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, 2017

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 whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

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

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.   ¨

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 30, 2017, MasTec, Inc. had 82,760,624 shares of common stock, $0.10 par value, outstanding.

MASTEC, INC.

FORM 10-Q

QUARTER ENDED SEPTEMBER 30, 2017

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	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	29
Item 3	Quantitative and Qualitative Disclosures About Market Risk	41
Item 4	Controls and Procedures	41
Part II. OTHER INFORMATION		42
Item 1	Legal Proceedings	42
Item 1A	Risk Factors	42
Item 2	Unregistered Sales of Equity Securities and Use of Proceeds	42
Item 4	Mine Safety Disclosures	42
Item 6	Exhibits	42
SIGNATURES		43

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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
	2017			2016			2017			2016
Revenue	$	1,955,752		$	1,586,181		$	5,004,116		$	3,792,811
Costs of revenue, excluding depreciation and amortization	1,726,173			1,368,988			4,323,642			3,321,571
Depreciation and amortization	50,101			42,584			138,384			122,249
General and administrative expenses	66,397			67,131			202,001			195,031
Interest expense, net	17,578			13,097			44,966			37,895
Equity in (earnings) losses of unconsolidated affiliates	(7,399		)	6			(15,105		)	(3,549		)
Other income, net	(4,677		)	(971		)	(4,102		)	(12,803		)
Income before income taxes	$	107,579		$	95,346		$	314,330		$	132,417
Provision for income taxes	(43,378		)	(38,816		)	(126,170		)	(54,331		)
Net income	$	64,201		$	56,530		$	188,160		$	78,086
Net income attributable to non-controlling interests	449			253			1,770			414
Net income attributable to MasTec, Inc.	$	63,752		$	56,277		$	186,390		$	77,672
Earnings per share (Note 2):
Basic earnings per share	$	0.79		$	0.70		$	2.31		$	0.97
Basic weighted average common shares outstanding	80,953			80,462			80,859			80,323
Diluted earnings per share	$	0.77		$	0.69		$	2.27		$	0.96
Diluted weighted average common shares outstanding	82,386			81,545			82,281			81,241

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

(in thousands)

	For the Three Months Ended September 30					For the Nine Months Ended September 30
	2017		2016			2017			2016
Net income	$	64,201	$	56,530		$	188,160		$	78,086
Other comprehensive income:
Foreign currency translation gains (losses), net of tax	641		(1,454		)	2,415			4,417
Unrealized gains (losses) on equity investee activity, net of tax	808		(345		)	(1,287		)	(12,932		)
Comprehensive income	$	65,650	$	54,731		$	189,288		$	69,571
Comprehensive income attributable to non-controlling interests	449		253			1,770			414
Comprehensive income attributable to MasTec, Inc.	$	65,201	$	54,478		$	187,518		$	69,157

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

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MASTEC, INC.

CONDENSED UNAUDITED CONSOLIDATED BALANCE SHEETS

(in thousands, except shares and per share amounts)

	September 30, 2017			December 31, 2016
Assets
Current assets:
Cash and cash equivalents	$	43,822		$	38,767
Accounts receivable, net	1,534,790			1,156,031
Inventories, net	84,460			111,031
Prepaid expenses	53,832			41,548
Other current assets	30,843			55,109
Total current assets	$	1,747,747		$	1,402,486
Property and equipment, net	691,430			549,084
Goodwill, net	1,135,450			995,874
Other intangible assets, net	195,454			179,711
Other long-term assets	172,094			55,977
Total assets	$	3,942,175		$	3,183,132
Liabilities and equity
Current liabilities:
Current portion of long-term debt	$	86,547		$	64,600
Accounts payable	457,213			363,668
Accrued salaries and wages	119,553			67,126
Other accrued expenses	128,769			112,291
Billings in excess of costs and earnings	111,898			161,459
Other current liabilities	98,171			70,846
Total current liabilities	$	1,002,151		$	839,990
Long-term debt	1,192,311			961,379
Deferred income taxes	274,465			178,355
Other long-term liabilities	170,203			99,774
Total liabilities	$	2,639,130		$	2,079,498
Commitments and contingencies (Note 14)
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 - 90,843,339 and 90,634,771 (including 1,790,632 and 1,927,286 of unvested restricted shares) as of September 30, 2017 and December 31, 2016, respectively	9,084			9,063
Capital surplus	800,297			788,914
Retained earnings	696,331			509,941
Accumulated other comprehensive loss	(64,686		)	(65,814		)
Treasury stock, at cost: 8,094,004 shares as of both September 30, 2017 and December 31, 2016	(145,573		)	(145,573		)
Total MasTec, Inc. shareholders’ equity	$	1,295,453		$	1,096,531
Non-controlling interests	$	7,592		$	7,103
Total equity	$	1,303,045		$	1,103,634
Total liabilities and equity	$	3,942,175		$	3,183,132

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
	2017			2016
Cash flows from operating activities:
Net income	$	188,160		$	78,086
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	138,384			122,249
Non-cash interest expense, net	2,375			2,209
Non-cash stock-based compensation expense	10,551			11,291
Provision for (benefit from) deferred income taxes	92,188			(1,339		)
Equity in earnings of unconsolidated affiliates	(15,105		)	(3,549		)
(Gains) losses on sales of assets, net, including fixed assets held-for-sale	(3,335		)	378
Other non-cash items, net	14,920			1,951
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(334,383		)	(302,590		)
Inventories	33,579			(18,900		)
Other assets, current and long-term portion	(61,900		)	48,032
Accounts payable and accrued expenses	132,963			172,731
Billings in excess of costs and earnings	(54,199		)	16,581
Book overdrafts	(4,603		)	8,883
Other liabilities, current and long-term portion	39,030			(8,872		)
Net cash provided by operating activities	$	178,625		$	127,141
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(115,995		)	(4,102		)
Capital expenditures	(83,330		)	(89,050		)
Proceeds from sale of property and equipment	13,585			6,824
Payments for other investments	(77,105		)	(8,858		)
Proceeds from other investments	13,416			1,125
Net cash used in investing activities	$	(249,429	)	$	(94,061	)
Cash flows from financing activities:
Proceeds from credit facilities	2,002,430			1,186,816
Repayments of credit facilities	(1,840,409		)	(1,149,930		)
Repayments of other borrowings	(12,080		)	(8,188		)
Payments of capital lease obligations	(48,748		)	(41,828		)
Payments of acquisition-related contingent consideration	(18,843		)	(19,822		)
Distributions to non-controlling interests	(1,280		)	—
Proceeds from stock-based awards, net	853			3,938
Other financing activities, net	(6,301		)	1,385
Net cash provided by (used in) financing activities	$	75,622		$	(27,629	)
Effect of currency translation on cash	237			(1,008		)
Net increase in cash and cash equivalents	$	5,055		$	4,443
Cash and cash equivalents - beginning of period	$	38,767		$	4,984
Cash and cash equivalents - end of period	$	43,822		$	9,427

Supplemental cash flow information:
Interest paid	$	47,163	$	40,433
Income taxes paid, net of refunds	$	77,533	$	15,141
Supplemental disclosure of non-cash information:
Acquisition-related contingent consideration, new business combinations	$	89,614	$	—
Equipment acquired under capital lease and financing arrangements	$	129,567	$	13,015
Accrued capital expenditures	$	1,345	$	4,119

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, install-to-the-home and customer fulfillment activities; petroleum and natural gas pipeline infrastructure; electrical utility transmission and distribution; power generation; heavy civil; 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, 2016 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, 2016 contained in the Company’s 2016 Annual Report on Form 10-K (the “2016 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.

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. All significant intercompany balances and transactions have been eliminated in consolidation. Other parties’ interests in entities that MasTec consolidates 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 for 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, or, for investments in a net liability position, within other long-term liabilities. Income or loss from these investments is recorded as a separate line item in the statements of operations. Intercompany profits or losses associated with the Company’s equity method investments are eliminated until realized by the investee in transactions with third parties. For equity investees in which the Company has an undivided interest in the assets, liabilities and profits or losses of an unincorporated entity, but the Company does not exercise control over the entity, the Company consolidates its proportional interest in the accounts of the entity. The cost method is used for investments in entities for which the Company does not have the ability to exert significant influence.

Management determines whether each business entity in which it has equity interests, debt, or other investments constitutes a variable interest entity (“VIE”) based on the nature and characteristics of such arrangements. If an investment arrangement is determined to be a VIE, then management determines if the Company is the VIE’s primary beneficiary by evaluating several factors, including the Company’s: (i) risks and responsibilities; (ii) ownership interests; (iii) decision making powers; and (iv) financial interests, among other factors. If management determines the Company is the primary beneficiary of a VIE, then it would be consolidated, and other parties’ interests in the VIE would be accounted for as non-controlling interests. 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. As of September 30, 2017, the Company determined that certain of its investment arrangements were VIEs; however, because it does not have the power to direct the primary activities that most significantly impact the economic performance of these VIEs, the Company is not the primary beneficiary, and accordingly, has not consolidated these VIEs.

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 their local currency as their functional currency. Currency gains or losses resulting from transactions executed in currencies other than the functional currency are included in other income or expense, net. In these condensed unaudited consolidated financial statements, “$” means U.S. dollars unless otherwise noted.

Management Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires the use of estimates and assumptions that affect

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the amounts reported in the consolidated 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 project-related depreciation), in particular, on construction contracts accounted for under the percentage-of-completion method, for which the recorded amounts require estimates of costs to complete and the amount of probable contract price adjustments; allowances for doubtful accounts; estimated fair values of goodwill and intangible assets; acquisition-related contingent consideration and investments in equity investees; asset lives used in computing depreciation and amortization; fair values of financial instruments; accrued self-insured claims; share-based compensation; other accruals and allowances; accounting for income taxes; and the estimated impact of litigation and other contingencies. While management believes that such estimates are reasonable when considered in conjunction with the Company’s consolidated financial position and results of operations taken as a whole, actual results could differ materially from those estimates.

Significant Accounting Policies

Revenue Recognition

Revenue is derived from construction projects performed under master and other service agreements as well as from 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 services under unit price or fixed price master service or other service agreements. 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 32% and 38% of consolidated revenue for the three month periods ended September 30, 2017 and 2016, respectively, and totaled 35% and 43% for the nine month periods ended September 30, 2017 and 2016, respectively. 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. 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 project managers, engineers and financial professionals. Management reviews estimates of contract revenue and costs on an ongoing basis. Changes in job performance, job conditions and management’s assessment of expected contract settlements are factors that influence estimates of total contract value and total 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. For both the nine month periods ended September 30, 2017 and 2016, project profit was affected by less than 5% as a result of changes in contract estimates included in projects that were in process as of December 31, 2016 and 2015. 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 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 such costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, and defers costs 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, 2017 and December 31, 2016, the Company had approximately $77 million and $17 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 earned and that management believes is probable of collection. As of both September 30, 2017 and December 31, 2016, these change orders were primarily related to contracts in the Oil and Gas segment. The Company actively engages in substantive meetings with its customers to complete the final approval process, and generally 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 Earnings (“BIEC”) on uncompleted contracts is classified within current liabilities. Costs and Earnings In Excess of Billings (“CIEB”), which is also referred to as work in process, is classified within current assets. Work in process on contracts is based on work performed but not yet billed to customers as per individual contract terms.

Recently Issued Accounting Pronouncements

There have been no changes in the expected dates of adoption or estimated effects on the Company’s consolidated financial statements of recently issued accounting pronouncements from those disclosed in the Company’s 2016 Form 10-K. See below for additional discussion of recently issued accounting pronouncements.

