demanded $11 million in withdrawal liability from the Company, which included 2011 contribution amounts. The Company is vigorously opposing this demand because it believes that it legally and effectively withdrew from Central States in November 2011. If Central States were to prevail in its assertion that the Company withdrew after that date, then the initial amount of the Company’s withdrawal liability would increase to approximately $11 million.
Loss contingency, damages sought, value	$ 11,000,000
Loss contingency, maximum loss		$ 11,000,000

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Commitments and Contingencies (Litigation) (Narrative) (Details) $ in Millions	1 Months Ended				3 Months Ended	9 Months Ended	12 Months Ended
	Aug. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jun. 30, 2013 USD ($)	Oct. 31, 2012 USD ($) mi	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2011
PPL [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Contract price, litigation (in dollars)				$ 206.0
Construction contract, number of miles of transmission line | mi				100
Claims sought, litigation (in dollars)		$ 40.0
PPL [Member] | Settled Litigation [Member] | Other Expense [Member] | Electrical Transmission [Member]
Loss Contingencies [Line Items]
Court mandated mediation settlement, charge (in dollars)					$ 12.2	$ 12.2
Sunlight Entities [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Claims sought, litigation (in dollars)			$ 60.0
Number of public solar projects							3
Number of arbitration proceedings							3
Arbitration award, litigation (in dollars)	$ 68.0

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Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 29, 2015
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Entity Registrant Name	MASTEC INC
Trading Symbol	MTZ
Entity Central Index Key	0000015615
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		79,887,902

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Equity

9 Months Ended

Sep. 30, 2015

Equity [Abstract]

Equity

Note 12 – Equity

Share Activity

During the fourth quarter of 2014, the Company’s Board of Directors authorized a $100 million share repurchase program (the “2014 Share Repurchase Program”), which provided the Company the ability to repurchase shares of its common stock from time to time in open market transactions or in privately-negotiated transactions, in accordance with applicable securities laws. Repurchased shares are held in the Company’s treasury. During the first half of 2015, the Company repurchased 5.2 million shares of its common stock for an aggregate purchase price of $100 million, which completed the 2014 Share Repurchase Program.

Share Activity (in thousands):	Common Shares Outstanding		Treasury Shares
Balance as of December 31, 2014	84,739		2,876
Shares issued:
Stock option exercises	72
Restricted share awards	199
Common stock repurchases	(5,218	)	5,218
Other, net	65
Balance as of September 30, 2015	79,857		8,094

Accumulated Other Comprehensive Loss

Accumulated other comprehensive losses totaled $66.1 million and $34.0 million as of September 30, 2015 and December 31, 2014, respectively. For the three and nine month periods ended September 30, 2015, unrealized foreign currency translation losses totaled $13.3 million and $32.1 million, respectively. For the three and nine month periods ended September 30, 2014, unrealized foreign currency translation losses totaled $13.0 million and $10.6 million, respectively. Unrealized foreign currency gains and losses relate primarily to fluctuations in foreign currency exchange rates of the Company’s foreign subsidiaries with a functional currency other than the U.S. dollar. Foreign currency activity, which has grown in recent years due to acquisitions, is related primarily to the Company’s Canadian operations.

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Equity (Share Activity) (Narrative) (Details) - 2014 Share Repurchase Program [Member] - USD ($) shares in Thousands, $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Equity, Treasury Stock [Line Items]
Share repurchase program, amount authorized, value			$ 100
Treasury stock acquired, value	$ 100
Common Stock [Member]
Equity, Treasury Stock [Line Items]
Common stock repurchases (in shares)		5,218

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Segments and Related Information (Schedule of Significant Customers, Revenue Concentration Information) (Details) - Customer Concentration Risk [Member] - Revenue [Member]		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Communications [Member] | AT&T (including DIRECTV) [Member]
Revenue, Significant Customers [Line Items]
Significant customers, percentage of total consolidated revenue	[1],[2]	31.00%	28.00%	31.00%	33.00%
Oil and Gas [Member] | Enbridge, Inc. [Member]
Revenue, Significant Customers [Line Items]
Significant customers, percentage of total consolidated revenue	[3]	0.00%	10.00%	1.00%	10.00%

[1] DIRECTV® was acquired by AT&T in July 2015. Revenue from DIRECTV® is presented on a combined basis with AT&T for all periods.

[2] The Company’s relationship with AT&T is based upon multiple separate master service agreements, other service agreements and construction/installation contracts for AT&T’s (i) wireless, (ii) wireline/fiber, (iii) home security and automation businesses, and (iv) for DIRECTV® services, is based upon an agreement to provide installation and maintenance services. Revenue from AT&T is included in the Communications segment.

[3] The Company’s relationship with Enbridge, Inc. is based upon various construction contracts for natural gas pipelines. Revenue from Enbridge, Inc. is included in the Oil and Gas segment.

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Condensed Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 7,154	$ 24,059
Accounts receivable, net of allowance	1,023,663	1,303,552
Inventories, net	90,512	112,804
Prepaid expenses and other current assets	116,985	91,336
Total current assets	1,238,314	1,531,751
Property and equipment, net	586,993	623,118
Goodwill	1,064,822	1,082,466
Other intangible assets, net	218,761	250,373
Other long-term assets	136,896	76,272
Total assets	3,245,786	3,563,980
Current liabilities:
Current maturities of long-term debt	78,827	73,631
Accounts payable	376,836	485,347
Accrued salaries and wages	80,979	60,528
Other accrued expenses	81,363	89,343
Acquisition-related contingent consideration, current	11,441	49,798
Billings in excess of costs and earnings	123,623	155,674
Other current liabilities	34,341	66,527
Total current liabilities	787,410	980,848
Acquisition-related contingent consideration, net of current portion	83,593	103,515
Long-term debt	1,098,585	1,061,159
Long-term deferred tax liabilities, net	186,642	203,476
Other long-term liabilities	65,072	66,907
Total liabilities	$ 2,221,302	$ 2,415,905
Commitments and contingencies (See Note 15)
Equity
Preferred stock, $1.00 par value: authorized shares - 5,000,000; issued and outstanding shares – none	$ 0	$ 0
Common stock, $0.10 par value: authorized shares - 145,000,000; issued shares - 87,951,049 and 87,614,955 as of September 30, 2015 and December 31, 2014, respectively	8,795	8,762
Capital surplus	767,881	756,688
Retained earnings	455,441	457,788
Accumulated other comprehensive loss	(66,054)	(34,004)
Treasury stock, at cost: 8,094,004 and 2,876,311 shares as of September 30, 2015 and December 31, 2014, respectively	(145,573)	(45,573)
Total MasTec, Inc. shareholders’ equity	1,020,490	1,143,661
Non-controlling interests	3,994	4,414
Total equity	1,024,484	1,148,075
Total liabilities and equity	$ 3,245,786	$ 3,563,980

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Accounts Receivable, Net of Allowance

9 Months Ended

Sep. 30, 2015

Receivables [Abstract]

Accounts Receivable, Net of Allowance

Note 6 - Accounts Receivable, Net of Allowance

The following table provides details of accounts receivable, net of allowance, as of the dates indicated (in millions):

	September 30, 2015			December 31, 2014
Contract billings	$	512.3		$	669.7
Retainage	164.0			162.2
Costs and earnings in excess of billings	356.0			485.6
Accounts receivable, gross	$	1,032.3		$	1,317.5
Less allowance for doubtful accounts	(8.6		)	(13.9		)
Accounts receivable, net	$	1,023.7		$	1,303.6

Retainage, which has been billed, but is not due until the Company’s completion of performance and acceptance by customers, is generally expected to be collected within one year. Receivables expected to be collected beyond one year are recorded within other long-term assets. Provisions for doubtful accounts for the three month periods ended September 30, 2015 and 2014 totaled $1.4 million and $0.3 million, respectively, and for the nine month periods ended September 30, 2015 and 2014 totaled $2.2 million and $1.1 million, respectively. The provision for doubtful accounts for the nine month period ended September 30, 2014 included a reversal of $0.5 million to eliminate a reserve that was not required and should have been reversed in a prior year. Based on materiality considerations, this item was recognized in 2014.

During 2014, the Company entered into a non-recourse financing arrangement, under which certain receivables are purchased by the customer’s bank for a nominal fee. This arrangement improved the collection cycle time of the related receivables, the effect of which amounted to cash collections of approximately $29 million for the nine month period ended September 30, 2015. Cash collected from this arrangement is reflected within cash provided by operating activities. The discount charge amounted to $1.1 million for the nine month period ended September 30, 2015 and is included within interest expense in the consolidated statements of operations.

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Fair Value of Financial Instruments

9 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

Note 5 – Fair Value of Financial Instruments

The Company’s financial instruments include cash and cash equivalents, accounts and notes receivable, cash collateral deposited with insurance carriers, life insurance assets, cost and equity method investments, deferred compensation plan assets and liabilities, accounts payable and other current liabilities, acquisition-related contingent consideration, certain intangible assets and liabilities, including off-market contracts, and debt obligations.

Fair value is the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value guidance establishes a valuation hierarchy, which requires maximizing the use of observable inputs when measuring fair value. The three levels of inputs that may be used are: (i) Level 1 - quoted market prices in active markets for identical assets or liabilities; (ii) Level 2 - observable market based inputs or other observable inputs; and (iii) Level 3 - significant unobservable inputs that cannot be corroborated by observable market data, which are generally determined using valuation models incorporating management estimates of market participant assumptions. In instances in which the inputs used to measure fair value fall into different levels of the fair value hierarchy, the fair value measurement classification is determined based on the lowest level input that is significant to the fair value measurement in its entirety.  Management’s assessment of the significance of a particular item to the fair value measurement in its entirety requires judgment, including the consideration of inputs specific to the asset or liability.

Fair values of financial instruments are estimated using public market prices, quotes from financial institutions and other available information. Due to their short-term maturity, the carrying amounts of cash and cash equivalents, accounts receivable and accounts payable and other current liabilities approximate their fair values. Management believes the carrying values of notes receivable, cash collateral deposited with insurance carriers, deferred compensation plan assets and liabilities and outstanding balances on its credit facilities approximate their fair values. Cost and equity method investments are initially recorded at their cost basis.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

As of September 30, 2015 and December 31, 2014, financial instruments required to be measured at fair value on a recurring basis consisted primarily of acquisition-related contingent consideration liabilities, which represent the estimated fair value of additional future earn-outs payable for acquisitions of businesses (“ASC 805 contingent consideration”), in accordance with U.S. GAAP. The fair value of ASC 805 contingent consideration is based on management estimates and entity-specific assumptions, which are Level 3 inputs, and is evaluated on an ongoing basis. As of September 30, 2015 and December 31, 2014, the fair value of the Company’s ASC 805 contingent consideration totaled $94.0 million and $146.1 million, respectively.

There were no additions to ASC 805 contingent consideration from new business combinations for the three month periods ended September 30, 2015 or 2014, or for the nine month period ended September 30, 2015. Additions from new business combinations were $33.6 million for the nine month period ended September 30, 2014. The Company paid approximately $5.5 million, $37.7 million, $1.3 million and $48.3 million, respectively, in connection with ASC 805 contingent consideration for the three and nine month periods ended September 30, 2015 and 2014. For the three and nine month periods ended September 30, 2015, the Company recognized net reductions of $4.4 million and $8.0 million, respectively, of ASC 805 contingent consideration, which related primarily to finalization of earn-out arrangements in the Oil and Gas, Electrical Transmission and Communications segments, and were recorded within other expense (income), net, in the condensed unaudited consolidated statements of operations. Foreign currency translation gains associated with ASC 805 contingent consideration for the three and nine month periods ended September 30, 2015 and 2014 were $2.8 million, $6.4 million, $2.9 million and $2.5 million, respectively.

Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis

Assets and liabilities recognized or disclosed at fair value on a non-recurring basis, for which remeasurement occurs in the event of an impairment or other measurement event, if applicable, include items such as cost and equity method investments, life insurance assets, long-lived assets, goodwill, other intangible assets and liabilities, including off-market contracts and debt. As of both September 30, 2015 and December 31, 2014, the carrying amount of the Company’s 4.875% senior notes due 2023 (the “4.875% Senior Notes”) totaled $400 million. As of September 30, 2015 and December 31, 2014, the estimated fair value of the Company’s 4.875% Senior Notes, based on quoted market prices in active markets, a Level 1 input, totaled $332.0 million and $375.0 million, respectively.

Cost and Equity Method Investments. The aggregate carrying value of the Company’s cost and equity method investment assets, including long-term receivables from investees and contractual joint ventures, totaled approximately $68.0 million and $17.7 million as of September 30, 2015 and December 31, 2014, respectively. In June 2015, MasTec invested $6 million, and committed to future equity contributions and/or loan guarantees of up to an additional $78 million, for a 33% equity interest in two joint ventures. As of September 30, 2015, the Company had invested $51 million in these joint ventures and expects to satisfy its remaining commitments in the fourth quarter of 2015. From time to time, MasTec may elect to advance additional amounts above its commitments to fund temporary capital requirements. The joint ventures were formed to design, build, own and operate a header system and two pipelines that will transport natural gas.  A subsidiary of MasTec will construct the pipelines, with construction expected to commence in 2016.Each pipeline is planned to interconnect at the United States/Mexico border with pipelines currently under development and construction in Mexico.