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Accounting Pronouncements Not Yet Adopted

In August 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”)2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”). ASU 2017-12 amends the hedge accounting model in Topic 815 to enable entities to better portray the economics of their risk management activities in the financial statements and enhance the transparency and understandability of hedge results. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. The guidance also simplifies certain documentation and assessment requirements. ASU 2017-12 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. All transition requirements and elections should be applied to hedging relationships existing on the date of adoption and their effects should be reflected as of the beginning of the fiscal year of adoption. The presentation and disclosure requirements are effective on a prospective basis. The Company is currently evaluating the potential effect of this ASU on its consolidated financial statements.

In May 2017, FASB issued ASU 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting (“ASU 2017-09”). ASU 2017-09 clarifies when a change to the terms or conditions of a share-based payment award must be accounted for as a modification. Limited and administrative modifications that do not change the value, vesting conditions, or classification of the award are exempt from following the modification guidance in Topic 718. ASU 2017-09 is effective on a prospective basis for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted. The Company does not expect the adoption of this ASU to have a material effect on its consolidated financial statements.

In February 2017, the FASB issued ASU 2017-05, Other Income- Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets(“ASU 2017-05”). ASU 2017-05 clarifies certain guidance under Subtopic 610-20 that was issued as part of the new revenue standard, including the recognition of gains and losses on the sale or transfer of nonfinancial assets to noncustomers, and clarifies accounting for contributions of nonfinancial assets to joint ventures, among other requirements. ASU 2017-05 is effective on a retrospective basis for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted. The Company is currently evaluating the potential effect of this ASU 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 judgment and make estimates when evaluating contract terms and other relevant facts and circumstances. Additionally, ASU 2014-09 requires enhanced disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. 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 full retrospective or modified retrospective transition approach for fiscal years, and for interim periods within those years, beginning after December 15, 2017. In 2016, the FASB issued several accounting standards updates to clarify certain topics within ASU 2014-09. The Company will adopt ASU 2014-09, and its related clarifying ASUs, as of January 1, 2018.

The Company has substantially completed its assessment of the potential effects of these ASUs on its consolidated financial statements, business processes, systems and controls.  The Company’s assessment included a detailed review of representative contracts at each of the Company’s business units and a comparison of its historical accounting policies and practices to the new standard. Based on the Company’s review of various types of revenue arrangements, the Company expects to recognize revenue and earnings over time utilizing the cost-to-cost measure of progress for its fixed price contracts and certain master service and other service agreements, consistent with current practice.  For these contracts, the cost-to-cost measure of progress best depicts the transfer of control of goods or services to the customer under the new standard. The Company has substantially completed its analysis of the information necessary to enable the preparation of the financial statements and related disclosures under the new standard. As part of this analysis, the Company evaluated its information technology capabilities and systems, and does not expect to incur significant information technology costs to modify systems currently in place. The Company will implement targeted changes to its internal reporting processes to facilitate gathering the data needed for reporting and disclosure under the new standard. The Company will also implement updates to its control processes and procedures, as necessary, based on changes resulting from the new standard. The Company does not expect any such updates to materially affect the Company’s internal controls over financial reporting.

The Company anticipates adopting the standard using the modified retrospective transition approach.  Under this approach, the new standard would apply to all new contracts initiated on or after January 1, 2018.  For existing contracts that have remaining obligations as of January 1, 2018, any difference between the recognition criteria in these ASUs and the Company’s current revenue recognition practices would be recognized using a cumulative effect adjustment to the opening balance of retained earnings.  Any potential effect of adoption of these ASUs has not yet been quantified; however, based on the review of contracts across all of the Company’s business units to date, the adoption of these ASUs is not expected to have a material effect on the timing or amount of revenue recognized as compared to current practices.  The Company is training its business units for the implementation of the new standard, and continues developing the disclosures required by the new standard. The Company is also reviewing certain contracts entered into by its business units subsequent to its initial assessment that are expected to have performance obligations remaining as of January 1, 2018 for any cumulative effect adjustments that may be required upon adoption.

Accounting Pronouncements Adopted as of January 1, 2017

The Company adopted ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”) effective January 1, 2017. Under ASU 2016-09, excess tax benefits (“windfalls”) or tax deficiencies (“shortfalls”) are recognized in the income statement, rather than as additional paid-in-capital as under the previous guidance, and are presented as operating cash flows,

9

rather than as a financing activity. This ASU also increased the amount of tax that can be withheld by an employer for employee tax withholdings without resulting in liability classification of an award. Payments to taxing authorities for such employee withholdings are presented as financing activities. ASU 2016-09 also allows companies to account for forfeitures of share-based payments as they occur or to estimate such amounts. The provisions of ASU 2016-09 that were applicable to the Company were adopted on a prospective basis; the retrospective requirement to classify payments to taxing authorities for employee withholdings as a financing activity was consistent with the Company’s existing methodology, therefore did not result in a change. The adoption of ASU 2016-09 is expected to result in volatility in income tax expense given that windfalls or shortfalls are recognized in income tax expense in the periods in which they occur. The other components of this ASU did not have a material effect on the consolidated financial statements. See Note 2 - Earnings Per Share, Note 9 - Stock-Based Compensation and Other Employee Benefit Plans and Note 12 - Income Taxes for additional information.

Note 2 – Earnings Per Share

Basic earnings or loss per share is computed by dividing net income or loss attributable to MasTec by the weighted average number of common shares outstanding for the period, which excludes non-participating unvested restricted share awards. Diluted earnings per share is computed by dividing net income attributable to MasTec by the weighted average number of fully diluted shares, as calculated under the treasury stock method, which includes the potential effect of dilutive common stock equivalents, such as issued but unvested restricted shares and/or outstanding but unexercised stock options. The Company has no remaining outstanding stock options; all options under the Company’s stock option grants were exercised in 2016. If the Company reports a loss, rather than income, the computation of diluted loss per share excludes the effect of dilutive common stock equivalents, as their effect would be anti-dilutive.

As discussed in Note 1 - Business, Basis of Presentation and Significant Accounting Policies, the Company adopted ASU 2016-09 effective January 1, 2017 on a prospective basis. ASU 2016-09 changed the recognition of excess tax benefits or tax deficiencies upon the vesting of share-based payment awards from additional paid-in capital, within equity, to income tax benefit or expense, within the statement of operations. As a result, excess tax benefits or deficiencies under ASU 2016-09 are excluded from assumed proceeds under the treasury stock method. Previously, excess tax benefits or tax deficiencies were included within assumed proceeds. For both the three and nine month periods ended September 30, 2017, this resulted in the inclusion of approximately 0.3 million incremental shares in the Company’s total weighted average diluted shares outstanding.

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
	2017		2016		2017		2016
Net income attributable to MasTec:
Net income - basic and diluted (a)	$	63,752	$	56,277	$	186,390	$	77,672
Weighted average shares outstanding:
Weighted average shares outstanding - basic	80,953		80,462		80,859		80,323
Dilutive common stock equivalents	1,433		1,083		1,422		918
Weighted average shares outstanding - diluted	82,386		81,545		82,281		81,241
Additional information:
Weighted average anti-dilutive common stock equivalents (b)	—		1		12		—

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

(b) Represents anti-dilutive common stock equivalents as calculated under the treasury stock method.

Note 3 - Goodwill and Other Intangible Assets

The following table provides details of goodwill by reportable segment as of September 30, 2017 (in millions):

	Communications		Oil and Gas			Electrical Transmission		Power Generation and Industrial		Total Goodwill
Goodwill, gross	$	462.4	$	461.6		$	149.9	$	137.0	$	1,210.9
Accumulated impairment losses	—		(75.4		)	—		—		(75.4		)
Goodwill, net	$	462.4	$	386.2		$	149.9	$	137.0	$	1,135.5

For the nine month period ended September 30, 2017, additions to goodwill from new business combinations totaled $135.3 million. Currency translation effects related to goodwill and accumulated impairment losses totaled approximately $9.8 million of gains and $5.4 million of losses, respectively, for the nine month period ended September 30, 2017. For the nine month period ended September 30, 2016, additions to goodwill from accruals of acquisition-related contingent consideration totaled $5.8 million, and currency translation effects related to goodwill and accumulated impairment losses totaled $6.0 million of gains and $3.1 million of losses, respectively.

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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, as of December 31, 2016	$	34.5	$	74.6	$	195.1		$	19.1		$	323.3
Accumulated amortization					(131.9		)	(11.7		)	(143.6		)
Other intangible assets, net, as of December 31, 2016	$	34.5	$	74.6	$	63.2		$	7.4		$	179.7
Additions from new business combinations	—		—		24.4			2.4			26.8
Amortization expense					(13.9		)	(1.1		)	(15.0		)
Currency translation adjustments	—		3.4		0.5			0.1			4.0
Other intangible assets, net, as of September 30, 2017	$	34.5	$	78.0	$	74.2		$	8.8		$	195.5

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

Amortization expense associated with intangible assets for the three month periods ended September 30, 2017 and 2016 totaled $6.0 million and $5.2 million, respectively, and for the nine month periods ended September 30, 2017 and 2016, totaled $15.0 million and $15.7 million, respectively.

2017 Acquisitions.During the nine month period ended September 30, 2017, MasTec completed three acquisitions, including (i) a wireline/fiber deployment construction contractor, which is included in the Company’s Communications segment; (ii) a heavy civil construction services company, which is included in the Company’s Power Generation and Industrial segment, and (iii) an oil and gas pipeline equipment company, which is included in the Company’s Oil and Gas segment. Determination of the estimated fair values of the net assets acquired and the estimated earn-out liabilities for these acquisitions is preliminary as of September 30, 2017, and further adjustments to management’s preliminary estimates may occur.

The following table summarizes the estimated fair values of consideration paid and identifiable assets acquired and liabilities assumed as of the respective dates of acquisition (in millions).

Acquisition consideration:	2017
Cash	$	118.8
Fair value of contingent consideration (earn-out liability)	89.6
Total consideration transferred	$	208.4
Identifiable assets acquired and liabilities assumed:
Current assets, primarily composed of accounts receivable and $2.8 million of cash acquired	$	42.7
Property and equipment	56.9
Amortizing intangible assets	26.8
Other long-term assets	0.5
Current liabilities, including current portion of capital lease obligations and long-term debt	(28.4		)
Long-term debt, including capital lease obligations	(9.9		)
Deferred income taxes	(15.5		)
Total identifiable net assets	$	73.1
Goodwill	$	135.3
Total net assets acquired, including goodwill	$	208.4

Amortizing intangible assets related to the 2017 acquisitions are primarily composed of customer relationships, backlog and other amortizing intangible assets, which had weighted average lives of approximately 11 years, 4 years and 7 years, respectively, and 10 years in total, and will be amortized in a manner consistent with the pattern in which the related benefits are expected to be consumed. The goodwill balances for the respective acquisitions represent the estimated value of each acquired company’s geographic presence in key markets, their assembled workforce, and management team industry-specific project management expertise, as well as synergies expected to be achieved from the combined operations of the acquired companies and MasTec. Approximately $75 million of the acquired goodwill balance as of September 30, 2017 is expected to be tax deductible.

The contingent consideration included in the table above equals the acquired companies’ earnings before interest, taxes, depreciation and amortization (“EBITDA”) above certain thresholds, if applicable, for a period of five years, as set forth in the respective purchase agreements, which amounts are payable annually.The fair values of the earn-out liabilities were estimated using income approaches such as discounted cash flows or option pricing models and incorporate significant inputs not observable in the market. Key assumptions in the estimated valuations 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.

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For the three and nine month periods ended September 30, 2017, pro forma revenue totaled approximately $1,955.8 million and $5,077.4 million, respectively, and pro forma net income totaled approximately $64.4 million and $192.0 million, respectively. For the three and nine month periods ended September 30, 2016, pro forma revenue totaled approximately $1,634.5 million and $3,934.6 million, respectively, and pro forma net income totaled approximately $59.0 million and $81.5 million, respectively.