The fair values of the Company’s cost and equity method investments are not readily available. The Company is not aware of events or changes in circumstances that would have a significant adverse effect on the carrying values of its cost and/or equity method investments as of September 30, 2015 or December 31, 2014.

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Supplemental Guarantor Financial Information

9 Months Ended

Sep. 30, 2015

Condensed Unaudited Financial Statements, Supplemental Guarantor Information [Abstract]

Supplemental Guarantor Financial Information

Note 17 – Supplemental Guarantor Condensed Unaudited Consolidating Financial Information

The 4.875% Senior Notes are, and the 2011 Convertible Notes and 2009 Convertible Notes through the dates of their maturity in 2014, were, fully and unconditionally guaranteed on an unsecured, unsubordinated, joint and several basis by certain of the Company’s existing and future 100%-owned direct and indirect domestic subsidiaries that are each guarantors of the Credit Facility or other outstanding indebtedness (the “Guarantor Subsidiaries”). The Company’s subsidiaries organized outside of the United States and certain domestic subsidiaries (collectively, the “Non-Guarantor Subsidiaries”) do not guarantee any of these notes. A Guarantor Subsidiary’s guarantee is subject to release in certain customary circumstances, including upon the sale of a majority of the capital stock or substantially all of the assets of such Guarantor Subsidiary, if the Guarantor Subsidiary’s guarantee under the Company’s Credit Facility and other indebtedness is released or discharged (other than due to payment under such guarantee), or when the requirements for legal defeasance are satisfied or the obligations are discharged in accordance with the related indentures.

The following supplemental financial information sets forth the condensed unaudited consolidating balance sheets and the condensed unaudited consolidating statements of operations and comprehensive income and cash flows for the parent company (MasTec, Inc.), the Guarantor Subsidiaries on a combined basis, the Non-Guarantor Subsidiaries on a combined basis and the eliminations necessary to arrive at the information for the Company as reported on a consolidated basis. Eliminations represent adjustments to eliminate investments in subsidiaries and intercompany balances and transactions between or among MasTec, Inc., the Guarantor Subsidiaries and the Non-Guarantor Subsidiaries.  Investments in subsidiaries are accounted for using the equity method for this presentation.

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (in millions)

For the Three Months Ended September 30, 2015	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	963.7		$	149.9		$	(2.6	)	$	1,111.0
Costs of revenue, excluding depreciation and amortization	—			841.9			133.4			(2.6		)	972.7
Depreciation and amortization	—			33.2			9.0			—			42.2
General and administrative expenses	0.7			57.0			6.1			—			63.8
Interest expense (income), net	—			27.7			(15.7		)	—			12.0
Other expense, net	—			6.0			0.7			—			6.7
(Loss) income from continuing operations before income taxes	$	(0.7	)	$	(2.1	)	$	16.4		$	—		$	13.6
Benefit from (provision for) income taxes	0.3			1.3			(7.8		)	—			(6.2		)
Net (loss) income from continuing operations	$	(0.4	)	$	(0.8	)	$	8.6		$	—		$	7.4
Equity in income from subsidiaries, net of tax	8.0			—			—			(8.0		)	—
Net income (loss)	$	7.6		$	(0.8	)	$	8.6		$	(8.0	)	$	7.4
Net loss attributable to non-controlling interests	—			—			(0.2		)	—			(0.2		)
Net income (loss) attributable to MasTec, Inc.	$	7.6		$	(0.8	)	$	8.8		$	(8.0	)	$	7.6
Comprehensive (loss) income	$	(5.7	)	$	(0.8	)	$	(4.8	)	$	5.4		$	(5.9	)

For the Three Months Ended September 30, 2014 (As Restated)	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	1,050.5		$	267.0		$	(2.0	)	$	1,315.5
Costs of revenue, excluding depreciation and amortization	—			893.0			231.9			(2.0		)	1,122.9
Depreciation and amortization	—			30.8			10.9			—			41.7
General and administrative expenses	0.6			50.8			8.5			—			59.9
Interest expense, net	—			11.5			1.1			—			12.6
Other (income) expense, net	—			(1.7		)	0.3			—			(1.4		)
(Loss) income from continuing operations before income taxes	$	(0.6	)	$	66.1		$	14.3		$	—		$	79.8
Benefit from (provision for) income taxes	0.2			(24.2		)	(6.4		)	—			(30.3		)
Net (loss) income from continuing operations	$	(0.4	)	$	41.9		$	7.9		$	—		$	49.4
Net loss from discontinued operations	—			—			(0.3		)	—			(0.3		)
Equity in income from subsidiaries, net of tax	49.3			—			—			(49.3		)	—
Net income (loss)	$	48.9		$	41.9		$	7.6		$	(49.3	)	$	49.1
Net income attributable to non-controlling interests	—			—			0.1			—			0.1
Net income (loss) attributable to MasTec, Inc.	$	48.9		$	41.9		$	7.5		$	(49.3	)	$	49.0
Comprehensive income (loss)	$	36.0		$	41.9		$	(5.3	)	$	(36.4	)	$	36.2

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (in millions)

For the Nine Months Ended September 30, 2015	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	2,657.9		$	530.2		$	(7.2	)	$	3,180.9
Costs of revenue, excluding depreciation and amortization	—			2,309.4			502.9			(7.2		)	2,805.1
Depreciation and amortization	—			98.1			29.9			—			128.0
General and administrative expenses	1.9			184.9			20.3			—			207.1
Interest expense (income), net	—			82.9			(47.1		)	—			35.8
Other expense, net	—			0.4			4.0			—			4.4
(Loss) income from continuing operations before income taxes	$	(1.9	)	$	(17.8	)	$	20.2		$	—		$	0.5
Benefit from (provision for) income taxes	0.8			7.9			(12.0		)	—			(3.3		)
Net loss (income) from continuing operations	$	(1.1	)	$	(9.9	)	$	8.2		$	—		$	(2.8	)
Equity in loss from subsidiaries, net of tax	(1.3		)	—			—			1.3			—
Net (loss) income	$	(2.4	)	$	(9.9	)	$	8.2		$	1.3		$	(2.8	)
Net loss attributable to non-controlling interests	—			—			(0.5		)	—			(0.5		)
Net (loss) income attributable to MasTec, Inc.	$	(2.4	)	$	(9.9	)	$	8.7		$	1.3		$	(2.3	)
Comprehensive (loss) income	$	(34.4	)	$	(9.9	)	$	(23.7	)	$	33.3		$	(34.8	)

For the Nine Months Ended September 30, 2014 (As Restated)	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	2,802.3		$	580.3		$	(2.1	)	$	3,380.5
Costs of revenue, excluding depreciation and amortization	—			2,402.6			514.4			(2.1		)	2,914.9
Depreciation and amortization	—			88.4			23.6			—			112.0
General and administrative expenses	1.8			146.7			19.0			—			167.5
Interest expense, net	—			35.6			2.0			—			37.6
Other (income) expense, net	—			(5.9		)	0.4			—			(5.5		)
(Loss) income from continuing operations before income taxes	$	(1.8	)	$	134.9		$	20.9		$	—		$	154.0
Benefit from (provision for) income taxes	0.7			(52.0		)	(7.3		)	—			(58.6		)
Net (loss) income from continuing operations	$	(1.1	)	$	82.9		$	13.6		$	—		$	95.4
Net loss from discontinued operations	—			—			(0.5		)	—			(0.5		)
Equity in income from subsidiaries, net of tax	95.9			—			—			(95.9		)	—
Net income (loss)	$	94.8		$	82.9		$	13.1		$	(95.9	)	$	94.9
Net loss attributable to non-controlling interests	—			—			(0.1)			—			(0.1)
Net income (loss) attributable to MasTec, Inc.	$	94.8		$	82.9		$	13.2		$	(95.9	)	$	94.8
Comprehensive income (loss)	$	84.2		$	83.0		$	2.4		$	(85.3	)	$	84.2

CONDENSED UNAUDITED CONSOLIDATING BALANCE SHEETS (in millions)

As of September 30, 2015	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Current assets	$	—	$	1,007.7	$	230.6	$	—		$	1,238.3
Property and equipment, net	—		464.9		122.1		—			587.0
Goodwill and other intangible assets, net	—		1,055.6		228.0		—			1,283.6
Investments in and advances to consolidated affiliates, net	2,036.4		95.7		1,083.8		(3,215.9		)	—
Other long-term assets	9.3		38.7		88.9		—			136.9
Total assets	$	2,045.7	$	2,662.6	$	1,753.4	$	(3,215.9	)	$	3,245.8
Liabilities and equity
Total current liabilities	$	—	$	666.6	$	120.8	$	—		$	787.4
Long-term debt	—		1,068.1		30.5		—			1,098.6
Other long-term liabilities	—		227.4		107.9		—			335.3
Total liabilities	$	—	$	1,962.1	$	259.2	$	—		$	2,221.3
Total equity	$	2,045.7	$	700.5	$	1,494.2	$	(3,215.9	)	$	1,024.5
Total liabilities and equity	$	2,045.7	$	2,662.6	$	1,753.4	$	(3,215.9	)	$	3,245.8

As of December 31, 2014	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Current assets	$	—	$	1,249.6	$	282.2	$	—		$	1,531.8
Property and equipment, net	—		472.6		150.5		—			623.1
Goodwill and other intangible assets, net	—		1,068.3		264.5		—			1,332.8
Investments in and advances to consolidated affiliates, net	2,108.4		—		1,097.0		(3,205.4		)	—
Other long-term assets	9.3		28.7		38.3		—			76.3
Total assets	$	2,117.7	$	2,819.2	$	1,832.5	$	(3,205.4	)	$	3,564.0
Liabilities and equity
Total current liabilities	$	—	$	777.4	$	203.4	$	—		$	980.8
Long-term debt	—		1,027.3		33.9		—			1,061.2
Advances from consolidated affiliates, net	—		70.7		—		(70.7		)	—
Other long-term liabilities	—		239.3		134.6		—			373.9
Total liabilities	$	—	$	2,114.7	$	371.9	$	(70.7	)	$	2,415.9
Total equity	$	2,117.7	$	704.5	$	1,460.6	$	(3,134.7	)	$	1,148.1
Total liabilities and equity	$	2,117.7	$	2,819.2	$	1,832.5	$	(3,205.4	)	$	3,564.0

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF CASH FLOWS (in millions)

For the Nine Months Ended September 30, 2015	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash (used in) provided by operating activities	$	(1.1	)	$	317.0		$	(55.3	)	$	—	$	260.6
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	—			(0.1		)	—			—		(0.1		)
Capital expenditures	—			(58.2		)	(12.6		)	—		(70.8		)
Proceeds from sale of property and equipment	—			8.4			1.4			—		9.8
Payments for investments, net	—			(109.3		)	—			—		(109.3		)
Net cash used in investing activities	$	—		$	(159.2	)	$	(11.2	)	$	—	$	(170.5	)
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	—			827.1			502.5			—		1,329.6
Repayments of credit facilities	—			(747.8		)	(492.3		)	—		(1,240.1		)
Repayments of other borrowings and capital lease obligations	—			(36.4		)	(14.9		)	—		(51.3		)
Repurchase of common stock	(100.0		)	—			—			—		(100.0		)
Proceeds from stock-based awards, net of tax withholdings	2.1			(0.4		)	—			—		1.7
Excess tax benefits from stock-based compensation	—			0.1			—			—		0.1
Payments of acquisition-related contingent consideration	—			(37.3		)	(7.5		)	—		(44.8		)
Payments of financing costs	—			(2.4		)	—			—		(2.4		)
Net financing activities and advances from (to) consolidated affiliates	99.0			(169.2		)	70.2			—		—
Net cash provided by (used in) financing activities	$	1.1		$	(166.3	)	$	58.0		$	—	$	(107.2	)
Effect of currency translation on cash	—			—			0.1			—		0.1
Net decrease in cash and cash equivalents	$	—		$	(8.5	)	$	(8.4	)	$	—	$	(16.9	)
Cash and cash equivalents - beginning of period	—			18.5			5.6			—		24.1
Cash and cash equivalents - end of period	$	—		$	10.0		$	(2.8	)	$	—	$	7.2

For the Nine Months Ended September 30, 2014 (As Restated)	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash (used in) provided by operating activities	$	(0.9	)	$	41.1		$	40.8		$	—	$	81.0
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	—			(40.0		)	(122.9		)	—		(162.9		)
Capital expenditures	—			(75.6		)	(15.4		)	—		(91.0		)
Proceeds from sale of property and equipment	—			10.3			1.9			—		12.2
Payments for investments, net	$	—		$	(1.0	)	$	—		$	—	$	(1.0	)
Net cash used in investing activities	$	—		$	(106.3	)	$	(136.4	)	$	—	$	(242.7	)
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	$	—		$	1,122.4		$	197.2		$	—	$	1,319.6
Repayments of credit facilities	—			(723.2		)	(232.0		)	—		(955.2		)
Repayment of senior convertible notes	—			(105.3		)	—			—		(105.3		)
Repayments of other borrowings and capital lease obligations	—			(45.4		)	(8.7		)	—		(54.1		)
Proceeds from stock-based awards, net of tax withholdings	2.9			(2.6		)	—			—		0.3
Excess tax benefits from stock-based compensation	—			3.5			—			—		3.5
Payments of acquisition-related contingent consideration	—			(60.3		)	—			—		(60.3		)
Payments of financing costs	—			(1.5		)	—			—		(1.5		)
Net financing activities and advances (to) from consolidated affiliates	(2.0		)	(125.2		)	127.2			—		—
Net cash provided by financing activities	$	0.9		$	62.4		$	83.7		$	—	$	147.0
Effect of currency translation on cash	—			—			(1.2		)	—		(1.2		)
Net decrease in cash and cash equivalents	$	—		$	(2.8	)	$	(13.1	)	$	—	$	(15.9	)
Cash and cash equivalents - beginning of period	—			5.4			17.6			—		22.9
Cash and cash equivalents - end of period	$	—		$	2.6		$	4.5		$	—	$	7.1

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Income Taxes

9 Months Ended

Sep. 30, 2015

Income Tax Disclosure [Abstract]

Income Taxes

Note 13 - Income Taxes

In determining the quarterly provision for income taxes, management uses an estimated annual effective tax rate based on forecasted annual pre-tax income, permanent tax differences, statutory tax rates and tax planning opportunities in the various jurisdictions in which the Company operates. The effect of significant discrete items is separately recognized in the quarter(s) in which they occur. For the nine month period ended September 30, 2015, the Company incurred $2.6 million of income tax expense in connection with the non-recurring cumulative revaluation of certain deferred tax liabilities pursuant to an Alberta provincial income tax law that was enacted as of June 29, 2015. As of September 30, 2015, the Company had $26.9 million of current deferred tax assets, net, and $186.6 million of long-term deferred tax liabilities, net. As of December 31, 2014, current deferred tax assets, net, totaled $31.7 million and long-term deferred tax liabilities, net, totaled $203.5 million.

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Segments and Related Information (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segment	Sep. 30, 2014 USD ($)
Segments and Related Information [Line Items]
Segment reporting information, factors used to identify entity's reportable segments			MasTec manages its continuing operations under five operating segments, which represent MasTec’s five reportable segments: (1) Communications; (2) Oil and Gas; (3) Electrical Transmission; (4) Power Generation and Industrial and (5) Other. This structure is generally focused on broad end-user markets for MasTec’s labor-based construction services.
Number of operating segments | segment			5
Number of reportable segments | segment			5
Segment reporting information, description of products and services			All five reportable segments derive their revenue from the engineering, installation and maintenance of infrastructure, primarily in North America.
Segment reporting, description of all other segments			The Other segment primarily includes a proportionately consolidated joint venture and other small business units that perform construction services for a variety of end-markets in Canada, Mexico and elsewhere internationally.
General and administrative expenses (in dollars)	$ 63,798	$ 59,889	$ 207,077	$ 167,454
Corporate [Member] | Audit Committee Independent Investigation [Member]
Segments and Related Information [Line Items]
General and administrative expenses (in dollars)	4,100		$ 14,600
Communications [Member]
Segments and Related Information [Line Items]
Segment reporting information, description of products and services			The Communications segment performs engineering, construction and maintenance of communications infrastructure primarily related to wireless and wireline/fiber communications and install-to-the-home customers, and, to a lesser extent, infrastructure for electrical utilities.
Business combinations, acquisition integration costs (in dollars)	1,200		$ 17,800
Oil and Gas [Member]
Segments and Related Information [Line Items]
Segment reporting information, description of products and services			MasTec performs engineering, construction and maintenance services on oil and natural gas pipelines and processing facilities for the energy and utilities industries through its Oil and Gas segment.
Electrical Transmission [Member]
Segments and Related Information [Line Items]
Segment reporting information, description of products and services			The Electrical Transmission segment primarily serves the energy and utility industries through the engineering, construction and maintenance of electrical transmission lines and substations.
Electrical Transmission [Member] | PPL [Member] | Settled Litigation [Member] | Other Expense [Member]
Segments and Related Information [Line Items]
Court mandated mediation settlement, charge (in dollars)	12,200		$ 12,200
Power Generation and Industrial [Member]
Segments and Related Information [Line Items]
Segment reporting information, description of products and services			The Power Generation and Industrial segment primarily serves energy, utility and other end-markets through the installation and construction of conventional and renewable power facilities, related electrical transmission infrastructure, ethanol facilities and various types of industrial infrastructure.
Power Generation and Industrial [Member] | Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member]
Segments and Related Information [Line Items]
Project losses (in dollars)	3,800		$ 21,400
Other [Member] | Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member] | Pacer [Member] | Joint Venture [Member]
Segments and Related Information [Line Items]
Project losses (in dollars)	$ 2,800		$ 8,300

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Lease Obligations

9 Months Ended

Sep. 30, 2015

Leases [Abstract]

Lease Obligations

Note 9 - Lease Obligations

Capital Leases

MasTec enters into agreements that provide financing for machinery and equipment, which expire on various dates. The gross amount of assets held under capital leases as of September 30, 2015 and December 31, 2014, which are included within property and equipment, net, in the consolidated balance sheets, totaled $301.5 million and $281.6 million, respectively. Assets held under capital leases, net of accumulated depreciation, totaled $212.5 million and $217.8 million as of September 30, 2015 and December 31, 2014, respectively.

Operating Leases

In the ordinary course of business, the Company enters into non-cancelable operating leases for certain of its facility, vehicle and equipment needs, including related party leases. Rent expense relating to operating leases that have non-cancelable terms in excess of one year totaled approximately $20.5 million and $18.1 million for the three month periods ended September 30, 2015 and 2014, respectively, and totaled $59.9 million and $51.5 million for the nine month periods ended September 30, 2015 and 2014, respectively. The Company also incurred expenses relating to facilities, vehicles and equipment having original terms of one year or less totaling approximately $51.4 million and $54.5 million for the three month periods ended September 30, 2015 and 2014, respectively, and totaling $148.5 million and $142.6 million for the nine month periods ended September 30, 2015 and 2014, respectively.

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Debt (Schedule of Carrying Values of Debt) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Capital lease obligations	$ 148,100	$ 176,500
Total debt	1,177,400	1,134,800
Less current maturities	(78,827)	(73,631)
Long-term debt	$ 1,098,585	1,061,159
Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maturity date	Oct. 29, 2018
Credit Facility [Member] | Revolving Loans [Member]
Debt Instrument [Line Items]
Carrying value of debt	$ 349,300	282,700
Credit Facility [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Line of credit facility, maturity date	Nov. 21, 2019
Carrying value of debt	$ 250,000	250,000
Senior Notes [Member] | 4.875% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Mar. 15, 2023
Carrying value of debt	$ 400,000	400,000
Other Credit Facilities [Member]
Debt Instrument [Line Items]
Carrying value of debt	$ 9,500	1,200
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital lease obligations, expiration date, range, end	Jun. 13, 2021
Notes Payable [Member] | Equipment [Member]
Debt Instrument [Line Items]
Notes payable, maturity date, range, end	Jun. 30, 2018
Carrying value of debt	$ 20,500	$ 24,400

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Property and Equipment, Net

9 Months Ended

Sep. 30, 2015

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

Note 7 - Property and Equipment, Net

The following table provides details of property and equipment, net, including property and equipment held under capital leases as of the dates indicated (in millions):

	September 30, 2015			December 31, 2014
Land	$	4.6		$	4.6
Buildings and leasehold improvements	21.0			19.9
Machinery and equipment	966.6			926.1
Office furniture and equipment	135.6			126.1
Construction in progress	10.8			12.0
Total property and equipment	$	1,138.6		$	1,088.7
Less accumulated depreciation and amortization	(551.6		)	(465.6		)
Property and equipment, net	$	587.0		$	623.1

The gross amount of capitalized internal-use software, which is included within office furniture and equipment, totaled $100.4 million and $92.7 million as of September 30, 2015 and December 31, 2014, respectively. Capitalized internal-use software, net of accumulated amortization, totaled $35.3 million and $33.6 million as of September 30, 2015 and December 31, 2014, respectively. Depreciation and amortization expense associated with property and equipment for the three month periods ended September 30, 2015 and 2014 totaled $35.3 million and $35.2 million, respectively, and totaled $106.6 million and $95.0 million for the nine month periods ended September 30, 2015 and 2014, respectively.

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Debt

9 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Debt

Note 8 - Debt

The following table provides details of the carrying values of debt as of the dates indicated (in millions):

Description	Maturity Date	September 30, 2015			December 31, 2014
Senior secured credit facility:
Revolving loans	October 29, 2018	$	349.3		$	282.7
Term loan	November 21, 2019	250.0			250.0
4.875% senior notes	March 15, 2023	400.0			400.0
Other credit facilities	Varies	9.5			1.2
Capital lease obligations, weighted average interest rate of 2.8%	In installments through June 13, 2021	148.1			176.5
Notes payable, equipment, weighted average interest rate of 2.7%	In installments through June 30, 2018	20.5			24.4
Total debt		$	1,177.4		$	1,134.8
Less current maturities		(78.8		)	(73.6		)
Long-term debt		$	1,098.6		$	1,061.2

Senior Secured Credit Facility

The Company has a senior secured credit facility, referred to as the Credit Facility. Under the Credit Facility, aggregate borrowing commitments total $1.25 billion, composed of $1.0 billion of revolving commitments and a term loan in the aggregate principal amount of $250 million (the “Term Loan”). The Credit Facility provides the ability to borrow in either Mexican pesos or Canadian dollars, up to an aggregate equivalent amount of $200 million. Revolving commitments under the Credit Facility mature on October 29, 2018, and the Term Loan matures on November 21, 2019. The Term Loan is subject to amortization in quarterly principal installments of $3.1 million, subject to reduction as a result of the application of certain prepayments in accordance with the terms of the Credit Facility, commencing as of the quarter ending March 31, 2016 and continuing for each fiscal quarter thereafter. The maximum amount available for letters of credit under the Credit Facility is $450 million, of which up to $100 million can be denominated in either Mexican pesos or Canadian dollars. The Credit Facility also provides for swing line loans of up to $75 million. Under the Credit Facility, the Company has the option to increase revolving commitments and/or establish additional term loan tranches in an aggregate amount of $250 million. Borrowings under the Credit Facility are used for working capital requirements, capital expenditures and other corporate purposes, including equity, joint venture and other investments, the repurchase or prepayment of indebtedness and share repurchases under authorized share repurchase programs. Deferred financing costs associated with the Credit Facility, including the Term Loan, totaled $7.0 million and $6.9 million, net of accumulated amortization as of September 30, 2015 and December 31, 2014, respectively.

As of September 30, 2015 and December 31, 2014, outstanding revolving loans under the Credit Facility accrued interest at weighted average rates of approximately 2.50% and 2.18% per annum, respectively, and the Term Loan accrued interest at a rate of 2.19% and 1.92% as of September 30, 2015 and December 31, 2014, respectively. Letters of credit of approximately $172.4 million and $153.6 million were issued as of September 30, 2015 and December 31, 2014, respectively. As of September 30, 2015 and December 31, 2014, letter of credit fees accrued at 1% and 0.875% per annum, respectively, for performance standby letters of credit and at 2% and 1.75% per annum, respectively, for financial standby letters of credit. Outstanding letters of credit mature at various dates and most have automatic renewal provisions, subject to prior notice of cancellation. As of September 30, 2015 and December 31, 2014, borrowing capacity of $478.3 million and $563.7 million, respectively, was available for revolving loans, or up to $277.6 million and $296.4 million, respectively, for new letters of credit. The unused facility fee was 0.40% and 0.35% as of September 30, 2015 and December 31, 2014, respectively. The Credit Facility is guaranteed by certain subsidiaries of the Company (the “Guarantor Subsidiaries”), and the obligations under the Credit Facility are secured by substantially all of the Company’s and the Guarantor Subsidiaries’ respective assets, subject to certain exceptions.

The Credit Facility is subject to certain provisions and covenants, as more fully described in Note 10 - Debt in the notes to the audited consolidated financial statements included in the 2014 Form 10-K. As of September 30, 2015 and December 31, 2014, MasTec was in compliance with the provisions and covenants of the Credit Facility.

In September 2015, the Company amended the terms of the Credit Facility (the “Amendment”) to provide additional short-term flexibility for potential borrowings. The Amendment provides for a maximum consolidated leverage ratio, as defined in the Credit Facility, of up to (i) 4.25 during the period commencing on September 30, 2015 and ending on September 29, 2016, (ii) 4.00 during the period commencing on September 30, 2016 and ending on December 30, 2016, and (iii) 3.50 thereafter. The Amendment also revised the calculation of Consolidated EBITDA, as defined, as of September 30, 2015 and December 31, 2015 to permit the Company to add back certain cash charges in addition to those previously prescribed. The Company paid consent fees of $1.3 million in connection with the Amendment, which were recorded within deferred financing costs in the third quarter of 2015.