The above indicated unaudited pro forma financial results, which represent the results of operations of the companies acquired as if the acquired companies had been consolidated as of January 1, 2016, are provided for illustrative purposes only and do not purport to be indicative of the actual results that would have been achieved by the combined companies for the periods indicated, or of the results that may be achieved by the combined companies in the future. The unaudited supplemental pro forma financial results have been prepared by adjusting the historical results of MasTec to include the historical results of the acquired businesses described above, and then adjusted (i) to remove acquisition costs; (ii) to increase amortization expense resulting from the acquired intangible assets; (iii) to increase interest expense as a result of the cash consideration paid; (iv) to reduce interest expense from debt repaid upon acquisition; and (iv) to eliminate the effect of intercompany transactions. Additionally, the unaudited supplemental pro forma financial results do not include adjustments to reflect other cost savings or synergies that may have resulted from these acquisitions. Future results may vary significantly due to future events and transactions, as well as other factors, many of which are beyond MasTec’s control.

For the three and nine month periods ended September 30, 2017, acquisition-related results included in the Company’s consolidated results of operations included revenue of approximately $62.2 million and $96.1 million, respectively, and net income of approximately $3.2 million and $4.7 million, respectively.

Note 4 – 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, stock warrants, 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, accounts payable and other current liabilities approximate their fair values. Management believes the carrying values of notes and other receivables, cash collateral deposited with insurance carriers, deferred compensation plan assets and liabilities and outstanding balances on its credit facilities approximate their fair values.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

As of September 30, 2017 and December 31, 2016, financial instruments required to be measured at fair value on a recurring basis consisted primarily of acquisition-related contingent consideration, which represents the estimated fair value of future earn-outs payable for acquisitions of businesses (“ASC 805 contingent consideration”). ASC 805 contingent consideration is based on management estimates and entity-specific assumptions and is evaluated on an ongoing basis. As of September 30, 2017 and December 31, 2016, the fair value of the Company’s ASC 805 contingent consideration totaled $104.9 million and $45.8 million, respectively, of which $18.9 million and $21.8 million, respectively, was included within other current liabilities. The fair value of the Company’s ASC 805 contingent consideration is estimated using income approaches such as discounted cash flows or option pricing models and incorporates significant inputs not observable in the market.Key assumptions 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. As of September 30, 2017, the range of potential undiscounted earn-out liabilities was estimated to be between $15 million and $170 million; however, there is no maximum payment amount.

ASC 805 contingent consideration activity consists primarily of additions from new business combinations, payments of earn-out liabilities, changes in the expected fair value of future earn-out obligations, and, for earn-out liabilities denominated in foreign currencies, translation gains or losses. Fair value adjustments are recorded within other income or expense, and foreign currency translation activity is recorded within other comprehensive income or loss, as appropriate. For the three and nine month periods ended September 30, 2017, additions from new business combinations totaled $64.6 million and $89.6 million, respectively. There were no payments of ASC 805 contingent consideration for the three month period ended September 30, 2017, and payments totaled $18.8 million for the nine month period ended September 30, 2017. For the three and nine month periods ended September 30, 2016, payments totaled $5.3 million and $15.8 million, respectively. Foreign currency translation activity was de minimis for both the three and nine month periods ended September 30, 2017 and September 30, 2016. The Company recognized reductions in the expected fair value of future earn-out obligations totaling $3.0 million and $11.6 million for certain acquired businesses in the Communications and Electrical Transmission segments for the three and nine month periods ended September 30, 2017, respectively, and, during the first quarter of 2016, the Company recognized a net reduction in the expected fair value of future earn-out obligations of $2.3 million for certain of the Company’s western Canadian oil and gas businesses.

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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 and debt.

As of both September 30, 2017 and December 31, 2016, the gross carrying amount of the Company’s 4.875% senior notes due 2023 (the “4.875% Senior Notes”) totaled $400 million. As of September 30, 2017 and December 31, 2016, 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 $407.0 million and $388.0 million, respectively.

Cost and Equity Investees. The Company’s cost and equity investees as of September 30, 2017 are primarily composed of: (i) the Company’s equity interests in Trans-Pecos Pipeline, LLC (“TPP”) and Comanche Trail Pipeline, LLC (“CTP,” and together with TPP, the “Waha JVs”); (ii) the Company’s interests in a pre-acquisition equity method investment of Pacer Construction Holdings Corporation and its affiliated operating companies (collectively, “Pacer”); (iii) a $15 million cost investment in Cross Country Infrastructure Services, Inc. (“CCI,” previously, Cross Country Pipeline Supply, Inc.); (iv) the Company’s interests in its proportionately consolidated non-controlled contractual joint ventures; (v) the Company’s equity interests in Pensare Acquisition Corp. (“Pensare”); and (vi) certain other cost and equity method investments. See Note 15 - Related Party Transactions.

The fair values of the Company’s cost and equity method investments are not readily observable. 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 investments as of September 30, 2017 or December 31, 2016. Cumulative undistributed earnings from equity method investees totaled $10.6 million as of September 30, 2017.

The Waha JVs. The Waha JVs own and operate two pipelines and a header system that transport natural gas to the Mexican border for export. These pipelines commenced operations in the first half of 2017. There were no equity or other contributions to these joint ventures for the three month period ended September 30, 2017, and for the nine month period ended September 30, 2017, equity and other contributions totaled $73.3 million. As collateral for its equity commitments in the Waha JVs, the Company has issued letters of credit (the “Equity LC Amount”), of which $19 million and $91 million, respectively, were outstanding as of September 30, 2017 and December 31, 2016. Equity in earnings related to the Company’s proportionate share of income from the Waha JVs, which is included within the Company’s Other segment, totaled approximately $7.4 million and $15.1 million for the three and nine month periods ended September 30, 2017, respectively. Equity in earnings from the Waha JVs for the nine month period ended September 30, 2016 was de minimis.

The Waha JVs are party to certain interest rate swaps. The Company reflects its proportionate share of any unrealized fair market value gains or losses from fluctuations in interest rates associated with these swaps within other comprehensive income or loss, as appropriate. For the three month period ended September 30, 2017, the Company’s proportionate share of unrecognized unrealized activity on these interest rate swaps was a gain of approximately $1.3 million or $0.8 million, net of tax, and for the nine month period, this activity was a loss of approximately $2.1 million, or $1.3 million, net of tax. For the three and nine month periods ended September 30, 2016, the Company’s proportionate share of unrecognized unrealized activity on these interest rate swaps was a loss of approximately $0.6 million and $21.1 million, respectively, or $0.3 million and $12.9 million, net of tax, respectively.

Certain subsidiaries of MasTec have provided pipeline construction services to the Waha JVs. For the three and nine month periods ended September 30, 2017, revenue recognized in connection with work performed for the Waha JVs, including intercompany eliminations, totaled $3.6 million and $255.2 million, respectively, and for the three and nine month periods ended September 30, 2016, totaled $80.9 million and $142.8 million, respectively. As of September 30, 2017 and December 31, 2016, related receivables, including retainage, net of BIEC, totaled $52.2 million and $71.2 million, respectively. As of September 30, 2017 and December 31, 2016, the Company’s net investment in the Waha JVs represented an asset totaling approximately $115 million and $6 million, respectively. The Company’s net investment in the Waha JVs differs from its proportionate share of the net assets of the Waha JVs due to capitalized investment costs as well as the effect of intercompany eliminations.

Other investments. In connection with the 2014 acquisition of Pacer, the Company acquired equity interests in two joint ventures. There are no remaining amounts expected to be advanced in connection with these investments, and as of March 2016, all related project work had been completed. In the first quarter of 2016, revenue recognized by Pacer on behalf of these entities totaled $0.6 million. One of these entities was liquidated in 2016, and the second, which is in the final stages of liquidation, is being managed by a receiver to assist with the orderly wind-down of its operations. In the first quarter of 2016, $3.6 million of income was recognized related to changes in expected recoveries from these investments. The Company received $12.1 million of proceeds from the receiver in the first quarter of 2017. The remaining investment, for which the Company now has minimal involvement, is reviewed regularly by corporate management for potential changes in expected recovery estimates, and, during the second quarter of 2017, the Company recorded $5.8 million of expense related to changes in expected recovery amounts from this investment. The aggregate net carrying value of this investment, which represents expected recoveries under the receivership arrangement, totaled $14.8 million and $31.4 million as of September 30, 2017 and December 31, 2016, respectively, which amounts are included within other current assets.

During the third quarter of 2017, the Company paid approximately $2.0 million for approximately 4% of the common stock of Pensare and warrants to purchase 2.0 million shares of Pensare common stock, which is a special purpose acquisition company focusing on transactions in the telecommunications industry. The shares of common stock purchased by MasTec are not transferable or salable until one year after Pensare successfully completes a business combination transaction, with limited exceptions, as specified in the agreement. The warrants purchased by MasTec are exercisable at a purchase price of $11.50 per share after Pensare successfully completes a business combination. Both the warrants and shares expire and/or are effectively forfeitable if Pensare does not successfully complete a business combination by February 1, 2019. The warrants, which are derivative financial instruments, and the shares, which are a cost method investment, are included within other long-term assets in the Company’s consolidated financial statements as of September 30, 2017. The fair value of the warrants, as determined based on Level 3 inputs, approximated their cost basis as of September 30, 2017. The fair value of the shares is not readily determinable due to the nature of the restrictions. José R. Mas, MasTec’s Chief Executive Officer, is a director of Pensare.

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Note 5 - 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, 2017			December 31, 2016
Contract billings	$	626.7		$	564.2
Retainage	287.6			268.6
Costs and earnings in excess of billings	629.5			331.6
Accounts receivable, gross	$	1,543.8		$	1,164.4
Less allowance for doubtful accounts	(9.0		)	(8.4		)
Accounts receivable, net	$	1,534.8		$	1,156.0

Retainage, which has been billed, but is not due until completion of performance and acceptance by customers, is 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 each of the three month periods ended September 30, 2017 and 2016 totaled $0.4 million, and for the nine month periods ended September 30, 2017 and 2016, totaled $1.1 million and $2.0 million, respectively.

The Company is party to non-recourse financing arrangements in the ordinary course of business, under which certain receivables are purchased by the customer’s bank in return for a nominal fee. These arrangements, under which amounts can vary based on levels of activity and changes in customer payment terms, improve the collection cycle time of the related receivables. The discount charge, which is included within interest expense, totaled approximately $2.1 million and $0.8 million, respectively, for the three month periods ended September 30, 2017 and 2016, and totaled approximately $4.7 million and $1.7 million, respectively, for the nine month periods ended September 30, 2017 and 2016.

Note 6 - 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, 2017			December 31, 2016
Land	$	4.6		$	4.6
Buildings and leasehold improvements	25.7			24.2
Machinery and equipment	1,237.3			997.8
Office furniture and equipment	149.6			146.1
Construction in progress	8.9			9.5
Total property and equipment	$	1,426.1		$	1,182.2
Less accumulated depreciation and amortization	(734.7		)	(633.1		)
Property and equipment, net	$	691.4		$	549.1

The gross amount of capitalized internal-use software, which is included within office furniture and equipment, totaled $108.7 million and $107.8 million as of September 30, 2017 and December 31, 2016, respectively. Capitalized internal-use software, net of accumulated amortization, totaled $24.8 million and $30.9 million as of September 30, 2017 and December 31, 2016, respectively. Depreciation and amortization expense associated with property and equipment for the three month periods ended September 30, 2017 and 2016 totaled $44.1 million and $37.4 million, respectively, and totaled $123.4 million and $106.5 million for the nine month periods ended September 30, 2017 and 2016, respectively.