Other Credit Facilities. The Company has other credit facilities that support the working capital requirements of its foreign operations. Borrowings under these credit facilities, which have varying dates of maturity and are generally renewed on an annual basis, are primarily denominated in Canadian dollars. Maximum borrowing capacity totaled Canadian $40.0 million and $45.0 million as of September 30, 2015 and December 31, 2014, respectively, or approximately $30.0 million and $38.7 million, respectively. Outstanding borrowings totaled approximately $9.5 million and $1.2 million as of September 30, 2015 and December 31, 2014, respectively. Outstanding borrowings accrued interest at a weighted average rate of 3.8% and 4.0% as of September 30, 2015 and December 31, 2014, respectively. Outstanding borrowings that are not renewed are repaid with borrowings under the Credit Facility. Accordingly, the carrying amounts of the Company’s borrowings under its other credit facilities are classified within long-term debt in the Company’s consolidated balance sheets. The Company’s other credit facilities are subject to customary provisions and covenants.

4.875% Senior Notes

The Company has $400 million outstanding principal amount of 4.875% Senior Notes, which are subject to certain provisions and covenants, as more fully described in Note 10 - Debt in the notes to the audited consolidated financial statements included in the 2014 Form 10-K, including a requirement to file with the Securities and Exchange Commission (the “SEC”) annual and quarterly reports. In connection with the delayed filing of the Company’s 2014 Form 10-K and its First Quarter 2015 Form 10-Q, the Company received a consent from the holders of the 4.875% Senior Notes (the “Note Holders”) that extended these reporting requirements to August 1, 2015, subject to a 60-day cure period. With the filing of its First Quarter 2015 Form 10-Q, the Company met the reporting requirements with respect to its 4.875% Senior Notes. The Company paid a 25 basis point fee, or $0.9 million, to its Note Holders, and a 20 basis point fee, or $0.8 million, to its solicitation agent in connection with this consent in 2015. The Note Holders’ fee and solicitation agent’s fee were recorded within deferred financing costs and interest expense, respectively.

Debt Guarantees and Covenants

The 4.875% Senior Notes are senior unsecured unsubordinated obligations and rank equal in right of payment with existing and future unsubordinated debt, and rank senior in right of payment to existing and future subordinated debt and are fully and unconditionally guaranteed on an unsecured, unsubordinated, joint and several basis by certain of the Company’s existing and future 100%-owned direct and indirect domestic subsidiaries that are each guarantors of the Credit Facility or other outstanding indebtedness. See Note 17 - Supplemental Guarantor Condensed Unaudited Consolidating Financial Information.

MasTec was in compliance with the provisions and covenants contained in its outstanding debt instruments as of September 30, 2015 and December 31, 2014.

Additional Information

For detailed discussion and additional information pertaining to the Company’s debt instruments, see Note 10 - Debt in the notes to the Company’s audited consolidated financial statements included in its 2014 Form 10-K.

Interest Expense, Net

The following table provides details of interest expense, net, for the periods indicated (in millions):

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2015			2014			2015			2014
Interest expense:
Contractual and other interest expense (a)	$	11.3		$	11.3		$	34.3		$	31.6
Accretion of senior convertible note discount	—			0.6			—			3.4
Amortization of deferred financing costs	0.7			0.8			2.0			2.7
Total interest expense	$	12.0		$	12.7		$	36.3		$	37.7
Interest income	(0.0		)	(0.1		)	(0.5		)	(0.1		)
Interest expense, net	$	12.0		$	12.6		$	35.8		$	37.6

(a) Contractual and other interest expense for the nine month period ended September 30, 2015 includes $0.8 million of consent solicitation agent fees that were incurred in the second quarter of 2015 related to the delay in filing of the Company’s 2014 Form 10-K and its First Quarter 2015 Form 10-Q, as well as $1.1 million of discount fees related to financing arrangements.

As of September 30, 2015 and December 31, 2014, accrued interest payable, which is recorded within other accrued expenses in the consolidated balance sheets, totaled $2.7 million and $7.4 million, respectively.

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Stock-Based Compensation and Other Employee Benefit Plans

9 Months Ended

Sep. 30, 2015

Share-based Compensation [Abstract]

Stock-Based Compensation and Other Employee Benefit Plans

Note 10 – Stock-Based Compensation and Other Employee Benefit Plans

The Company has stock-based compensation plans, under which stock options, restricted stock awards and restricted stock units are reserved for issuance. Under all stock-based compensation plans in effect as of September 30, 2015, there were approximately 5,378,000 shares available for future grant.

Restricted Shares

MasTec grants restricted stock awards and restricted stock units (together “restricted shares”), which are valued based on the closing share price of MasTec common stock on the date of grant. During the restriction period, holders of restricted stock awards are entitled to vote the shares. Total unearned compensation related to restrictedshares as ofSeptember 30, 2015was approximately$16.8 million, which is expected to be recognized over a weighted average period of approximately1.6years. The intrinsic value, or fair value, of restricted shares that vested, which is based on the market price on the date of vesting, totaled $0.2 million and $1.1 million for the three month periods ended September 30, 2015 and 2014, respectively, and totaled $3.7 million and $7.1 million for the nine month periods ended September 30, 2015 and 2014, respectively.

Activity, restricted shares:	Restricted Shares		Per Share Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2014	1,414,645		$	25.32
Granted	87,690		18.40
Vested	(199,235	)	18.22
Canceled/forfeited	(17,774	)	28.42
Non-vested restricted shares, as of September 30, 2015	1,285,326		$	25.90

Stock Options

The Company has granted options to purchase its common stock to employees and members of the Board of Directors and affiliates under various stock option plans at not less than the fair market value of the underlying stock on the date of grant. All outstanding stock options are fully vested.

Activity, stock options:	StockOptions		Per Share Weighted AverageExercise Price		Weighted Average Remaining Contractual Life(in years)	Aggregate Intrinsic Value (a) (in millions)
Options outstanding and exercisable as of December 31, 2014	284,671		$	12.06	1.29	$	3.0
Exercised	(71,971	)	9.00
Options outstanding and exercisable as of September 30, 2015	212,700		$	13.10	0.79	$	0.6

(a) Amount represents the difference between the exercise price and the closing share price of the Company’s stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options.

The intrinsic value of options exercised, which is based on the difference between the exercise price and the closing market share price of the Company’s common stock on the date of exercise, totaled $0.7 million and $6.5 million for the nine month periods ended September 30, 2015 and 2014, respectively. Proceeds from options exercised during the nine month periods ended September 30, 2015 and 2014 totaled $0.4 million and $0.8 million, respectively.

Employee Stock Purchase Plans

The Company has certain employee stock purchase plans (collectively “ESPPs”) under which shares of the Company's common stock are available for purchase by eligible employees. The following table provides details pertaining to the Company’s ESPPs for the periods indicated:

	For the Nine Months Ended September 30,
	2015		2014
Cash proceeds (in millions)	$	1.3	$	2.5
Common shares issued	86,687		94,761
Weighted average price per share	$	15.33	$	26.60
Weighted average per share grant date fair value	$	4.20	$	6.34

Due to the delay in filing of the Company’s 2014 Form 10-K, contributions to the ESPPs were temporarily suspended in the second quarter of 2015. Contributions resumed in the third quarter of 2015.

Non-CashStock-Based Compensation Expense

Details of non-cash stock-based compensation expense and related tax benefits for the periods indicated were as follows (in millions):

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2015		2014		2015		2014
Non-cash stock-based compensation expense	$	3.2	$	4.1	$	9.5	$	11.6
Income Tax Effects:
Income tax benefit from non-cash stock-based compensation	$	1.2	$	1.8	$	3.7	$	8.4
Excess tax benefit from non-cash stock-based compensation (a)	$	0.0	$	0.1	$	0.1	$	3.5

(a) Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with exercised stock options and vested restricted shares, are classified as financing cash flows in the Company’s condensed unaudited consolidated statements of cash flows.

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Debt (4.875% Senior Notes) (Narrative) (Details) - 4.875% Senior Notes [Member] - Senior Notes [Member] - USD ($)	3 Months Ended
	Jun. 30, 2015	Sep. 30, 2015
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount (in dollars)		$ 400,000,000
Debt instrument, interest rate (percentage)		4.875%
Debt instrument, cure period (in days)	60 days
Debt instrument, consent fee, percentage of principal amount, note holders	0.25%
Debt instrument, payments for consent fee, note holders (in dollars)	$ 900,000
Debt instrument, consent fee, percentage of principal amount, solicitation agent	0.20%
Interest Expense [Member]
Debt Instrument [Line Items]
Debt instrument, payments for consent fee, solicitation agent (in dollars)	$ 800,000

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Segments and Related Information (Schedule of Financial Information by Reportable Segment - Revenue) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue:
Revenue (in dollars)		$ 1,111,010	$ 1,315,488	$ 3,180,906	$ 3,380,538
Communications [Member] | Customer Concentration Risk [Member] | Revenue [Member] | Utilities [Member]
Revenue:
Utilities customers, percentage of Communications segment revenue		11.20%	7.60%	10.50%	7.00%
Reportable Segments [Member] | Communications [Member]
Revenue:
Revenue (in dollars)	[1]	$ 513,300	$ 505,200	$ 1,452,100	$ 1,480,400
Reportable Segments [Member] | Oil and Gas [Member]
Revenue:
Revenue (in dollars)		406,900	554,400	1,144,200	1,299,300
Reportable Segments [Member] | Electrical Transmission [Member]
Revenue:
Revenue (in dollars)		75,900	138,400	270,200	329,100
Reportable Segments [Member] | Power Generation and Industrial [Member]
Revenue:
Revenue (in dollars)		115,000	114,300	302,300	263,100
Reportable Segments [Member] | Other [Member]
Revenue:
Revenue (in dollars)		3,800	4,100	17,200	10,600
Eliminations [Member]
Revenue:
Revenue (in dollars)		$ (3,900)	$ (900)	$ (5,100)	$ (2,000)

[1] Revenue generated by utilities customers represented 11.2% and 7.6% of Communications segment revenue for the three month periods ended September 30, 2015 and 2014, respectively, and represented 10.5% and 7.0% for the nine month periods ended September 30, 2015 and 2014, respectively.

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Debt (Schedule of Interest Expense, Net) (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest expense:
Contractual and other interest expense	[1]	$ 11,300		$ 11,300	$ 34,300	$ 31,600
Accretion of senior convertible note discount		0		600	0	3,400
Amortization of deferred financing costs		700		800	2,000	2,700
Total interest expense		12,000		12,700	36,300	37,700
Interest income		0		(100)	(500)	(100)
Interest expense, net		$ 11,964		$ 12,643	35,845	$ 37,595
Interest Expense [Member] | Financing Receivable [Member]
Interest expense:
Non-recourse financing arrangement, discount charge					$ 1,100
Interest Expense [Member] | Senior Notes [Member] | 4.875% Senior Notes [Member]
Interest expense:
Debt instrument, payments for consent fee, solicitation agent			$ 800

[1] Contractual and other interest expense for the nine month period ended September 30, 2015 includes $0.8 million of consent solicitation agent fees that were incurred in the second quarter of 2015 related to the delay in filing of the Company’s 2014 Form 10-K and its First Quarter 2015 Form 10-Q, as well as $1.1 million of discount fees related to financing arrangements.

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Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	$ 260,602	$ 81,019
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	(148)	(162,901)
Capital expenditures	(70,766)	(90,962)
Proceeds from sale of property and equipment	9,763	12,204
Payments for investments, net	(109,299)	(1,046)
Net cash used in investing activities	(170,450)	(242,705)
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	1,329,610	1,319,623
Repayments of credit facilities	(1,240,122)	(955,151)
Repayments of senior convertible notes	0	(105,325)
Repayments of other borrowings and capital lease obligations	(51,300)	(54,100)
Repurchase of common stock	(100,000)	0
Proceeds from stock-based awards, net of tax withholdings	1,743	318
Excess tax benefit from stock-based compensation	56	3,494
Payments of acquisition-related contingent consideration	(44,757)	(60,341)
Payments of financing costs	(2,435)	(1,455)
Net financing activities and advances from (to) consolidated affiliates	0	0
Net cash (used in) provided by financing activities	(107,160)	146,978
Effect of currency translation on cash	103	(1,152)
Net decrease in cash and cash equivalents	(16,905)	(15,860)
Cash and cash equivalents - beginning of period	24,059	22,927
Cash and cash equivalents - end of period	7,154	7,067
Reportable Legal Entities [Member] | MasTec, Inc. [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	(1,100)	(900)
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	0	0
Capital expenditures	0	0
Proceeds from sale of property and equipment	0	0
Payments for investments, net	0	0
Net cash used in investing activities	0	0
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	0	0
Repayments of credit facilities	0	0
Repayments of senior convertible notes		0
Repayments of other borrowings and capital lease obligations	0	0
Repurchase of common stock	(100,000)
Proceeds from stock-based awards, net of tax withholdings	2,100	2,900
Excess tax benefit from stock-based compensation	0	0
Payments of acquisition-related contingent consideration	0	0
Payments of financing costs	0	0
Net financing activities and advances from (to) consolidated affiliates	99,000	(2,000)
Net cash (used in) provided by financing activities	1,100	900
Effect of currency translation on cash	0	0
Net decrease in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	317,000	41,100
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	(100)	(40,000)
Capital expenditures	(58,200)	(75,600)
Proceeds from sale of property and equipment	8,400	10,300
Payments for investments, net	(109,300)	(1,000)
Net cash used in investing activities	(159,200)	(106,300)
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	827,100	1,122,400
Repayments of credit facilities	(747,800)	(723,200)
Repayments of senior convertible notes		(105,300)
Repayments of other borrowings and capital lease obligations	(36,400)	(45,400)
Repurchase of common stock	0
Proceeds from stock-based awards, net of tax withholdings	(400)	(2,600)
Excess tax benefit from stock-based compensation	100	3,500
Payments of acquisition-related contingent consideration	(37,300)	(60,300)
Payments of financing costs	(2,400)	(1,500)
Net financing activities and advances from (to) consolidated affiliates	(169,200)	(125,200)
Net cash (used in) provided by financing activities	(166,300)	62,400
Effect of currency translation on cash	0	0
Net decrease in cash and cash equivalents	(8,500)	(2,800)
Cash and cash equivalents - beginning of period	18,500	5,400
Cash and cash equivalents - end of period	10,000	2,600
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	(55,300)	40,800
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	0	(122,900)
Capital expenditures	(12,600)	(15,400)
Proceeds from sale of property and equipment	1,400	1,900
Payments for investments, net	0	0
Net cash used in investing activities	(11,200)	(136,400)
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	502,500	197,200
Repayments of credit facilities	(492,300)	(232,000)
Repayments of senior convertible notes		0
Repayments of other borrowings and capital lease obligations	(14,900)	(8,700)
Repurchase of common stock	0
Proceeds from stock-based awards, net of tax withholdings	0	0
Excess tax benefit from stock-based compensation	0	0
Payments of acquisition-related contingent consideration	(7,500)	0
Payments of financing costs	0	0
Net financing activities and advances from (to) consolidated affiliates	70,200	127,200
Net cash (used in) provided by financing activities	58,000	83,700
Effect of currency translation on cash	100	(1,200)
Net decrease in cash and cash equivalents	(8,400)	(13,100)
Cash and cash equivalents - beginning of period	5,600	17,600
Cash and cash equivalents - end of period	(2,800)	4,500
Eliminations [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	0	0
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	0	0
Capital expenditures	0	0
Proceeds from sale of property and equipment	0	0
Payments for investments, net	0	0
Net cash used in investing activities	0	0
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	0	0
Repayments of credit facilities	0	0
Repayments of senior convertible notes		0
Repayments of other borrowings and capital lease obligations	0	0
Repurchase of common stock	0
Proceeds from stock-based awards, net of tax withholdings	0	0
Excess tax benefit from stock-based compensation	0	0
Payments of acquisition-related contingent consideration	0	0
Payments of financing costs	0	0
Net financing activities and advances from (to) consolidated affiliates	0	0
Net cash (used in) provided by financing activities	0	0
Effect of currency translation on cash	0	0
Net decrease in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	$ 0	$ 0

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Debt (Other Credit Facilities) (Narrative) (Details) - Other Credit Facilities [Member] CAD in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2015 CAD	Sep. 30, 2015 USD ($)	Dec. 31, 2014 CAD	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity (in dollars) | CAD	CAD 40.0		CAD 45.0
Line of credit facility, amount outstanding (in dollars)		$ 9.5		$ 1.2
Line of credit facility, rationale for classification as long-term debt	Outstanding borrowings that are not renewed are repaid with borrowings under the Credit Facility. Accordingly, the carrying amounts of the Company’s borrowings under its other credit facilities are classified within long-term debt in the Company’s consolidated balance sheets.
Weighted Average [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	3.80%	3.80%	4.00%	4.00%
Canadian Dollars [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity (in dollars)		$ 30.0		$ 38.7
Line of credit facility, amount outstanding (in dollars)		$ 9.5		$ 1.2

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Commitments and Contingencies (Other Commitments and Contingencies) (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member]
Commitments and Contingencies [Line Items]
Self insurance reserve	$ 74.0	$ 70.3
Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member] | Other Long-Term Liabilities [Member]
Commitments and Contingencies [Line Items]
Self insurance reserve, non-current	43.9	39.6
Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member] | Other Long-Term Assets [Member]
Commitments and Contingencies [Line Items]
Cash collateral held by insurance carriers	1.3	1.2
Uninsured Risk [Member] | Employee Group Medical Claims Policies [Member]
Commitments and Contingencies [Line Items]
Self insurance reserve	3.2	4.4
Performance and Payment Bonds [Member]
Commitments and Contingencies [Line Items]
Outstanding bonds, amount	553.7	748.3
Performance and Payment Bonds [Member] | Estimate [Member]
Commitments and Contingencies [Line Items]
Bonded projects, costs to complete	44.1	60.1
Surety Bond [Member] | Uninsured Risk [Member] | Workers Compensation [Member]
Commitments and Contingencies [Line Items]
Outstanding bonds, amount	13.0	13.0
Credit Facility [Member]
Commitments and Contingencies [Line Items]
Letters of credit issued	172.4	153.6
Credit Facility [Member] | Financial Guarantees [Member] | Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member]
Commitments and Contingencies [Line Items]
Letters of credit issued	$ 74.2	$ 75.0

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Segments and Related Information (Tables)

9 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Schedule of Financial Information by Reportable Segment

Summarized financial information for MasTec’s reportable segments is presented and reconciled to consolidated financial information for total MasTec in the following tables (in millions):

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2015			2014			2015			2014
Revenue:				As Restated						As Restated
Communications (a)	$	513.3		$	505.2		$	1,452.1		$	1,480.4
Oil and Gas	406.9			554.4			1,144.2			1,299.3
Electrical Transmission	75.9			138.4			270.2			329.1
Power Generation and Industrial	115.0			114.3			302.3			263.1
Other	3.8			4.1			17.2			10.6
Eliminations	(3.9		)	(0.9		)	(5.1		)	(2.0		)
Consolidated revenue	$	1,111.0		$	1,315.5		$	3,180.9		$	3,380.5

(a) Revenue generated by utilities customers represented 11.2% and 7.6% of Communications segment revenue for the three month periods ended September 30, 2015 and 2014, respectively, and represented 10.5% and 7.0% for the nine month periods ended September 30, 2015 and 2014, respectively.

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2015			2014			2015			2014
EBITDA - Continuing Operations:				As Restated						As Restated
Communications	$	49.7		$	52.5		$	141.8		$	153.7
Oil and Gas	51.0			73.4			113.9			144.2
Electrical Transmission	(23.7		)	18.5			(47.6		)	35.1
Power Generation and Industrial	4.8			4.9			3.9			9.4
Other	(2.0		)	(0.7		)	(7.1		)	(0.1		)
Corporate	(12.0		)	(14.4		)	(40.5		)	(38.7		)
Consolidated EBITDA - Continuing operations	$	67.8		$	134.2		$	164.4		$	303.6

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
Depreciation and Amortization:	2015		2014		2015		2014
Communications	$	13.2	$	10.1	$	37.6	$	30.1
Oil and Gas	20.0		23.3		64.3		61.3
Electrical Transmission	5.5		5.2		16.0		11.9
Power Generation and Industrial	1.7		1.7		5.0		4.8
Other	0.0		0.0		0.1		0.0
Corporate	1.8		1.4		5.0		3.9
Consolidated depreciation and amortization	$	42.2	$	41.7	$	128.0	$	112.0

Reconciliation of EBITDA to Consolidated (Loss) Income from Continuing Operations before Income Taxes

The following table presents a reconciliation of EBITDA to consolidated income from continuing operations before income taxes (in millions):

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2015			2014			2015			2014
EBITDA Reconciliation:				As Restated						As Restated
EBITDA - Continuing operations	$	67.8		$	134.2		$	164.4		$	303.6
Less:
Interest expense, net	(12.0		)	(12.6		)	(35.8		)	(37.6		)
Depreciation and amortization	(42.2		)	(41.7		)	(128.0		)	(112.0		)
Income from continuing operations before income taxes	$	13.6		$	79.8		$	0.5		$	154.0

Schedule of Significant Customers, Revenue Concentration Information

Revenue concentration information for significant customers as a percentage of total consolidated revenue was as follows:

	For the Three Months Ended September 30,		For the Nine Months Ended September 30,
	2015	2014	2015	2014
Customer:		As Restated		As Restated
AT&T (including DIRECTV®) (a)(b)	31%	28%	31%	33%
Enbridge, Inc. (c)	0%	10%	1%	10%

(a) The Company’s relationship with AT&T is based upon multiple separate master service agreements, other service agreements and construction/installation contracts for AT&T’s (i) wireless, (ii) wireline/fiber, (iii) home security and automation businesses, and (iv) for DIRECTV® services, is based upon an agreement to provide installation and maintenance services. Revenue from AT&T is included in the Communications segment.

(b) DIRECTV® was acquired by AT&T in July 2015. Revenue from DIRECTV® is presented on a combined basis with AT&T for all periods.

(c) The Company’s relationship with Enbridge, Inc. is based upon various construction contracts for natural gas pipelines. Revenue from Enbridge, Inc. is included in the Oil and Gas segment.

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Goodwill and Other Intangible Assets (Schedule of Goodwill by Segment) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill, balance as of September 30, 2015	$ 1,064,822	$ 1,082,466
Communications [Member]
Goodwill [Line Items]
Goodwill, balance as of September 30, 2015	418,500
Oil and Gas [Member]
Goodwill [Line Items]
Goodwill, balance as of September 30, 2015	378,800
Electrical Transmission [Member]
Goodwill [Line Items]
Goodwill, balance as of September 30, 2015	149,900
Power Generation and Industrial [Member]
Goodwill [Line Items]
Goodwill, balance as of September 30, 2015	$ 117,600

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 15 - Commitments and Contingencies

In addition to the matters discussed below, MasTec is subject to a variety of legal cases, claims and other disputes that arise from time to time in the ordinary course of its business. MasTec cannot provide assurance that it will be successful in recovering all or any of the potential damages it has claimed or in defending claims against it. The outcome of such cases, claims and disputes, including those set forth below, cannot be predicted with certainty and an unfavorable resolution of one or more of them could have a material adverse effect on the Company’s business, financial condition, results of operations and cash flows.

PPL. In October 2012, PPL Electric Utilities Corporation (“PPL”) and T&D Power, Inc., a MasTec, Inc. subsidiary (“T&D”), entered into a $206 million overhead transmission line construction contract (the “Contract”), pursuant to which T&D agreed to construct an approximately 100 mile transmission line in Pennsylvania. In September 2013, PPL issued a notice terminating the Contract for convenience. T&D then submitted termination invoices to recover certain pre-termination costs, overhead and profit, as well as termination-related demobilization costs, along with the applicable overhead and profit. PPL disputes these invoices. As a result of the dispute, T&D sued PPL in December 2013 in federal court in the Eastern District of Pennsylvania, and pursued claims in excess of $40 million for breach of contract, including PPL’s breach of its implied duty of good faith and fair dealing. After the parties completed discovery, in July 2015, PPL filed a motion for partial summary judgment, which was subsequently denied by the federal court. On October 5, 2015, trial proceedings commenced and during this process, the federal court required the parties to mediate, resulting in a settlement agreement in which the Company was awarded monies to be received in the fourth quarter of 2015. This settlement resulted in a charge of $12.2 million, related to the reduction of receivables associated with this contract. This charge was recorded within other expense of the Electrical Transmission segment in the third quarter of 2015.

SunLight Entities.In 2011, Power Partners MasTec, LLC., a MasTec, Inc. subsidiary (“Power Partners”), entered into engineering, procurement, and construction agreements (the “EPC Agreements”) with special purpose entities, SunLight General Somerset Solar, LLC, SunLight General Morris Solar, LLC and SunLight General Sussex Solar, LLC (collectively, the “SunLight Entities”), respectively, to perform design and construction services for three public solar projects in New Jersey located in Somerset, Morris and Sussex Counties (the “Projects”). Power Partners and the SunLight Entities engaged in three separate arbitration proceedings against each other to address various disputes that existed between the parties regarding the Projects. In August 2014, the arbitration panel rendered awards in Power Partners’ favor in the aggregate amount of approximately $68 million, including fees and expenses. Power Partners also filed a lawsuit in June 2013 in federal court in New Jersey against the Somerset and Morris Authorities (the “Authorities”) and the principals of the SunLight Entities with claims exceeding $60 million as part of its efforts to seek payment of amounts that were also the subject of the arbitration proceedings.

In March 2015, the Authorities, the SunLight Entities and principals and Power Partners entered into separate settlement agreements. As part of the settlement, Power Partners received amounts that were substantially equal to the previously recorded amounts, and all of the parties executed mutual releases.

Wrigley v. MasTec, Inc. On May 7, 2015, a putative class action lawsuit (the “Lawsuit”), Wrigley v. MasTec, Inc., et. al. (Case No. 1:15-cv-21740) was filed in the United States District Court, Southern District of Florida, naming the Company, the Company’s Chief Executive Officer, José R. Mas, and the Company’s Chief Financial Officer, George L. Pita, as defendants. On August 5, 2015, co-lead plaintiffs were appointed, and an amended complaint was filed on October 13, 2015. The Lawsuit has been purportedly brought by a shareholder, both individually and on behalf of a putative class of shareholders, alleging violations of the federal securities laws arising from alleged false or misleading statements contained in, or alleged material omissions from, certain of the Company’s filings with the SEC and other statements, in each case with respect to accounting matters that are the subject of the Audit Committee’s independent internal investigation. The amended complaint seeks damages stemming from losses Plaintiffs claim to have suffered as a result of purchasing Company securities at an allegedly inflated market price. The Company believes that the Lawsuit is without merit and intends to vigorously defend against it; however, there can be no assurance that the Company will be successful in its defense.