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Note 7 - Debt

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

Description	Maturity Date	September 30, 2017			December 31, 2016
Senior secured credit facility:	February 22, 2022
Revolving loans		$	300.6		$	279.9
Term loan		400.0			237.5
4.875% Senior Notes	March 15, 2023	400.0			400.0
Capital lease obligations, weighted average interest rate of 3.5%	In installments through September 1, 2022	179.9			98.6
Notes payable and other debt obligations	Varies	12.1			19.8
Total long-term debt obligations		$	1,292.6		$	1,035.8
Less unamortized deferred financing costs		(13.8		)	(9.8		)
Total debt, net of deferred financing costs		$	1,278.8		$	1,026.0
Current portion of long-term debt		86.5			64.6
Long-term debt		$	1,192.3		$	961.4

Senior Secured Credit Facility

The Company has a senior secured credit facility (the “Credit Facility”), which was amended and restated on February 22, 2017. The Company refers to its amended and restated credit facility as the “2017 Credit Facility,” and to its previous credit facility as the “2016 Credit Facility.” The 2017 Credit Facility increased the Company’s aggregate borrowing commitments from approximately $1.2 billion to $1.5 billion, which amount is composed of $1.1 billion of revolving commitments and a term loan in the aggregate principal amount of $400 million. The amended and restated credit facility also extended the Credit Facility’s maturity date to February 22, 2022. As of September 30, 2017, term loans in the aggregate principal amount of $400 million were drawn under the 2017 Credit Facility. The term loan is subject to amortization in quarterly principal installments that commence in December 2017, which as of September 30, 2017, amounted to $3.1 million, which amount is subject to adjustment for additional term loans and, if applicable, for certain prepayments. As of December 31, 2016, term loans in the aggregate principal amount of $238 million were outstanding.

The 2017 Credit Facility also increased the amount the Company can borrow either in Canadian dollars and/or Mexican pesos up to an aggregate equivalent amount of $300 million. The maximum amount available for letters of credit under the 2017 Credit Facility is $650 million, of which up to $200 million can be denominated in either Canadian dollars and/or Mexican pesos. The Credit Facility also provides for swing line loans of up to $75 million, and, subject to certain conditions, the Company has the option to increase revolving commitments and/or establish additional term loan tranches up to an aggregate amount of $250 million. Subject to the terms and conditions described in the Credit Facility, these additional term loan tranches may rank equal or junior in respect of right of payment and/or collateral to the Credit Facility, and may have terms and pricing that differ from the 2017 Credit Facility. Borrowings under the Credit Facility are used for working capital requirements, capital expenditures and other corporate purposes, including investments in equity or other investees, potential acquisitions or other strategic arrangements, and the repurchase or prepayment of indebtedness.

Outstanding revolving loans and the term loan under the Credit Facility bear interest, at the Company’s option, at a rate equal to either (a) a Eurocurrency Rate, as defined in the 2017 Credit Facility, plus a margin of 1.25% to 2.00% (under the 2016 Credit Facility, the margin was from 1.00% to 2.00%), or (b) a Base Rate, as defined in the 2017 Credit Facility, plus a margin of 0.25% to 1.00% (under the 2016 Credit Facility, the margin was from 0.00% to 1.00%). The Base Rate equals the highest of (i) the Federal Funds Rate, as defined in the Credit Facility, plus 0.50%, (ii) Bank of America’s prime rate, and (iii) the Eurocurrency Rate plus 1.00%.Financial standby letters of credit and commercial letters of credit issued under the 2017 Credit Facility are subject to a letter of credit fee of 1.25% to 2.00% (under the 2016 Credit Facility, the letter of credit fee was from 1.00% to 2.00%), and performance standby letters of credit are subject to a letter of credit fee of 0.50% to 1.00% under the Credit Facility.The Company must also pay a commitment fee to the lenders of 0.20% to 0.40% on any unused availability under the Credit Facility. In each of the foregoing cases, the applicable margin or fee is based on the Company’s Consolidated Leverage Ratio, as defined in the Credit Facility, as of the then most recent fiscal quarter.

As of September 30, 2017 and December 31, 2016, outstanding revolving loans, which included $171 million and $119 million, respectively, of borrowings denominated in foreign currencies, accrued interest at weighted average rates of approximately 2.96% and 3.71% per annum, respectively. The term loan accrued interest at a rate of 2.86% and 2.77% as of September 30, 2017 and December 31, 2016, respectively. Letters of credit of approximately $189.1 million and $314.3 million were issued as of September 30, 2017 and December 31, 2016, respectively. As of September 30, 2017 and December 31, 2016, letters of credit fees accrued at 0.750% and 1.00% per annum, respectively, for performance standby letters of credit, and at 1.625% and 2.00% 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, 2017 and December 31, 2016, availability for revolving loans totaled $610.3 million and $405.9 million, respectively, or up to $460.9 million and $335.7 million, respectively, for new letters of credit. Revolving loan borrowing capacity included $129.4 million and $80.9 million of availability in either Canadian dollars or Mexican pesos as of September 30, 2017 and December 31, 2016, respectively. The unused facility fee as of September 30, 2017 and December 31, 2016 accrued at a rate of 0.30% and 0.40%, respectively.

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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 requires that the Company maintain a Maximum Consolidated Leverage Ratio, as defined in the Credit Facility, of 3.50 (subject to the Acquisition Adjustment described below). The Credit Facility also requires that the Company maintain a Minimum Consolidated Interest Coverage Ratio, as defined in the Credit Facility, of 3.00. The Credit Facility provides that, for purposes of calculating the Consolidated Leverage Ratio, certain cash charges may be added back to the calculation of Consolidated EBITDA, as defined in the Credit Facility, and funded indebtedness excludes undrawn standby performance letters of credit. Additionally, notwithstanding the terms discussed above, subject to certain conditions, if a permitted acquisition or series of permitted acquisitions having consideration exceeding $50 million occurs during a fiscal quarter, the Consolidated Leverage Ratio may be temporarily increased to up to 3.75 during such fiscal quarter and the subsequent two fiscal quarters. Such right may be exercised no more than two times during the term of the Credit Facility. Subject to customary exceptions, the Credit Facility limits the borrowers’ and the Guarantor Subsidiaries’ ability to engage in certain activities, including acquisitions, mergers and consolidations, debt incurrence, investments, capital expenditures, asset sales, debt prepayments, lien incurrence and the making of distributions or repurchases of capital stock. However, distributions payable solely in capital stock are permitted. The Credit Facility provides for customary events of default and carries cross-default provisions with the Company’s other significant debt instruments, including the Company’s indemnity agreement with its surety provider, as well as customary remedies, including the acceleration of repayment of outstanding amounts and other remedies with respect to the collateral securing the Credit Facility obligations.

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 denominated in Canadian dollars. As September 30, 2017 and December 31, 2016, maximum borrowing capacity totaled Canadian $20.0 million and $40.0 million, respectively, or approximately $16.0 million and $29.8 million, respectively. As of September 30, 2017 and December 31, 2016, outstanding borrowings totaled approximately $5.4 million and $13.4 million, respectively, and accrued interest at a weighted average rate of approximately 4.0% and 3.6%, respectively. Outstanding borrowings that are not renewed are repaid with borrowings under the Company’s senior secured credit facility. Accordingly, the carrying amounts of the Company’s borrowings under its other credit facilities, which are included within notes payable and other debt obligations in the table above, 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.

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 Company’s Credit Facility or other outstanding indebtedness. See Note 16 - Supplemental Guarantor Condensed Unaudited Consolidating Financial Information.

MasTec was in compliance with the provisions and covenants of its outstanding debt instruments as of September 30, 2017 and December 31, 2016.

Additional Information

As of September 30, 2017 and December 31, 2016, accrued interest payable, which is recorded within other accrued expenses in the consolidated balance sheets, totaled $4.1 million and $8.5 million, respectively. Additionally, in connection with the 2017 Credit Facility amendment, the Company paid approximately $6 million in financing costs for the nine month period ended September 30, 2017. For additional information pertaining to the Company’s debt instruments, including its 4.875% Senior Notes, see Note 7 - Debt in the Company’s 2016 Form 10-K.

Note 8 - Lease Obligations

Capital Leases

MasTec enters into agreements that provide lease financing for machinery and equipment. The gross amount of assets held under capital leases as of September 30, 2017 and December 31, 2016, which are included within property and equipment, net, totaled $404.1 million and $294.9 million, respectively. Assets held under capital leases, net of accumulated depreciation, totaled $269.6 million and $177.5 million as of September 30, 2017 and December 31, 2016, 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. See Note 15 - Related Party Transactions. Rent and related expense for operating leases that have non-cancelable terms in excess of one year totaled approximately $25.4 million and $25.9 million for the three month periods ended September 30, 2017 and 2016, respectively, and totaled $77.6 million and $74.8 million for the nine month periods ended September 30, 2017 and 2016, respectively. The Company also incurred rent and related expense for facilities, vehicles and equipment having original terms of one year or less totaling approximately $159.4 million and $96.7 million for the three month periods ended September 30, 2017 and 2016, respectively, and totaling $347.8 million and $213.9 million for the nine month periods ended September 30, 2017 and 2016, respectively.

Note 9 – Stock-Based Compensation and Other Employee Benefit Plans

The Company has stock-based compensation plans, under which shares of the Company’s common stock are reserved for issuance. Under all stock-based compensation plans in effect as of September 30, 2017, including employee stock purchase plans, there were approximately 4.9 million

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shares available for future grant. In March 2017, the Company’s board of directors adopted the Amended and Restated 2013 Incentive Compensation Plan (the “Amended 2013 ICP”), which was effective as of January 1, 2017 and changed the amount of tax the Company can withhold for employee tax withholdings on share-based awards, as provided under ASU 2016-09. The Company adopted ASU 2016-09 as of January 1, 2017, as discussed in Note 1 - Business, Basis of Presentation and Significant Accounting Policies.

Restricted Shares

MasTec grants restricted stock awards and restricted stock units (together “restricted shares”), which are valued based on the closing market share price of MasTec common stock (the “market price”) 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, 2017was approximately$15.8 million, which is expected to be recognized over a weighted average period of approximately1.1years. The intrinsic value of restricted shares that vested, which is based on the market price on the date of vesting, totaled $0.1 million for both the three month periods ended September 30, 2017 and 2016, and totaled $11.9 million and $1.5 million for the nine month periods ended September 30, 2017 and 2016, respectively.

Activity, restricted shares: (a)	Restricted Shares		Per Share Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2016	1,970,586		$	21.61
Granted	193,348		39.47
Vested	(304,211	)	40.72
Canceled/forfeited	(30,041	)	20.24
Non-vested restricted shares, as of September 30, 2017	1,829,682		$	20.34

(a) Includes 39,050 and 43,300 restricted stock units as of September 30, 2017 and December 31, 2016, respectively.

Stock Options

The Company previously granted options to purchase its common stock to employees and members of the Board of Directors and affiliates under various stock option plans. During 2016, all stock options that were outstanding under previous stock option grants were exercised. The intrinsic value of options exercised, which is based on the difference between the exercise price and the market share price of the Company’s common stock on the date of exercise, totaled $0.5 million and $1.8 million for the three and nine month periods ended September 30, 2016, respectively. Net of shares withheld in cashless option exercises, there were no proceeds from option exercises for the three month period ended September 30, 2016, and for the nine month period ended September 30, 2016, proceeds totaled $1.9 million.

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
	2017		2016
Cash proceeds (in millions)	$	2.4	$	2.0
Common shares issued	68,789		115,556
Weighted average price per share	$	34.72	$	16.88
Weighted average per share grant date fair value	$	9.00	$	4.58

Non-CashStock-Based Compensation Expense

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

	For the Three Months Ended September 30				For the Nine Months Ended September 30
	2017		2016		2017		2016
Non-cash stock-based compensation expense	$	3.4	$	3.9	$	10.5	$	11.3
Income Tax Effects:
Income tax effect of non-cash stock-based compensation	$	1.3	$	1.7	$	3.8	$	5.6
Excess tax benefit from non-cash stock-based compensation (a)	$	0.0	$	0.3	$	0.1	$	1.4

(a) Excess tax benefits represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with share-based payment arrangements. For the ninemonth period ended September 30, 2017, the Company incurred a net tax deficiency of $0.1 million related to the vesting of share-based payment awards and excess tax benefits were de minimis. As discussed in Note 1 - Business, Basis of Presentation and Significant Accounting Policies, the Company adopted

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ASU 2016-09 effective January 1, 2017 on a prospective basis. ASU 2016-09 changed the required presentation of excess tax benefits in the consolidated statement of cash flows from financing activities to operating activities. Excess tax benefits for the comparative prior year period are classified as cash flows from financing activities.

Note 10 – Other Retirement Plans

Multiemployer Plans. Certain of MasTec’s subsidiaries, including certain subsidiaries in Canada, contribute amounts to multiemployer pension and other multiemployer 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. Multiemployer 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 a 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 multiemployer 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:

	Multiemployer Plans
	Covered Employees		Contributions (in millions)
	Low	High	Pension		Other Multiemployer		Total
For the Three Months Ended September 30:
2017	3,669	7,057	$	36.7	$	2.7	$	39.4
2016	4,170	4,910	$	26.4	$	2.9	$	29.3
For the Nine Months Ended September 30:
2017	550	7,057	$	68.1	$	8.0	$	76.1
2016	1,112	4,910	$	43.4	$	7.6	$	51.0

The fluctuations in the average number of employees covered under multiemployer plans and related contributions in the table above are primarily related to higher levels of union resource-based project activity within the Company’s oil and gas operations.

Note 11 – Equity

Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss is composed of unrealized foreign currency translation gains and losses, which 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, and unrealized gains and losses from certain investment activities. For both the three and nine month periods ended September 30, 2017 and 2016, unrealized foreign currency activity related primarily to the Company’s Canadian operations, and unrealized investment activity related to interest rate swaps associated with the Waha JVs.

Share Activity

No shares of the Company’s common stock have been repurchased under the Company’s 2016 share repurchase program.

Note 12 - 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 three month period ended September 30, 2017, the Company recognized certain tax credits based upon the results of a study that is currently underway, which amount was determined based on management’s estimates and currently available information. Further adjustments to the amount recognized may occur as the results of the study are finalized, which is expected to occur in the fourth quarter of 2017.

As discussed in Note 1 - Business, Basis of Presentation and Significant Accounting Policies, effective January 1, 2017, the Company adopted ASU 2016-09, which changed the recognition requirements for excess tax benefits (“windfalls”) or tax deficiencies (“shortfalls”) from share-based payment awards. ASU 2016-09 requires windfalls or shortfalls to be recognized within income tax expense in the interim periods in which they occur, rather than as additional paid-in capital. Given that windfalls or shortfalls are recognized in income tax expense in the periods in which they occur, they are not included when estimating annual effective tax rates. The tax effect related to the vesting of share-based payment awards did not have a significant effect on the Company’s consolidated effective tax rate for the three and nine month periods ended September 30, 2017.

As of September 30, 2017, the Company had $274.5 million of long-term deferred tax liabilities. As of December 31, 2016, current deferred tax assets, net, totaled $11.8 million and long-term deferred tax liabilities, net, totaled $178.4 million. In addition, as of September 30, 2017 and December 31, 2016, accrued income and other taxes payable, which are included within other accrued expenses, totaled $19.8 million and $40.3 million, respectively. The Company adopted Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes (“ASU 2015-17”), which changed the classification requirements for deferred tax assets and liabilities, effective January 1, 2017. ASU 2015-17 requires long-term classification of all deferred

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tax assets and liabilities, rather than separately classifying deferred tax assets and liabilities based on their net current and non-current amounts, as was required under the previous guidance. The Company adopted ASU 2015-17 on a prospective basis, therefore prior periods were not adjusted to conform to the current period presentation. The adoption of ASU 2015-17 did not have had a material effect on the consolidated financial statements.

Note 13 - Segments and Related Information

Segment Discussion

MasTec manages its 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.

The Communications segment performs engineering, construction, maintenance and customer fulfillment activities related to communications infrastructure primarily for wireless and wireline/fiber communications and install-to-the-home customers, and, to a lesser extent, infrastructure for utilities, among others.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/biofuel facilities and various types of heavy civil and industrial infrastructure.The Other segment includes equity investees, the services of which vary from those provided by the Company’s four primary segments, as well as other small business units that perform construction and other services for a variety of international end-markets.

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 understand the Company’s financial results and assess its prospects for future performance. The Company uses EBITDA to evaluate its performance, both internally and as compared with its peers, because it excludes certain items that may not be indicative of the Company’s core operating results for its reportable segments, as well as items that can vary widely across different industries or among companies within the same industry, and for non-cash stock-based compensation expense, can also be subject to volatility from changes in the market price per share of our common stock or variations in the value of shares granted. Segment EBITDA is calculated in a manner consistent with consolidated EBITDA.

For the three and nine month periods ended September 30, 2017, Other segment EBITDA included project losses of $0.4 million and $7.4 million, respectively, from a proportionately consolidated non-controlled Canadian joint venture, which is managed by a third party, and for which we have minimal direct construction involvement. For both the three and nine month periods ended September 30, 2016, Other segment EBITDA included $5.1 million of project losses on this proportionately consolidated non-controlled Canadian joint venture. For the nine month period ended September 30, 2016, EBITDA for the Oil and Gas and Electrical Transmission segments included first quarter project losses of $13.5 million and $15.1 million, respectively.

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
Revenue:	2017			2016			2017			2016
Communications (a)	$	610.5		$	624.3		$	1,762.2		$	1,728.0
Oil and Gas	1,161.0			736.0			2,757.2			1,454.3
Electrical Transmission	81.8			101.7			277.3			283.6
Power Generation and Industrial	96.9			123.6			204.1			324.7
Other	10.6			7.6			14.2			14.9
Eliminations	(5.0		)	(7.0		)	(10.9		)	(12.7		)
Consolidated revenue	$	1,955.8		$	1,586.2		$	5,004.1		$	3,792.8

(a) Revenue generated primarily by utilities customers represented 13.0% and 11.1% of Communications segment revenue for the three month periods ended September 30, 2017 and 2016, respectively, and represented 12.6% and 10.9% for the nine month periods ended September 30, 2017 and 2016, respectively.

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	For the Three Months Ended September 30						For the Nine Months Ended September 30
EBITDA:	2017			2016			2017			2016
Communications	$	65.3		$	62.8		$	173.2		$	190.9
Oil and Gas	108.1			117.8			356.1			187.6
Electrical Transmission	4.5			(8.3		)	11.2			(42.0		)
Power Generation and Industrial	9.3			6.1			14.8			13.8
Other	10.1			(3.1		)	11.6			(2.6		)
Corporate	(22.0		)	(24.3		)	(69.2		)	(55.1		)
Consolidated EBITDA	$	175.3		$	151.0		$	497.7		$	292.6

	For the Three Months Ended September 30				For the Nine Months Ended September 30
Depreciation and Amortization:	2017		2016		2017		2016
Communications	$	13.8	$	12.5	$	39.4	$	37.2
Oil and Gas	26.0		20.7		71.1		58.2
Electrical Transmission	5.8		6.1		17.3		17.1
Power Generation and Industrial	2.9		1.6		5.8		4.6
Other	0.0		0.0		0.1		0.0
Corporate	1.6		1.7		4.7		5.1
Consolidated depreciation and amortization	$	50.1	$	42.6	$	138.4	$	122.2

The following table, which may contain slight summation differences due to rounding, presents a reconciliation of consolidated income before income taxes to EBITDA (in millions):

	For the Three Months Ended September 30				For the Nine Months Ended September 30
EBITDA Reconciliation:	2017		2016		2017		2016
Income before income taxes	$	107.6	$	95.3	$	314.3	$	132.4
Plus:
Interest expense, net	17.6		13.1		45.0		37.9
Depreciation and amortization	50.1		42.6		138.4		122.2
Consolidated EBITDA	$	175.3	$	151.0	$	497.7	$	292.6

Foreign Operations. MasTec operates in North America, primarily in the United States and Canada, and, to a lesser extent, in Mexico. For the three month periods ended September 30, 2017 and 2016, revenue of $1.9 billion and $1.5 billion, respectively, was derived from U.S. operations, and revenue of $61.0 million and $73.8 million, respectively, was derived from foreign operations, the majority of which was from the Company’s Canadian operations. For the nine month periods ended September 30, 2017 and 2016, revenue of $4.8 billion and $3.6 billion, respectively, was derived from U.S. operations, and revenue of $160.7 million and $222.8 million, respectively, was derived from foreign operations, the majority of which was from the Company’s Canadian operations. The majority of the Company’s foreign operations during the three and nine month periods ended September 30, 2017 and 2016 were in the Company’s Oil and Gas segment. Long-lived assets held in the U.S. included property and equipment, net, of $629.2 million and $475.3 million as of September 30, 2017 and December 31, 2016, respectively, and, for the Company’s businesses in foreign countries, the majority of which are in Canada, totaled $62.2 million and $73.8 million, respectively. Intangible assets and goodwill, net, related to the Company’s U.S. operations totaled approximately $1.2 billion and $1.1 billion as of September 30, 2017 and December 31, 2016, respectively, and, for the Company’s businesses in foreign countries, the majority of which are in Canada, totaled approximately $114.3 million and $107.8 million as of September 30, 2017 and December 31, 2016, respectively. Amounts due from customers from which foreign revenue was derived accounted for approximately 6% and 8%, respectively, of the Company’s consolidated net accounts receivable position as of September 30, 2017 and December 31, 2016, which represents accounts receivable, net, less BIEC.

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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
Customer:	2017	2016	2017	2016
Energy Transfer affiliates (a)	49%	35%	40%	26%
AT&T (including DIRECTV®) (b)	21%	30%	25%	34%

(a) The Company's relationship with Energy Transfer affiliates is based upon various construction contracts for pipeline activities with Energy Transfer Partners L.P., and their subsidiaries and affiliates, all of which are consolidated by Energy Transfer Equity, L.P. Revenue from Energy Transfer affiliates is included in the Oil and Gas segment.

(b) The Company’s relationship with AT&T is based upon multiple separate master service and other service agreements, including for installation and maintenance services, as well as construction/installation contracts for AT&T’s: (i) wireless business; (ii) wireline/fiber businesses; and (iii) various install-to-the-home businesses, including DIRECTV®. Revenue from AT&T is included in the Communications segment.

Note 14 - Commitments and Contingencies

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. See Note 14 - Commitments and Contingencies in the Company’s 2016 Form 10-K for additional information. 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 the Company. The outcome of such cases, claims and disputes 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.

Other Commitments and Contingencies

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 8 - Lease Obligations and Note 15 - Related Party Transactions.

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 as well as certain obligations associated with the Company’s cost and equity investees, including its variable interest entities. 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, 2017 and December 31, 2016, there were $189.1 million and $314.3 million, respectively, of letters of credit issued under the Company’s Credit Facility. The Company is not aware of material claims relating to its outstanding letters of credit as of September 30, 2017 or December 31, 2016.

Performance and Payment Bonds. In the ordinary course of business, MasTec is required by certain customers to provide performance and payment bonds for 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, 2017 and December 31, 2016, outstanding performance and payment bonds totaled $119.2 million and $72.9 million, respectively, and estimated costs to complete projects secured by these bonds totaled $51.3 million and $9.5 million as of September 30, 2017 and December 31, 2016, respectively. These amounts do not include performance and payment bonds associated with the Company’s equity investees.