Other Commitments and Contingencies

Regulatory Matters. The Company has self-reported to the staff of the SEC (“the Staff”) regarding the previously disclosed Audit Committee’s independent investigation and is cooperating with the Staff’s requests for additional information regarding the investigation. The Company intends to continue full cooperation with the SEC.

Leases. In the ordinary course of business, the Company enters into non-cancelable operating leases for certain of its facility, vehicle and equipment needs, including related party leases. See Note 9 - Lease Obligations.

Letters of Credit. In the ordinary course of business, the Company is required to post letters of credit for its insurance carriers, surety bond providers and in support of performance under certain contracts. Such letters of credit are generally issued by a bank or similar financial institution. The letter of credit commits the issuer to pay specified amounts to the holder of the letter of credit under certain conditions. If this were to occur, the Company would be required to reimburse the issuer of the letter of credit, which, depending upon the circumstances, could result in a charge to earnings. As of September 30, 2015 and December 31, 2014, there were $172.4 million and $153.6 million, respectively, of letters of credit issued under the Company’s Credit Facility. The Company is not aware of material claims relating to outstanding letters of credit as of September 30, 2015 or December 31, 2014.

Performance and Payment Bonds. In the ordinary course of business, MasTec is required by certain customers to provide performance and payment bonds for some of the Company’s contractual commitments related to projects in process. These bonds provide a guarantee to the customer that the Company will perform under the terms of a contract and that the Company will pay subcontractors and vendors. If the Company fails to perform under a contract or to pay subcontractors and vendors, the customer may demand that the surety make payments or provide services under the bond. The Company must reimburse the surety for expenses or outlays it incurs. As of September 30, 2015, the estimated cost to complete projects secured by the Company’s $553.7 million in performance and payment bonds was $44.1 million. As of December 31, 2014, the estimated cost to complete projects secured by the Company’s $748.3 million in performance and payment bonds was $60.1 million. These amounts do not include performance and payment bonds associated with the Company’s equity method investments and contractual joint venture, which are separately disclosed in Note 3 - Acquisitions.

Investments in Affiliates and Other Entities. The Company holds an undivided interest in a contractual joint venture, which is not controlled by the Company and is managed by a third party, for the purpose of providing infrastructure construction services under a civil construction project. The contractual joint venture automatically terminates upon completion of the project. Losses incurred by the joint venture are generally shared proportionally by the joint venture members, with members of the joint venture jointly and severally liable for all of the obligations of the joint venture. The joint venture agreement provides that each joint venture partner indemnify the other party for any liabilities incurred by such joint venture in excess of its ratable portion of such liabilities. Thus, it is possible that the Company could be required to pay or perform obligations in excess of its share if the other joint venture partner fails or refuses to pay or perform its share of the obligations. As of September 30, 2015, the Company was not aware of circumstances that would reasonably lead to future claims against it for material amounts. From time to time, the Company may provide financing to its unconsolidated affiliates, including its equity method investees and/or contractual joint venture. See Note 3 - Acquisitions and Note 5 - Fair Value of Financial Instruments for discussion pertaining to certain of the Company’s cost and equity method investees and other investment arrangements, including funding provided and amounts committed.

Self-Insurance. MasTec maintains insurance policies for workers’ compensation, general liability and automobile liability, which are subject to per claim deductibles. The Company also maintains excess umbrella coverage. As of September 30, 2015 and December 31, 2014, MasTec’s liability for unpaid claims and associated expenses, including incurred but not reported losses related to these policies, totaled $74.0 million and $70.3 million, respectively, of which $43.9 million and $39.6 million, respectively, were reflected within other long-term liabilities in the consolidated balance sheets. MasTec also maintains an insurance policy with respect to employee group medical claims, which is subject to annual per employee maximum losses. MasTec’s liability for employee group medical claims as of September 30, 2015 and December 31, 2014 totaled $3.2 million and $4.4 million, respectively.

The Company is required to post letters of credit and provide cash collateral to certain of its insurance carriers and to provide surety bonds in certain states. Insurance-related letters of credit for the Company’s workers’ compensation, general liability and automobile liability policies amounted to $74.2 million and $75.0 million as of September 30, 2015 and December 31, 2014, respectively. In addition, cash collateral deposited with insurance carriers, which is included within other long-term assets in the consolidated balance sheets, amounted to $1.3 million and $1.2 million for these policies as of September 30, 2015 and December 31, 2014, respectively. Outstanding surety bonds related to workers’ compensation self-insurance programs amounted to $13.0 million as of both September 30, 2015 and December 31, 2014.

Employment Agreements. The Company has employment agreements with certain executives and other employees, which provide for compensation and certain other benefits and for severance payments under certain circumstances. Certain employment agreements also contain clauses that become effective upon a change in control of the Company. Upon the occurrence of any of the defined events in the various employment agreements, the Company would be obligated to pay certain amounts to the relevant employees, which vary with the level of the employees’ respective responsibility.

Collective Bargaining Agreements and Multi-Employer Plans.Certain of MasTec’s subsidiaries are party to various collective bargaining agreements with unions representing certain of their employees. These agreements require the subsidiaries party to the agreements to pay specified wages, provide certain benefits to their union employees and contribute certain amounts to multi-employer pension plans and employee benefit trusts. The collective bargaining agreements expire at various times and have typically been renegotiated and renewed on terms similar to the ones contained in the expiring agreements.

The Employee Retirement Income Security Act of 1974, as amended by the Multi-Employer Pension Plan Amendments Act of 1980 (collectively, “ERISA”), which governs U.S.-registered multi-employer pension plans, subjects employers to substantial liabilities in the event of the employer’s complete or partial withdrawal from, or upon termination of, such plans. Under current law pertaining to employers who are contributors to U.S.-registered multi-employer defined benefit plans, a plan’s termination, an employer’s voluntary withdrawal from, or the mass withdrawal of contributing employers from, an underfunded multi-employer defined benefit plan requires participating employers to make payments to the plan for their proportionate share of the multi-employer plan’s unfunded vested liabilities. These liabilities include an allocable share of the unfunded vested benefits of the plan for all plan participants, not only for benefits payable to participants of the contributing employer. As a result, participating employers may bear a higher proportion of liability for unfunded vested benefits if the other participating employers cease to contribute to, or withdraw from, the plan. The allocable portion of liability to participating employers could be more disproportionate if employers that have withdrawn from the plan are insolvent, or if they otherwise fail to pay their proportionate share of the withdrawal liability. The Company currently contributes, and in the past has contributed to, plans that are underfunded, and, therefore, could have potential liability associated with a voluntary or involuntary withdrawal from, or termination of, these plans. While the Company does not currently have plans to withdraw from, and is not aware of related liabilities associated with these plans, there can be no assurance that the Company will not be assessed liabilities in the future. The Pension Protection Act of 2006 (“PPA”) added funding rules to U.S.-registered plans classified as “endangered,” “seriously endangered,” or “critical” status. The PPA requires that underfunded pension plans improve their funding ratios within prescribed intervals based on their level of underfunding. If a plan is in critical status, benefit reductions may apply and/or participating employers could be required to make additional contributions. In addition, if a multi-employer defined benefit plan fails to satisfy certain minimum funding requirements, the Internal Revenue Service (“IRS”) may impose on the employers contributing to such plan a non-deductible excise tax of 5% of the amount of the accumulated funding deficiency.

Based upon the information available to the Company from plan administrators as of September 30, 2015, several of the multi-employer pension plans in which it participates are underfunded and, as a result, the Company could be required to increase its contributions. Some of the Company’s subsidiaries have also been notified that certain plans to which they contribute are in “critical” status and require additional contributions in the form of a surcharge on future benefit contributions required for future work performed by union employees covered by these plans. The amount of additional funds the Company may be obligated to contribute in the future cannot be estimated, as these amounts are based on future levels of work of the union employees covered by the plans.

In November 2014, the Company, along with other members of the Pipe Line Contractors Association (“PLCA”), voluntarily terminated its participation in several defined benefit multi-employer pension plans. No withdrawal liability was assessed as of the date of the Company’s termination of participation in these plans. There can be no assurance, however, that these plans, which were in critical status as of the date the Company terminated its participation, will not assess penalties in the future. Additionally, in November 2011, the Company, along with other members of the PLCA, voluntarily withdrew from the Central States Southeast and Southwest Areas Pension Fund (“Central States”), a defined benefit multi-employer pension plan that is in critical status. In connection with this withdrawal, a $6.4 million withdrawal liability was established based on an estimate provided by the Central States administrator as of the date of withdrawal. The Company began paying installments towards this withdrawal liability in 2013, of which $3.3 million and $4.2 million was outstanding as of September 30, 2015 and December 31, 2014, respectively. The Company withdrew from Central States in order to mitigate its liability in connection with the plan; however, Central States has asserted that the PLCA members did not effectively withdraw in 2011 and are, therefore, responsible for a withdrawal liability that includes 2011 contribution amounts. By letter dated March 14, 2013, Central States demanded $11 million in withdrawal liability from the Company, which included 2011 contribution amounts. The Company is vigorously opposing this demand because it believes that it legally and effectively withdrew from Central States in November 2011. If Central States were to prevail in its assertion that the Company withdrew after that date, then the initial amount of the Company’s withdrawal liability would increase to approximately $11 million. This dispute over the proper withdrawal date was litigated in federal court. In September 2015, the withdrawal date dispute was resolved in the PLCA’s favor by the U.S. Court of Appeals for the Seventh Circuit in a decision finding that the PLCA members lawfully and effectively withdrew from Central States by and through their actions in 2011. If Central States or other plans from which the Company has withdrawn were to undergo a mass withdrawal, as defined by ERISA and the Pension Benefit Guaranty Corporation, within the three-year period commencing with the beginning of the calendar year during which the Company effectively withdrew from the plan, there could be additional liability. Given the uncertain nature of the outcome of these factors, the ultimate withdrawal liability can only be estimated.

Indemnities. The Company generally indemnifies its customers for the services it provides under its contracts, as well as other specified liabilities, which may subject the Company to indemnity claims, liabilities and related litigation. As of September 30, 2015 and December 31, 2014, the Company was not aware of material asserted or unasserted claims in connection with these indemnity obligations.

Other Guarantees.In the ordinary course of its business, from time to time, MasTec guarantees the obligations of its subsidiaries, including obligations under certain contracts with customers, certain lease obligations and in some states, obligations in connection with obtaining contractors’ licenses. MasTec has also issued performance and other guarantees in connection with its undivided interest in a contractual joint venture and certain of its equity investees. See Note 3 - Acquisitions and Note 5 - Fair Value of Financial Instruments for discussion of certain of the Company’s equity method investees and other investment arrangements, including related guarantees. MasTec also generally warrants the work it performs for a one to two year period following substantial completion of a project. MasTec has not historically accrued reserves for potential warranty claims as they have been immaterial.

Concentrations of Risk. In the third quarter of 2015, DIRECTV^® was acquired by AT&T. Taking into consideration the July 2015 acquisition of DIRECTV^® by AT&T, the Company had approximately 480 customers for the nine month period ended September 30, 2015. Revenue from DIRECTV® is presented on a combined basis with AT&T for all periods presented. As of September 30, 2015, one customer accounted for approximately 10% of the Company’s consolidated net accounts receivable position, which represents accounts receivable, net, less billings in excess of costs and earnings. As of December 31, 2014, one customer accounted for 19% of the Company’s consolidated net accounts receivable position. In addition, the Company derived 64% and 65% of revenue from its top ten customers for the three month periods ended September 30, 2015 and 2014, respectively, and derived 60% and 68% of revenue, respectively, from its top ten customers for the nine month periods ended September 30, 2015 and 2014.

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Acquisitions (Tables)

9 Months Ended

Sep. 30, 2015

Business Combinations [Line Items]

Schedule of Pro Forma Information, Business Acquisitions

The unaudited supplemental pro forma financial information presented below has been prepared by adjusting the historical results of MasTec to include the historical results of the acquired businesses described above and was then adjusted (i) to remove acquisition costs, including certain acquisition integration costs; (ii) to increase amortization expense resulting from the incremental intangible assets acquired; (iii) to increase interest expense as a result of the cash consideration paid; (iv) to remove integration-related employee redundancy costs; and (v) to reduce interest expense from debt repaid upon acquisition of the respective businesses. The unaudited supplemental pro forma financial information does not include adjustments to reflect the impact of other cost savings or synergies that may result from these acquisitions.