Cost and Equity Investees and Other Entities. The Company holds a 35% undivided interest in a proportionately consolidated non-controlled Canadian contractual joint venture that was underway when the Company acquired Pacer in 2014, whose sole activity involves the construction of a bridge, a business in which the Company does not otherwise engage. This joint venture, which is managed by a third party, and for which the Company has minimal direct construction involvement, automatically terminates upon completion of the project. The Company also holds undivided interests, ranging from 85% to 90% in seven proportionately consolidated non-controlled contractual joint ventures that provide infrastructure construction services for electrical transmission projects. Income and/or losses incurred by these joint ventures are generally shared proportionally by the respective joint venture members, with the members of the joint ventures jointly and severally liable for all of the obligations of the joint venture. The respective joint venture agreements provide 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 partners fail or refuse to pay or perform their respective share of the obligations. As of September 30, 2017, the Company was not aware of circumstances that would reasonably lead to material future claims against it in connection with these arrangements.

The Company has other investment arrangements, as discussed in Note 4 - Fair Value of Financial Instruments and Note 15 - Related Party Transactions. From time to time, the Company may incur costs or provide financing, performance, financial and/or other guarantees to or in connection with its investees.

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, 2017 and December 31, 2016, MasTec’s liability for unpaid claims and associated expenses, including incurred but not reported losses related to these policies, totaled $98.5 million and $85.8 million, respectively, of which $67.5 million and $55.2 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 totaled $2.6 million as of both September 30, 2017 and December 31, 2016.

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 $84.6 million and $85.1 million as of September 30, 2017 and December 31, 2016, respectively. In addition, cash collateral deposited with insurance carriers, which is included within other long-term assets, amounted to $1.5 million for these policies as of both September 30, 2017 and December 31, 2016. Outstanding surety bonds related to workers’ compensation self-insurance programs amounted to $13.7 million and $13.5 million as of September 30, 2017 and December 31, 2016, respectively.

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 Multiemployer Plans. As discussed in Note 10 - Other Retirement Plans, certain of MasTec’s subsidiaries are party to various collective bargaining agreements with unions representing certain of their employees, which require the Company to pay specified wages, provide certain benefits to their union employees and contribute certain amounts to multiemployer pension and other multiemployer benefits plans and trusts. The Employee Retirement Income Security Act of 1974, as amended by the Multiemployer Pension Plan Amendments Act of 1980 (collectively, “ERISA”), which governs U.S.-registered multiemployer 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. 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. As described in the Company’s 2016 Form 10-K, the Company, along with other members of the Pipe Line Contractors Association (the “PLCA”), voluntarily withdrew from the Central States Southeast and Southwest Areas Pension Fund (“Central States”) in November 2011, for which the Company established and paid a $6.4 million withdrawal liability. The Company is in arbitration to determine if there is any remaining amount owed on this withdrawal liability, and during the third quarter of 2017, the Company recognized $0.6 million of expense in connection with the expected settlement of this matter.

Other than the Company’s 2011 withdrawal from Central States and certain other underfunded plans, as described in the Company’s 2016 Form 10-K, the Company does not have plans to withdraw from, and is not aware of circumstances that would reasonably lead to material claims against it in connection with these plans. However, there can be no assurance that the Company will not be assessed liabilities in the future.

Based upon the information available to the Company from plan administrators as of September 30, 2017, several of the multiemployer pension plans in which it participates are underfunded and, as a result, the Company could be required to increase its contributions, including in the form of a surcharge on future benefit contributions. 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 these plans, investment returns and the level of underfunding of such plans.

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, 2017 and December 31, 2016, the Company was not aware of any 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 certain of its equity investees. MasTec also generally warrants the work it performs for a one to two year period following substantial completion of a project. Much of the work performed by the Company is evaluated for defects shortly after the work is completed. Accrued warranty claims are, and historically have been, de minimis. However, if warranty claims occur, the Company could be required to repair or replace warrantied items, or, if customers elect to repair or replace the warrantied item using the services of another provider, the Company could be required to pay for the cost of the repair or replacement.

Concentrations of Risk. The Company had approximately 455 customers for the nine month period ended September 30, 2017. As of September 30, 2017 and December 31, 2016, one customer accounted for approximately 44% and 24%, respectively, of the Company’s consolidated net accounts receivable position, which represents accounts receivable, net, less BIEC. As of September 30, 2017 and December 31, 2016, a separate customer accounted for approximately 13% and 17%, respectively, of the Company’s consolidated net accounts receivable position. In addition, the Company derived 83% and 80%, respectively, of its revenue from its top ten customers for the three month periods ended September 30, 2017 and 2016, and derived 80% and 76% of its revenues, respectively, from its top ten customers for the nine month periods ended September 30, 2017 and 2016.

Note 15 - Related Party Transactions

For the three month periods ended September 30, 2017 and 2016, revenue recognized by the Company’s Pacer subsidiary for work performed for a contractual joint venture in which it holds a 35% undivided interest totaled $0.6 million and $0.2 million, respectively, and for the nine month periods ended September 30, 2017 and 2016, totaled $0.9 million and $0.8 million, respectively. As of September 30, 2017 and December 31, 2016, receivables from this contractual joint venture totaled $0.9 million and $0.7 million, respectively. Related performance guarantees, which are based on the original full contract value, as of both September 30, 2017 and December 31, 2016, totaled Canadian $132.1 million (or approximately $105.9 million and $98.3 million, respectively). In connection with this contractual joint venture, the Company provided project-related financing of $2.7 million and $5.9 million, respectively, for the three and nine month periods ended September 30, 2017, and $0.8 million and $5.6 million, respectively, for the three and nine month periods ended September 30, 2016. As of September 30, 2017, there were no additional amounts committed to this entity.

22

In connection with an April 2017 acquisition, the Company acquired a 40% interest in an entity, valued at $0.4 million, which is accounted for as an equity method investment. The Company has a subcontracting arrangement with this entity. For the nine month period ended September 30, 2017, the Company incurred $0.2 million of expenses under this subcontracting arrangement, and there were no amounts outstanding as of September 30, 2017. During the nine month period ended September 30, 2017, the Company advanced $0.3 million to this entity, net, of which $0.3 million was outstanding as of September 30, 2017. The acquired company had a vendor financing arrangement with an entity that was owned by a member of subsidiary management, which arrangement was completed in the third quarter of 2017. The payments made under this arrangement for the three and nine month periods ended September 30, 2017 totaled $1.4 million and $5.3 million, respectively, and no amounts were outstanding as of September 30, 2017.

MasTec purchases, rents and leases equipment used in its business from a number of different vendors on a non-exclusive basis, including CCI, in which the Company has a cost method investment. Juan Carlos Mas, who is the brother of Jorge Mas, Chairman of MasTec’s Board of Directors, and José R. Mas, serves as the chairman of CCI. For the three month periods ended September 30, 2017 and 2016, MasTec paid CCI approximately $22.9 million and $10.0 million, respectively, for equipment supplies, rentals, leases and servicing. For the nine month periods ended September 30, 2017 and 2016, MasTec paid CCI approximately $34.9 million and $13.7 million, respectively, net of rebates. As of September 30, 2017 and December 31, 2016, related payables totaled approximately $6.1 million and $1.5 million, respectively.

MasTec has a subcontracting arrangement with an entity for the performance of construction services, the minority owners of which include an entity controlled by Jorge Mas and José R. Mas, along with two members of management of a MasTec subsidiary. For the three month periods ended September 30, 2017 and 2016, MasTec incurred $39.2 million and $5.6 million, respectively, of expenses under this subcontracting arrangement, and for the nine month periods ended September 30, 2017 and 2016, MasTec incurred $54.8 million and $8.8 million, respectively. During the third quarter of 2016, the Company sold equipment totaling $0.3 million to this entity. As of September 30, 2017 and December 31, 2016, related amounts payable totaled $20.1 million and $0.1 million, respectively.

MasTec leases employees to a customer in which Jorge Mas and José R. Mas own a majority interest. For both three month periods ended September 30, 2017 and 2016, MasTec charged approximately $0.2 million to this customer, and for both the nine month periods ended September 30, 2017 and 2016, charged $0.6 million. As of both September 30, 2017 and December 31, 2016, outstanding receivables from employee leasing arrangements with this customer totaled $0.2 million. The Company also provides satellite communication services to this customer. For both the three month periods ended September 30, 2017 and 2016, revenue from satellite communication services provided to this customer totaled approximately $0.2 million, and for the nine month periods ended September 30, 2017 and 2016, satellite communication revenues totaled $0.6 million and $0.7 million, respectively. As of September 30, 2017 and December 31, 2016, receivables from this arrangement totaled approximately $0.3 million and $0.4 million, respectively.

MasTec has a leasing arrangement with an independent third party that leases an aircraft from a Company owned by Jorge Mas. For the three month periods ended September 30, 2017 and 2016, MasTec paid $0.5 million and $0.7 million, respectively, under this leasing arrangement, and for the nine month periods ended September 30, 2017 and 2016, MasTec paid $1.5 million and $2.0 million, respectively. As of both September 30, 2017 and December 31, 2016, related amounts payable were de minimis.

For the three month periods ended September 30, 2017 and 2016, related party lease payments for operational facilities and equipment, which are primarily associated with members of subsidiary management, totaled approximately $11.3 million and $12.5 million, respectively, and for the nine month periods ended September 30, 2017 and 2016, related party lease payments totaled approximately $38.4 million and $31.6 million, respectively. Payables associated with related party leases totaled approximately $0.6 million and $0.3 million as of September 30, 2017 and December 31, 2016, respectively. Additionally, payments for various types of supplies and services, including ancillary construction services, project-related site restoration and marketing and business development activities associated with members of subsidiary management totaled approximately $26.4 million and $7.4 million for the three month periods ended September 30, 2017 and 2016, respectively, and totaled $41.0 million and $14.2 million for the nine month periods ended September 30, 2017 and 2016, respectively. As of September 30, 2017 and December 31, 2016, associated amounts payable totaled approximately $0.8 million and $3.7 million, respectively. In addition, MasTec performs construction services for an entity associated with a member of subsidiary management. Revenue from this arrangement totaled $1.0 million for the three month period ended September 30, 2017, and related receivables totaled $0.5 million as of September 30, 2017. The oil and gas pipeline equipment company that was acquired by MasTec in the third quarter of 2017 was formerly owned by a member of subsidiary management. MasTec previously leased equipment from this company. The Company paid $40.6 million in cash and $57.3 million of contingent consideration in connection with this acquisition.

Non-controlling interests in entities consolidated by the Company represent ownership interests held by certain members of management of several of the Company’s subsidiaries, primarily in our Oil and Gas segment, and the Company has a subcontracting arrangement with one of these entities for the performance of ancillary oil and gas construction services, which transactions are eliminated in consolidation. The Company made distributions of earnings of $1.3 million in the first quarter of 2017 to holders of its non-controlling interests.

Split Dollar Agreements

MasTec has split dollar life insurance agreements with each of José R. Mas and Jorge Mas. In connection with the split dollar agreement for José R. Mas, the Company made no payments in either of the three month periods ended September 30, 2017 and 2016, and paid $0.7 million in each of the nine month periods ended September 30, 2017 and 2016. In connection with the split dollar agreement for Jorge Mas, the Company paid $0.6 million for both the three month periods ended September 30, 2017 and 2016, and paid $1.1 million for both the nine month periods ended September 30, 2017 and 2016. As of September 30, 2017 and December 31, 2016, life insurance assets associated with these agreements totaled $16.6 million and $14.8 million, respectively, which amount is included within other long-term assets.

23

Note 16 – Supplemental Guarantor Condensed Unaudited Consolidating Financial Information

The 4.875% Senior Notes 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 (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 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 (loss) and cash flows for 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.

24

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

For the Three Months Ended September 30, 2017	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	1,860.3		$	130.3		$	(34.8	)	$	1,955.8
Costs of revenue, excluding depreciation and amortization	—			1,640.3			120.7			(34.8		)	1,726.2
Depreciation and amortization	—			41.1			9.0			—			50.1
General and administrative expenses	0.5			61.7			4.2			—			66.4
Interest expense (income), net	—			33.2			(15.6		)	—			17.6
Equity in earnings of unconsolidated affiliates	—			—			(7.4		)	—			(7.4		)
Other income, net	—			(4.6		)	(0.1		)	—			(4.7		)
(Loss) income before income taxes	$	(0.5	)	$	88.6		$	19.5		$	—		$	107.6
Benefit from (provision for) income taxes	0.2			(33.8		)	(9.9		)	—			(43.4		)
Net (loss) income before equity in income from subsidiaries	$	(0.3	)	$	54.8		$	9.6		$	—		$	64.2
Equity in income from subsidiaries, net of tax	64.1			—			—			(64.1		)	—
Net income (loss)	$	63.8		$	54.8		$	9.6		$	(64.1	)	$	64.2
Net income attributable to non-controlling interests	—			—			0.4			—			0.4
Net income (loss) attributable to MasTec, Inc.	$	63.8		$	54.8		$	9.2		$	(64.1	)	$	63.8
Comprehensive income (loss)	$	65.2		$	54.9		$	11.1		$	(65.5	)	$	65.7

For the Three Months Ended September 30, 2016	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	1,493.9		$	112.7		$	(20.4	)	$	1,586.2
Costs of revenue, excluding depreciation and amortization	—			1,282.3			107.2			(20.4		)	1,369.0
Depreciation and amortization	—			33.7			8.9			—			42.6
General and administrative expenses	0.6			60.6			5.9			—			67.1
Interest expense (income), net	—			28.6			(15.5		)	—			13.1
Equity in losses of unconsolidated affiliates	—			—			—			—			—
Other (income) expense, net	—			(3.4		)	2.3			—			(1.0		)
(Loss) income before income taxes	$	(0.6	)	$	92.1		$	3.9		$	—		$	95.3
Benefit from (provision for) income taxes	0.2			(33.4		)	(5.6		)	—			(38.8		)
Net (loss) income before equity in income from subsidiaries	$	(0.4	)	$	58.7		$	(1.7	)	$	—		$	56.5
Equity in income from subsidiaries, net of tax	56.7			—			—			(56.7		)	—
Net income (loss)	$	56.3		$	58.7		$	(1.7	)	$	(56.7	)	$	56.5
Net income attributable to non-controlling interests	—			—			0.3			—			0.3
Net income (loss) attributable to MasTec, Inc.	$	56.3		$	58.7		$	(2.0	)	$	(56.7	)	$	56.3
Comprehensive income (loss)	$	54.5		$	58.7		$	(3.6	)	$	(54.9	)	$	54.7

25

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

For the Nine Months Ended September 30, 2017	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	4,763.4		$	347.4		$	(106.7	)	$	5,004.1
Costs of revenue, excluding depreciation and amortization	—			4,097.7			332.6			(106.7		)	4,323.6
Depreciation and amortization	—			112.2			26.2			—			138.4
General and administrative expenses	1.7			187.7			12.6			—			202.0
Interest expense (income), net	—			91.5			(46.5		)	—			45.0
Equity in earnings of unconsolidated affiliates	—			—			(15.1		)	—			(15.1		)
Other (income) expense, net	—			(9.9		)	5.8			—			(4.1		)
(Loss) income before income taxes	$	(1.7	)	$	284.2		$	31.8		$	—		$	314.3
Benefit from (provision for) income taxes	0.6			(104.9		)	(21.9		)	—			(126.2		)
Net (loss) income before equity in income from subsidiaries	$	(1.1	)	$	179.3		$	9.9		$	—		$	188.2
Equity in income from subsidiaries, net of tax	187.5			—			—			(187.5		)	—
Net income (loss)	$	186.4		$	179.3		$	9.9		$	(187.5	)	$	188.2
Net income attributable to non-controlling interests	—			—			1.8			—			1.8
Net income (loss) attributable to MasTec, Inc.	$	186.4		$	179.3		$	8.1		$	(187.5	)	$	186.4
Comprehensive income (loss)	$	187.5		$	179.3		$	11.1		$	(188.6	)	$	189.3

For the Nine Months Ended September 30, 2016	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	3,521.5		$	302.2		$	(30.9	)	$	3,792.8
Costs of revenue, excluding depreciation and amortization	—			3,054.5			298.0			(30.9		)	3,321.6
Depreciation and amortization	—			96.6			25.6			—			122.2
General and administrative expenses	1.7			172.1			21.2			—			195.0
Interest expense (income), net	—			83.8			(45.9		)	—			37.9
Equity in earnings of unconsolidated affiliates	—			—			(3.5		)	—			(3.5		)
Other income, net	—			(12.7		)	(0.1		)	—			(12.8		)
(Loss) income before income taxes	$	(1.7	)	$	127.2		$	6.9		$	—		$	132.4
Benefit from (provision for) income taxes	0.6			(47.3		)	(7.6		)	—			(54.3		)
Net (loss) income before equity in income from subsidiaries	$	(1.1	)	$	79.9		$	(0.7	)	$	—		$	78.1
Equity in income from subsidiaries, net of tax	78.8			—			—			(78.8		)	—
Net income (loss)	$	77.7		$	79.9		$	(0.7	)	$	(78.8	)	$	78.1
Net income attributable to non-controlling interests	—			—			0.4			—			0.4
Net income (loss) attributable to MasTec, Inc.	$	77.7		$	79.9		$	(1.1	)	$	(78.8	)	$	77.7
Comprehensive income (loss)	$	69.2		$	79.9		$	(9.2	)	$	(70.3	)	$	69.6

26

CONDENSED UNAUDITED CONSOLIDATING BALANCE SHEETS (in millions)

As of September 30 2017	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Total current assets	$	—	$	1,576.0	$	259.8	$	(88.1	)	$	1,747.7
Property and equipment, net	—		600.8		90.6		—			691.4
Goodwill and other intangible assets, net	—		1,187.9		143.0		—			1,330.9
Investments in and advances to consolidated affiliates, net	1,279.7		848.0		710.2		(2,837.9		)	—
Other long-term assets	15.8		25.7		130.6		—			172.1
Total assets	$	1,295.5	$	4,238.4	$	1,334.2	$	(2,926.0	)	$	3,942.2
Liabilities and equity
Total current liabilities	$	—	$	982.5	$	107.7	$	(88.1	)	$	1,002.2
Long-term debt	—		1,181.1		11.2		—			1,192.3
Other long-term liabilities	—		432.0		12.7		—			444.7
Total liabilities	$	—	$	2,595.6	$	131.6	$	(88.1	)	$	2,639.1
Total equity	$	1,295.5	$	1,642.8	$	1,202.6	$	(2,837.9	)	$	1,303.0
Total liabilities and equity	$	1,295.5	$	4,238.4	$	1,334.2	$	(2,926.0	)	$	3,942.2

As of December 31, 2016	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Total current assets	$	—	$	1,256.3	$	175.8	$	(29.6	)	$	1,402.5
Property and equipment, net	—		456.6		92.5		—			549.1
Goodwill and other intangible assets, net	—		1,037.4		138.2		—			1,175.6
Investments in and advances to consolidated affiliates, net	1,083.9		625.9		861.2		(2,571.0		)	—
Other long-term assets	12.6		25.3		18.0		—			55.9
Total assets	$	1,096.5	$	3,401.5	$	1,285.7	$	(2,600.6	)	$	3,183.1
Liabilities and equity
Total current liabilities	$	—	$	759.7	$	109.9	$	(29.6	)	$	840.0
Long-term debt	—		938.7		22.7		—			961.4
Other long-term liabilities	—		256.2		21.9		—			278.1
Total liabilities	$	—	$	1,954.6	$	154.5	$	(29.6	)	$	2,079.5
Total equity	$	1,096.5	$	1,446.9	$	1,131.2	$	(2,571.0	)	$	1,103.6
Total liabilities and equity	$	1,096.5	$	3,401.5	$	1,285.7	$	(2,600.6	)	$	3,183.1

27

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF CASH FLOWS (in millions)

For the Nine Months Ended September 30, 2017	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash provided by (used in) operating activities	$	—		$	222.0		$	(43.4	)	$	—	$	178.6
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	—			(116.0		)	—			—		(116.0		)
Capital expenditures	—			(70.0		)	(13.3		)	—		(83.3		)
Proceeds from sale of property and equipment	—			12.5			1.1			—		13.6
Payments for other investments	—			(3.8		)	(73.3		)	—		(77.1		)
Proceeds from other investments	—			1.2			12.2			—		13.4
Net cash used in investing activities	$	—		$	(176.1	)	$	(73.3	)	$	—	$	(249.4	)
Cash flows from financing activities:
Proceeds from credit facilities	—			1,988.1			14.3			—		2,002.4
Repayments of credit facilities	—			(1,817.4		)	(23.0		)	—		(1,840.4		)
Repayments of other borrowings and capital lease obligations	—			(52.6		)	(8.3		)	—		(60.8		)
Payments of acquisition-related contingent consideration	—			(18.8		)	—			—		(18.8		)
Distributions to non-controlling interests	—			—			(1.3		)	—		(1.3		)
Proceeds from stock-based awards, net	0.9			—			—			—		0.9
Other financing activities, net	—			(6.3		)	—			—		(6.3		)
Net financing activities and advances (to) from consolidated affiliates	(0.9		)	(131.9		)	132.8			—		—
Net cash (used in) provided by financing activities	$	—		$	(38.9	)	$	114.5		$	—	$	75.6
Effect of currency translation on cash	—			—			0.2			—		0.2
Net increase (decrease) in cash and cash equivalents	$	—		$	7.0		$	(2.0	)	$	—	$	5.1
Cash and cash equivalents - beginning of period	$	—		$	28.3		$	10.5		$	—	$	38.8
Cash and cash equivalents - end of period	$	—		$	35.3		$	8.5		$	—	$	43.8

For the Nine Months Ended September 30, 2016	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash provided by operating activities	$	—		$	87.2		$	39.9		$	—	$	127.1
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	—			(4.1		)	—			—		(4.1		)
Capital expenditures	—			(84.0		)	(5.1		)	—		(89.1		)
Proceeds from sale of property and equipment	—			3.1			3.7			—		6.8
Payments for other investments	—			(3.8		)	(5.0		)	—		(8.9		)
Proceeds from other investments	—			—			1.1			—		1.1
Net cash used in investing activities	$	—		$	(88.8	)	$	(5.3	)	$	—	$	(94.1	)
Cash flows from financing activities:
Proceeds from credit facilities	—			1,093.8			93.0			—		1,186.8
Repayments of credit facilities	—			(1,056.1		)	(93.8		)	—		(1,149.9		)
Repayments of other borrowings and capital lease obligations	—			(37.6		)	(12.4		)	—		(50.0		)
Payments of acquisition-related contingent consideration	—			(16.5		)	(3.3		)	—		(19.8		)
Proceeds from stock-based awards, net	3.4			—			0.5			—		3.9
Other financing activities, net	1.4			—			—			—		1.4
Net financing activities and advances (to) from consolidated affiliates	(4.8		)	15.1			(10.3		)	—		—
Net cash used in financing activities	$	—		$	(1.3	)	$	(26.3	)	$	—	$	(27.6	)
Effect of currency translation on cash	—			—			(1.0		)	—		(1.0		)
Net (decrease) increase in cash and cash equivalents	$	—		$	(2.9	)	$	7.3		$	—	$	4.4
Cash and cash equivalents - beginning of period	$	—		$	4.7		$	0.3		$	—	$	5.0
Cash and cash equivalents - end of period	$	—		$	1.8		$	7.6		$	—	$	9.4

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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,” “forecasts,” “targets” 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 2016 Form 10-K, including those described under “Cautionary Statement Regarding Forward-Looking Statements” and “Risk Factors,” 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, 2017 and 2016. 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 our 2016 Form 10-K. In this MD&A, “$” means U.S. dollars unless specified otherwise.