	For the Three Months Ended September 30, 2014		For the Nine Months Ended September 30, 2014
Unaudited pro forma financial information (in millions):
Revenue	$	1,423.5	$	3,854.0
Net income from continuing operations	$	50.6	$	100.2

Results of Businesses Acquired

Revenue and net income (loss) from continuing operations resulting from the year-over-year incremental impact of acquired businesses, which are included within the Company’s condensed unaudited consolidated results of operations for the periods indicated, were as follows (in millions):

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2015		2014		2015			2014
Actual of acquirees(year-over-year impact):			As Restated					As Restated
Revenue	$	69.2	$	133.2	$	301.5		$	342.5
Net income (loss) from continuing operations (a)	$	0.2	$	2.3	$	(13.4	)	$	4.3

(a) Acquiree net income (loss) from continuing operations for the nine month period ended September 30, 2015 includes approximately $9.3 million of pre-tax acquisition integration costs incurred in connection with the WesTower acquisition, and for the three and nine month periods ended September 30, 2015, includes project losses of $2.8 million and $8.3 million, respectively, associated with the Company’s proportionate interest in a non-controlled Canadian joint venture. Other acquisition-related costs, including certain acquisition integration costs totaling $1.9 million and $10.3 million for the three and nine month periods ended September 30, 2015, respectively, and $0.5 million and $2.0 million for the three and nine month periods ended September 30, 2014, respectively, are not included in the above presented acquiree results for the respective periods. The above results also do not include interest expense associated with consideration paid for these acquisitions.

WesTower [Member]

Business Combinations [Line Items]

Schedule of Consideration Paid and Net Assets Acquired, Business Acquisitions

The following table summarizes the preliminary estimated fair values of consideration paid and identifiable assets acquired and liabilities assumed as of the date of acquisition (in millions):

Acquisition consideration:	October 1, 2014
Cash	$	198.0
Identifiable assets acquired and liabilities assumed:
Accounts receivable	$	180.6
Other current assets, including $18.0 million of cash acquired	50.3
Property, equipment and other long-term assets, including deferred tax asset	18.0
Finite-lived intangible assets	42.6
Billings in excess of costs and earnings	(33.3		)
Other current liabilities, including current portion of capital lease obligations	(89.8		)
Long-term liabilities, including capital lease obligations	(21.1		)
Total identifiable net assets	$	147.3
Goodwill	$	50.7
Total net assets acquired, including goodwill	$	198.0

Schedule of Finite-Lived Intangible Assets Acquired, Business Acquisitions

The fair values and weighted average useful lives of WesTower’s acquired finite-lived intangible assets as of the date of acquisition were assigned as follows:

	Fair Value (in millions)		Weighted Average Useful Life (in years)
Finite-lived intangible assets:
Backlog	$	4.7	5
Trade name	1.1		4
Non-compete agreements	0.3		4
Customer relationships	36.5		18
Total acquired finite-lived intangible assets	$	42.6	16

Pacer [Member]

Business Combinations [Line Items]

Schedule of Consideration Paid and Net Assets Acquired, Business Acquisitions

The following table summarizes the estimated fair values of consideration paid and identifiable assets acquired and liabilities assumed, as adjusted, as of the date of acquisition (in millions):

Acquisition consideration:	June 1, 2014
Cash	$	126.5
Fair value of contingent consideration (earn-out liability)	24.3
Total consideration transferred	$	150.8
Identifiable assets acquired and liabilities assumed:
Current assets, including $3.4 million of cash acquired	$	114.0
Property and equipment	81.2
Pre-qualifications	38.7
Finite-lived intangible assets	19.4
Current liabilities, including current portion of capital lease obligations and long-term debt	(71.8		)
Net equity method investment obligations	(31.0		)
Long-term debt, including capital lease obligations	(69.6		)
Deferred income taxes	(30.5		)
Total identifiable net assets	$	50.4
Goodwill	$	100.4
Total net assets acquired, including goodwill	$	150.8

Schedule of Finite-Lived Intangible Assets Acquired, Business Acquisitions

The fair values and weighted average useful lives of Pacer’s acquired finite-lived intangible assets, as adjusted, as of the date of acquisition were assigned as follows:

	Fair Value (in millions)		Weighted Average Useful Life (in years)
Finite-lived intangible assets:
Backlog	$	6.1	3
Non-compete agreements	2.3		9
Customer relationships	11.0		8
Total acquired finite-lived intangible assets	$	19.4	6

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Commitments and Contingencies (Concentrations of Risk) (Narrative) (Details) - customer			3 Months Ended		9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Concentration Risk [Line Items]
Number of customers					480
Credit Concentration Risk [Member] | Customer with Highest Net Accounts Receivable Position Subsequent to AT&T's Acquisition of DIRECTV [Member] | Accounts Receivable, Net, Less Billings in Excess of Costs and Earnings [Member]
Concentration Risk [Line Items]
Concentration risk, percentage of total	10.00%	19.00%
Customer Concentration Risk [Member] | Ten Largest Customers Subsequent to AT&T's Acquisition of DIRECTV [Member] | Revenue [Member]
Concentration Risk [Line Items]
Number of customers			10	10	10	10
Concentration risk, percentage of total			64.00%	65.00%	60.00%	68.00%

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Acquisitions (2014 Acquisitions - Other 2014 Acquisitions) (Narrative) (Details) - USD ($) $ in Millions			9 Months Ended
	Apr. 01, 2014	Jan. 01, 2014	Sep. 30, 2015
April 2014 Acquisition [Member]
Business Combinations [Line Items]
Business combinations, effective date			Apr. 01, 2014
Business combinations, percentage of voting interests acquired			100.00%
Business combinations, description of acquired entity			a telecommunications services firm, specializing in the installation of in-home security systems
Business combinations, payments in cash (in dollars)	$ 16.3
April 2014 Acquisition [Member] | Earn-Out Arrangements [Member]
Business Combinations [Line Items]
Business combinations, contingent consideration, earn-out period (in years)			5 years
Business combinations, contingent consideration, fair value of earn-out (in dollars)			$ 0.6
January 2014 Acquisition [Member]
Business Combinations [Line Items]
Business combinations, effective date			Jan. 01, 2014
Business combinations, percentage of voting interests acquired			100.00%
Business combinations, description of acquired entity			a telecommunications services firm, specializing in the engineering, installation, furnishing and integration of telecommunications equipment
Business combinations, payments in cash (in dollars)		$ 23.8
January 2014 Acquisition [Member] | Earn-Out Arrangements [Member]
Business Combinations [Line Items]
Business combinations, contingent consideration, earn-out period (in years)			5 years
Business combinations, contingent consideration, fair value of earn-out (in dollars)			$ 8.7

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Earnings Per Share (Schedule of Convertible Notes Premium Share Information) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 shares	Sep. 30, 2014 USD ($) shares $ / shares	Sep. 30, 2015 shares	Sep. 30, 2014 USD ($) shares $ / shares
Convertible Debt [Member]
Earnings Per Share [Line Items]
Premium shares (in shares)	0	3,199	0	6,460
2011 4.25% Notes [Member]
Earnings Per Share [Line Items]
Per share price, actual average (in dollars per share) | $ / shares		$ 29.73		$ 35.06
Premium value (in dollars) | $		$ 89,341		$ 122,748
2011 4.25% Notes [Member] | Convertible Debt [Member]
Earnings Per Share [Line Items]
Premium shares (in shares)		3,005		3,501
2011 4.25% Notes [Member] | Common Stock [Member]
Earnings Per Share [Line Items]
Number of conversion shares, principal amount (in shares)		6,268		6,268

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Condensed Unaudited Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized	145,000,000	145,000,000
Common stock, shares issued	87,951,049	87,614,955
Treasury stock, shares	8,094,004	2,876,311

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Segments and Related Information (Reconciliation of EBITDA to Consolidated Income from Continuing Operations before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
EBITDA Reconciliation:
EBITDA - Continuing operations	$ 67,800	$ 134,200	$ 164,400	$ 303,600
Interest expense, net	(11,964)	(12,643)	(35,845)	(37,595)
Depreciation and amortization	(42,196)	(41,747)	(128,048)	(111,996)
Income from continuing operations before income taxes	$ 13,639	$ 79,764	$ 522	$ 154,016

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Goodwill and Other Intangible Assets

9 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Note 4 - Goodwill and Other Intangible Assets

The following table provides details of goodwill by reportable segment (in millions):

	Communications		Oil and Gas		Electrical Transmission		Power Generation and Industrial		Total Goodwill
Balance as of September 30, 2015	$	418.5	$	378.8	$	149.9	$	117.6	$	1,064.8

Currency translation losses related to goodwill totaled $18.5 million and $4.7 million for the nine month periods ended September 30, 2015 and 2014, respectively. For the nine month period ended September 30, 2015, there were no additions to goodwill from new business combinations, and additions to goodwill from accruals of acquisition-related contingent consideration totaled $0.8 million. Additions to goodwill for the nine month period ended September 30, 2014 from new business combinations totaled $134.2 million, and additions to goodwill from accruals of acquisition-related contingent consideration totaled $4.6 million.

The following table provides a reconciliation of changes in other intangible assets for the period indicated (in millions):

	Other Intangible Assets
	Non-amortizing					Amortizing
	Trade Names		Pre-Qualifications			Customer Relationships and Backlog			Other (a)			Total
Other intangible assets, gross carrying amount as of December 31, 2014	$	34.8	$	93.3		$	199.8		$	26.3		$	354.2
Accumulated amortization						(90.3		)	(13.5		)	(103.8		)
Other intangible assets, net, as of December 31, 2014	$	34.8	$	93.3		$	109.5		$	12.8		$	250.4
Amortization expense						(20.1		)	(1.4		)	(21.5		)
Currency translation adjustments	—		(7.9		)	(1.8		)	(0.4		)	(10.1		)
Other intangible assets, net, as of September 30, 2015	$	34.8	$	85.4		$	87.6		$	11.0		$	218.8

(a) Consists principally of trade names and non-compete agreements.

Amortization expense associated with intangible assets for the three month periods ended September 30, 2015 and 2014 totaled $6.9 million and $6.6 million, respectively, and for the nine month periods ended September 30, 2015 and 2014, totaled $21.5 million and $17.0 million, respectively.

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Property and Equipment, Net (Schedule of Property and Equipment, Net) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Property and Equipment [Line Items]
Property and equipment	$ 1,138,600	$ 1,088,700
Less accumulated depreciation and amortization	(551,600)	(465,600)
Property and equipment, net	586,993	623,118
Land [Member]
Property and Equipment [Line Items]
Property and equipment	4,600	4,600
Building and Leasehold Improvements [Member]
Property and Equipment [Line Items]
Property and equipment	21,000	19,900
Machinery and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	966,600	926,100
Office Furniture and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	135,600	126,100
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment	$ 10,800	$ 12,000

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Equity (Accumulated Other Comprehensive Loss) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Equity [Abstract]
Accumulated other comprehensive losses	$ 66,054		$ 66,054		$ 34,004
Unrealized foreign currency translation losses	$ 13,330	$ 12,951	$ 32,050	$ 10,611

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Lease Obligations (Operating Leases) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Lease Term in Excess of One Year [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense (in dollars)	$ 20.5	$ 18.1	$ 59.9	$ 51.5
Lease Term in Excess of One Year [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Operating leases, term of contract (in years)	1 year	1 year	1 year	1 year
Lease Term of One Year or Less [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense (in dollars)	$ 51.4	$ 54.5	$ 148.5	$ 142.6
Lease Term of One Year or Less [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Operating leases, term of contract (in years)	1 year	1 year	1 year	1 year

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Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill by Segment

The following table provides details of goodwill by reportable segment (in millions):

	Communications		Oil and Gas		Electrical Transmission		Power Generation and Industrial		Total Goodwill
Balance as of September 30, 2015	$	418.5	$	378.8	$	149.9	$	117.6	$	1,064.8

Rollforward of Other Intangible Assets

The following table provides a reconciliation of changes in other intangible assets for the period indicated (in millions):

	Other Intangible Assets
	Non-amortizing					Amortizing
	Trade Names		Pre-Qualifications			Customer Relationships and Backlog			Other (a)			Total
Other intangible assets, gross carrying amount as of December 31, 2014	$	34.8	$	93.3		$	199.8		$	26.3		$	354.2
Accumulated amortization						(90.3		)	(13.5		)	(103.8		)
Other intangible assets, net, as of December 31, 2014	$	34.8	$	93.3		$	109.5		$	12.8		$	250.4
Amortization expense						(20.1		)	(1.4		)	(21.5		)
Currency translation adjustments	—		(7.9		)	(1.8		)	(0.4		)	(10.1		)
Other intangible assets, net, as of September 30, 2015	$	34.8	$	85.4		$	87.6		$	11.0		$	218.8

(a) Consists principally of trade names and non-compete agreements.

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Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Activity, Stock Options) (Details) - USD ($) $ / shares in Units, $ in Millions				9 Months Ended
		Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2015
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value
Options outstanding, vested, weighted average remaining contractual life (in years)		9 months 15 days	1 year 3 months 15 days
Options exercisable, weighted average remaining contractual life (in years)		9 months 15 days	1 year 3 months 15 days
Options outstanding, vested, aggregate intrinsic value (in dollars)	[1]	$ 0.6	$ 3.0	$ 0.6
Options exercisable, aggregate intrinsic value (in dollars)	[1]	$ 0.6	$ 3.0	$ 0.6
Common Stock [Member]
Stock Options
Options outstanding, vested, beginning balance (in shares)				284,671
Options exercisable, beginning balance (in shares)				284,671
Exercised (in shares)				(71,971)
Options outstanding, vested, ending balance (in shares)		212,700	284,671	212,700
Options exercisable, ending balance (in shares)		212,700	284,671	212,700
Per Share Weighted Average Exercise Price
Options outstanding, vested, per share weighted average exercise price, beginning balance (in dollars per share)				$ 12.06
Options exercisable, per share weighted average exercise price, beginning balance (in dollars per share)				12.06
Options outstanding, vested, per share weighted average exercise price, ending balance (in dollars per share)		$ 13.10	$ 12.06	13.10
Options exercisable, per share weighted average exercise price, ending balance (in dollars per share)		$ 13.10	$ 12.06	13.10
Common Stock [Member] | Stock Options [Member]
Per Share Weighted Average Exercise Price
Exercised (in dollars per share)				$ 9.00

[1] Amount represents the difference between the exercise price and the closing share price of the Company’s stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options.

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Earnings Per Share (Methodology) (Narrative) (Details)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Computation of earnings per share, methodology	Basic earnings or loss per share is computed by dividing net income or loss available to MasTec’s common shareholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share is computed by dividing net income available to MasTec’s common shareholders by the number of fully diluted shares, which includes the effect of dilutive potential issuances of common shares as determined using income from continuing operations, including the potential issuance of common shares upon the exercise, conversion or vesting of outstanding stock options and unvested restricted shares, as calculated under the treasury stock method, as well as shares associated with the Company’s convertible debt securities, which matured and were converted in 2014. If the Company reports a loss, rather than income, from continuing operations, the computation of diluted loss per share excludes dilutive common stock equivalents as their effect would be anti-dilutive. For the nine month period ended September 30, 2015, the Company reported a net loss from continuing operations, and 648,379 dilutive common shares were excluded from the calculation of diluted net loss per share for the related period. Therefore, diluted and basic earnings per share were the same in this period.

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Segments and Related Information

9 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Segments and Related Information

Note 14 - Segments and Related Information    

Segment Discussion

MasTec manages its continuing operations under five operating segments, which represent MasTec’s five reportable segments: (1) Communications; (2) Oil and Gas; (3) Electrical Transmission; (4) Power Generation and Industrial and (5) Other. This structure is generally focused on broad end-user markets for MasTec’s labor-based construction services.All five reportable segments derive their revenue from the engineering, installation and maintenance of infrastructure, primarily in North America. In the first quarter of 2015, the Company reevaluated the activities of a non-controlled Canadian joint venture associated with a 2014 acquisition. Accordingly, segment information for prior periods has been adjusted retrospectively to conform to the current period presentation. The reclassified amounts were not material in the periods previously presented. See Note 16 - Segments and Related Information in the Company’s 2014 Form 10-K for additional details.

The Communications segment performs engineering, construction and maintenance of communications infrastructure primarily related to wireless and wireline/fiber communications and install-to-the-home customers, and, to a lesser extent, infrastructure for electrical utilities.MasTec performs engineering, construction and maintenance services on oil and natural gas pipelines and processing facilities for the energy and utilities industries through its Oil and Gas segment.The Electrical Transmission segment primarily serves the energy and utility industries through the engineering, construction and maintenance of electrical transmission lines and substations.The Power Generation and Industrial segment primarily serves energy, utility and other end-markets through the installation and construction of conventional and renewable power facilities, related electrical transmission infrastructure, ethanol facilities and various types of industrial infrastructure.The Other segment primarily includes a proportionately consolidated joint venture and other small business units that perform construction services for a variety of end-markets in Canada, Mexico and elsewhere internationally.

Earnings before interest, taxes, depreciation and amortization (“EBITDA”) is the measure of profitability used by management to manage its segments and, accordingly, in its segment reporting. As appropriate, the Company supplements the reporting of consolidated financial information determined in accordance with U.S. GAAP with certain non-U.S. GAAP financial measures, including EBITDA. The Company believes these non-U.S. GAAP measures provide meaningful information and help investors in understanding the Company’s financial results and in assessing its prospects for future performance. The Company uses EBITDA to evaluate its performance, both internally and versus that of its peers, because it excludes certain items that may not be indicative of the Company’s reportable segment results, as well as items that can vary widely across different industries or among companies within the same industry. Segment EBITDA is calculated in a manner consistent with consolidated EBITDA.

For the three and nine month periods ended September 30, 2015: (i) Communications segment EBITDA included $1.2 million and $17.8 million, respectively, of acquisition integration costs resulting from the WesTower acquisition; (ii) Electrical Transmission segment EBITDA included a $12.2 million charge relating to a court mandated mediation settlement; (iii) Other segment EBITDA included $2.8 million and $8.3 million, respectively, of project losses on a non-controlled proportionately consolidated Canadian joint venture; (iv) Corporate segment EBITDA included $4.1 million and $14.6 million, respectively, of Audit Committee independent investigation related costs; and (v) Power Generation and Industrial segment EBITDA included $3.8 million and $21.4 million, respectively, of losses on a Canadian wind project.

Summarized financial information for MasTec’s reportable segments is presented and reconciled to consolidated financial information for total MasTec in the following tables (in millions):

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2015			2014			2015			2014
Revenue:				As Restated						As Restated
Communications (a)	$	513.3		$	505.2		$	1,452.1		$	1,480.4
Oil and Gas	406.9			554.4			1,144.2			1,299.3
Electrical Transmission	75.9			138.4			270.2			329.1
Power Generation and Industrial	115.0			114.3			302.3			263.1
Other	3.8			4.1			17.2			10.6
Eliminations	(3.9		)	(0.9		)	(5.1		)	(2.0		)
Consolidated revenue	$	1,111.0		$	1,315.5		$	3,180.9		$	3,380.5

(a) Revenue generated by utilities customers represented 11.2% and 7.6% of Communications segment revenue for the three month periods ended September 30, 2015 and 2014, respectively, and represented 10.5% and 7.0% for the nine month periods ended September 30, 2015 and 2014, respectively.

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2015			2014			2015			2014
EBITDA - Continuing Operations:				As Restated						As Restated
Communications	$	49.7		$	52.5		$	141.8		$	153.7
Oil and Gas	51.0			73.4			113.9			144.2
Electrical Transmission	(23.7		)	18.5			(47.6		)	35.1
Power Generation and Industrial	4.8			4.9			3.9			9.4
Other	(2.0		)	(0.7		)	(7.1		)	(0.1		)
Corporate	(12.0		)	(14.4		)	(40.5		)	(38.7		)
Consolidated EBITDA - Continuing operations	$	67.8		$	134.2		$	164.4		$	303.6

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
Depreciation and Amortization:	2015		2014		2015		2014
Communications	$	13.2	$	10.1	$	37.6	$	30.1
Oil and Gas	20.0		23.3		64.3		61.3
Electrical Transmission	5.5		5.2		16.0		11.9
Power Generation and Industrial	1.7		1.7		5.0		4.8
Other	0.0		0.0		0.1		0.0
Corporate	1.8		1.4		5.0		3.9
Consolidated depreciation and amortization	$	42.2	$	41.7	$	128.0	$	112.0

The following table presents a reconciliation of EBITDA to consolidated income from continuing operations before income taxes (in millions):

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2015			2014			2015			2014
EBITDA Reconciliation:				As Restated						As Restated
EBITDA - Continuing operations	$	67.8		$	134.2		$	164.4		$	303.6
Less:
Interest expense, net	(12.0		)	(12.6		)	(35.8		)	(37.6		)
Depreciation and amortization	(42.2		)	(41.7		)	(128.0		)	(112.0		)
Income from continuing operations before income taxes	$	13.6		$	79.8		$	0.5		$	154.0

Foreign Operations. MasTec operates in North America, primarily in the United States and Canada, as well as in Mexico and in other countries in Latin America. For the three month periods ended September 30, 2015 and 2014, revenue of $1.0 billion and $1.1 billion, respectively, was derived from U.S. operations, and revenue of $115.2 million and $219.7 million, respectively, was derived from foreign operations, primarily in Canada. For the nine month periods ended September 30, 2015 and 2014, revenue of $2.7 billion and $2.9 billion, respectively, was derived from U.S. operations, and revenue of $451.2 million and $460.3 million, respectively, was derived from foreign operations, primarily in Canada. The majority of the Company’s foreign operations during the three and nine month periods ended September 30, 2015 and 2014 were in the Company’s Oil and Gas segment. Long-lived assets held in the United States included property and equipment, net, of $482.4 million and $494.1 million as of September 30, 2015 and December 31, 2014, respectively. Long-lived assets held in foreign countries, primarily in Canada, included property and equipment, net, of $104.6 million and $129.0 million as of September 30, 2015 and December 31, 2014, respectively. As of both September 30, 2015 and December 31, 2014 intangible assets and goodwill, net, totaled approximately $1.1 billion related to the Company’s U.S. operations. Intangible assets and goodwill, net, of approximately $193.9 million and $227.7 million as of September 30, 2015 and December 31, 2014, respectively, related to businesses in foreign countries, primarily in Canada. Foreign customers accounted for approximately 16% and 20% of the Company’s consolidated net accounts receivable position, which represents accounts receivable, net, less billings in excess of costs and earnings, as of September 30, 2015 and December 31, 2014, respectively.

Significant Customers

Revenue concentration information for significant customers as a percentage of total consolidated revenue was as follows:

	For the Three Months Ended September 30,		For the Nine Months Ended September 30,
	2015	2014	2015	2014
Customer:		As Restated		As Restated
AT&T (including DIRECTV®) (a)(b)	31%	28%	31%	33%
Enbridge, Inc. (c)	0%	10%	1%	10%

(a) The Company’s relationship with AT&T is based upon multiple separate master service agreements, other service agreements and construction/installation contracts for AT&T’s (i) wireless, (ii) wireline/fiber, (iii) home security and automation businesses, and (iv) for DIRECTV® services, is based upon an agreement to provide installation and maintenance services. Revenue from AT&T is included in the Communications segment.

(b) DIRECTV® was acquired by AT&T in July 2015. Revenue from DIRECTV® is presented on a combined basis with AT&T for all periods.

(c) The Company’s relationship with Enbridge, Inc. is based upon various construction contracts for natural gas pipelines. Revenue from Enbridge, Inc. is included in the Oil and Gas segment.

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Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets
Current assets	$ 1,238,314	$ 1,531,751
Property and equipment, net	586,993	623,118
Goodwill and other intangible assets, net	1,283,600	1,332,800
Investments in and advances to consolidated affiliates, net	0	0
Other long-term assets	136,896	76,272
Total assets	3,245,786	3,563,980
Liabilities and equity
Total current liabilities	787,410	980,848
Long-term debt	1,098,585	1,061,159
Advances from consolidated affiliates, net		0
Other long-term liabilities	335,300	373,900
Total liabilities	2,221,302	2,415,905
Total equity	1,024,484	1,148,075
Total liabilities and equity	3,245,786	3,563,980
Reportable Legal Entities [Member] | MasTec, Inc. [Member]
Assets
Current assets	0	0
Property and equipment, net	0	0
Goodwill and other intangible assets, net	0	0
Investments in and advances to consolidated affiliates, net	2,036,400	2,108,400
Other long-term assets	9,300	9,300
Total assets	2,045,700	2,117,700
Liabilities and equity
Total current liabilities	0	0
Long-term debt	0	0
Advances from consolidated affiliates, net		0
Other long-term liabilities	0	0
Total liabilities	0	0
Total equity	2,045,700	2,117,700
Total liabilities and equity	2,045,700	2,117,700
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Assets
Current assets	1,007,700	1,249,600
Property and equipment, net	464,900	472,600
Goodwill and other intangible assets, net	1,055,600	1,068,300
Investments in and advances to consolidated affiliates, net	95,700	0
Other long-term assets	38,700	28,700
Total assets	2,662,600	2,819,200
Liabilities and equity
Total current liabilities	666,600	777,400
Long-term debt	1,068,100	1,027,300
Advances from consolidated affiliates, net		70,700
Other long-term liabilities	227,400	239,300
Total liabilities	1,962,100	2,114,700
Total equity	700,500	704,500
Total liabilities and equity	2,662,600	2,819,200
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Assets
Current assets	230,600	282,200
Property and equipment, net	122,100	150,500
Goodwill and other intangible assets, net	228,000	264,500
Investments in and advances to consolidated affiliates, net	1,083,800	1,097,000
Other long-term assets	88,900	38,300
Total assets	1,753,400	1,832,500
Liabilities and equity
Total current liabilities	120,800	203,400
Long-term debt	30,500	33,900
Advances from consolidated affiliates, net		0
Other long-term liabilities	107,900	134,600
Total liabilities	259,200	371,900
Total equity	1,494,200	1,460,600
Total liabilities and equity	1,753,400	1,832,500
Eliminations [Member]
Assets
Current assets	0	0
Property and equipment, net	0	0
Goodwill and other intangible assets, net	0	0
Investments in and advances to consolidated affiliates, net	(3,215,900)	(3,205,400)
Other long-term assets	0	0
Total assets	(3,215,900)	(3,205,400)
Liabilities and equity
Total current liabilities	0	0
Long-term debt	0	0
Advances from consolidated affiliates, net		(70,700)
Other long-term liabilities	0	0
Total liabilities	0	(70,700)
Total equity	(3,215,900)	(3,134,700)
Total liabilities and equity	$ (3,215,900)	$ (3,205,400)