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, install-to-the-home and customer fulfillment activities; petroleum and natural gas pipeline infrastructure; electrical utility transmission and distribution; conventional and renewable power generation; heavy civil and industrial infrastructure. Our customers are primarily in these industries. Including our predecessor companies, we have been in business for almost 90 years. We offer our services primarily under the MasTec service mark and, as of September 30, 2017, we had approximately 21,500 employees and 415 locations. We have been consistently ranked among the top specialty contractors by Engineering News-Record for the past several years.

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 and other 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 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. See Note 13 - Segments and Related Information and Note 14 - Commitments and Contingencies in the notes to the condensed unaudited consolidated financial statements, which are incorporated by reference, for segment related information as well as operating results by segment and 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 construction contracts, including new contracts under which work has not begun, as well as revenue from change orders and renewal options. Our estimated backlog also includes amounts under master service and other service agreements and includes our proportionate share of estimated revenue from proportionately consolidated non-controlled joint ventures. Estimated backlog for work under master service and other service agreements is determined based on historical trends, anticipated seasonal impacts, experience from similar projects and estimates of customer demand based on communications with our customers. We expect to realize approximately 25% of our September 30, 2017 estimated backlog in 2017. The following table presents 18-month backlog by reportable segment, as of the dates indicated:

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Reportable Segment (in millions):	September 30, 2017		June 30, 2017		September 30, 2016
Communications	$	3,505	$	3,375	$	3,125
Oil and Gas	907		1,506		1,134
Electrical Transmission	268		295		269
Power Generation and Industrial	331		85		116
Other	3		4		7
Estimated 18-month backlog	$	5,014	$	5,265	$	4,651

Approximately 65% of our backlog as of September 30, 2017 is attributable to amounts under master service or other service agreements, pursuant to which our customers are not contractually committed to purchase a minimum amount of services. Most of these agreements can be canceled on short or no advance notice. Timing of revenue for construction and installation projects included in our backlog can be subject to change as a result of customer delays, regulatory factors and/or other project-related factors. These changes could cause estimated revenue to be realized in periods later than originally expected, or not at all. In the past, we have occasionally experienced postponements, cancellations and reductions in expected future work from master service agreements due to changes in our customers’ spending plans, as well as on construction projects due to market volatility and regulatory factors. There can be no assurance as to our customers’ requirements or the accuracy of our estimates. As a result, our backlog as of any particular date is an uncertain indicator of future revenue and earnings.

Subsequent to September 30, 2017, we were granted a large pipeline construction project award with an expected contract value of over $1.5 billion, which is expected to be reflected in backlog at year-end 2017.

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, however, 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, on pipeline and power generation construction services. These fluctuations, as well as the highly competitive nature of our industry, can result, and in the past, have 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, regulatory and industry factors, such as (i) changes to our customers’ capital spending plans; (ii) mergers and acquisitions among the customers we serve; (iii) access to capital for customers in the industries we serve; (iv) new or changing regulatory requirements or other governmental policy uncertainty; (v) economic, market or political developments; and (vi) changes in technology, tax and other incentives could also increase or reduce demand for our services. While we actively monitor economic, industry and market factors that could affect our business, we cannot predict the effect that changes in such factors may have on our future results of operations, liquidity and cash flows, and we may be unable to fully mitigate, or benefit from, such changes.

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, including warm winter weather, excessive rainfall or natural catastrophes such as hurricanes or other severe 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 and other 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, political and market conditions; regulatory or environmental influences; and acquisitions, dispositions or strategic investments/other arrangements can also materially affect quarterly results in a given period. 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 our 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.

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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 our operating results, including the results of percentage-of-completion projects, and 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 2016 Form 10-K for discussion of our significant accounting policies. During the third quarter of 2017, we performed a quantitative assessment of the goodwill and an indefinite-lived pre-qualification intangible asset associated with certain of our operating segments in conjunction with our quarterly review of reporting units for indicators of impairment. Based on the results of these assessments, we determined that the estimated fair value of our Electrical Transmission operating segment exceeded its carrying value by approximately 10%, and that the fair values of two of our reporting units and the indefinite-lived pre-qualification intangible asset in our Oil and Gas segment, for which the carrying values totaled approximately $130 million, exceeded their carrying values by approximately 10% for each. Significant changes in assumptions or estimates, such as a reduction in profitability and/or cash flows, could result in non-cash goodwill and indefinite-lived intangible asset impairment charges in the future.

We believe that our accounting estimates pertaining to: revenue recognition for percentage-of-completion projects, including project profit or loss, which we define as project revenue less project costs of revenue, including project-related depreciation; allowances for doubtful accounts; fair value estimates, including those related to business acquisitions, valuations of goodwill and indefinite-lived intangible assets; estimated liabilities for future earn-out obligations; fair values of financial instruments; 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. Actual results could, however, vary materially from these accounting estimates.

Results of Operations

Comparison of Quarterly Results

The following table, which may contain slight summation differences due to rounding, 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 certain items, which are described in the comparison of results section below.

	For the Three Months Ended September 30										For the Nine Months Ended September 30
	2017					2016					2017					2016
Revenue	$	1,955.8		100.0	%	$	1,586.2		100.0	%	$	5,004.1		100.0	%	$	3,792.8		100.0	%
Costs of revenue, excluding depreciation and amortization	1,726.2			88.3	%	1,369.0			86.3	%	4,323.6			86.4	%	3,321.6			87.6	%
Depreciation and amortization	50.1			2.6	%	42.6			2.7	%	138.4			2.8	%	122.2			3.2	%
General and administrative expenses	66.4			3.4	%	67.1			4.2	%	202.0			4.0	%	195.0			5.1	%
Interest expense, net	17.6			0.9	%	13.1			0.8	%	45.0			0.9	%	37.9			1.0	%
Equity in earnings of unconsolidated affiliates	(7.4		)	(0.4	)%	—			—	%	(15.1		)	(0.3	)%	(3.5		)	(0.1	)%
Other income, net	(4.7		)	(0.2	)%	(1.0		)	(0.1	)%	(4.1		)	(0.1	)%	(12.8		)	(0.3	)%
Income before income taxes	$	107.6		5.5	%	$	95.3		6.0	%	$	314.3		6.3	%	$	132.4		3.5	%
Provision for income taxes	(43.4		)	(2.2	)%	(38.8		)	(2.4	)%	(126.2		)	(2.5	)%	(54.3		)	(1.4	)%
Net income	$	64.2		3.3	%	$	56.5		3.6	%	$	188.2		3.8	%	$	78.1		2.1	%
Net income attributable to non-controlling interests	0.4			0.0	%	0.3			0.0	%	1.8			0.0	%	0.4			0.0	%
Net income attributable to MasTec, Inc.	$	63.8		3.3	%	$	56.3		3.5	%	$	186.4		3.7	%	$	77.7		2.0	%

We review our operating results by reportable segment. See Note 13 - 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 consistent with our consolidated EBITDA calculation. See the discussion of our non-U.S. GAAP financial measures, including certain adjusted non-U.S. GAAP measures, as described, following the comparison of results discussion below. The following table presents revenue, EBITDA and EBITDA margin by reportable segment for the periods indicated (dollar amounts in millions):

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	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
Reportable Segment:	2017			2016			2017			2016			2017					2016					2017					2016
Communications	$	610.5		$	624.3		$	1,762.2		$	1,728.0		$	65.3		10.7	%	$	62.8		10.1	%	$	173.2		9.8	%	$	190.9		11.0	%
Oil and Gas	1,161.0			736.0			2,757.2			1,454.3			108.1			9.3	%	117.8			16.0	%	356.1			12.9	%	187.6			12.9	%
Electrical Transmission	81.8			101.7			277.3			283.6			4.5			5.5	%	(8.3		)	(8.1	)%	11.2			4.0	%	(42.0		)	(14.8	)%
Power Generation and Industrial	96.9			123.6			204.1			324.7			9.3			9.6	%	6.1			4.9	%	14.8			7.3	%	13.8			4.3	%
Other	10.6			7.6			14.2			14.9			10.1			95.2	%	(3.1		)	(40.6	)%	11.6			81.7	%	(2.6		)	(17.4	)%
Eliminations	(5.0		)	(7.0		)	(10.9		)	(12.7		)	—			—		—			—		—			—		—			—
Corporate	—			—			—			—			(22.0		)	NA		(24.3		)	NA		(69.2		)	NA		(55.1		)	NA
Consolidated Results	$	1,955.8		$	1,586.2		$	5,004.1		$	3,792.8		$	175.3		9.0	%	$	151.0		9.5	%	$	497.7		9.9	%	$	292.6		7.7	%

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 (this “Form 10-Q”).

Three Months Ended September 30, 2017 Compared to Three Months Ended September 30, 2016

Revenue. For the three month period ended September 30, 2017, consolidated revenue increased to $1,956 million from $1,586 million, an increase of $370 million, or 23%, as compared with the same period in 2016, driven largely by our Oil and Gas segment, for which revenue increased by $425 million, or 58%, offset, in part by lower revenue in our Power Generation and Industrial, Electrical Transmission and Communications segments, of $61 million in total, or 7%. Organic revenue increased by approximately $308 million, or 19%, and acquisitions contributed $62 million in revenue.

Communications Segment. Communications revenue was $610 million for the three month period ended September 30, 2017, as compared with $624 million for the same period in 2016, a decrease of $14 million, or 2%. Acquisitions contributed $38 million of revenue, which was offset by a decrease in organic revenue of $51 million, or 8%. The decrease in organic revenue was primarily driven by lower levels of install-to-the-home and customer fulfillment revenue in 2017, as previously disclosed.

Oil and Gas Segment. Oil and Gas revenue was $1,161 million for three month period ended September 30, 2017, as compared with $736 million for the same period in 2016, an increase of $425 million, or 58%. The increase in Oil and Gas revenue was driven primarily by an increase in multiple large long-haul pipeline construction projects.

Electrical Transmission Segment. Electrical Transmission revenue was $82 million for the three month period ended September 30, 2017, as compared with $102 million for the same period in 2016, a decrease of $20 million, or 20%, driven primarily by project activity and timing.

Power Generation and Industrial Segment. Power Generation and Industrial revenue was $97 million for the three month period ended September 30, 2017, as compared with $124 million for the same period in 2016, a decrease of $27 million, or 22%. Acquisitions contributed $25 million of revenue, which was offset by a decrease in organic revenue of $51 million, or 42%. The decrease in organic revenue was driven primarily by lower levels of renewable power project activity and timing.

Other Segment. Other segment revenue totaled $11 million for the three month period ended September 30, 2017, as compared with $8 million for the same period in 2016, an increase of approximately $3 million, or 40%, driven primarily by increased levels of activity from our oil and gas operations in Mexico, offset by a decrease in revenue from a proportionately consolidated non-controlled Canadian joint venture.

Costs of revenue, excluding depreciation and amortization. Costs of revenue, excluding depreciation and amortization, increased by $357 million, or 26%, to $1,726 million for the three month period ended September 30, 2017, as compared with $1,369 million for the same period in 2016. Higher revenue contributed $319 million of an increase in costs of revenue, excluding depreciation and amortization, whereas decreased productivity resulted in an increase of approximately $38 million. Costs of revenue, excluding depreciation and amortization, as a percentage of revenue increased by approximately 200 basis points, from 86.3% of revenue for the three month period ended September 30, 2016 to 88.3% of revenue for the same period in 2017. The basis point increase was driven by reduced project efficiencies and mix in our Oil and Gas segment, offset, in part, by improved project efficiencies and mix in our Communications, Electrical Transmission and Power Generation and Industrial segments. Additionally, costs of revenue, excluding depreciation and amortization, improved in our Other segment for the three month period ended September 30, 2017 as compared with the same period in 2016 due to a reduction in project losses on a proportionately consolidated non-controlled Canadian joint venture, which totaled $0.4 million for the three month period ended September 30, 2017 as compared with $5 million in the prior year period. This project, which is managed by a third party and for which we have minimal direct construction involvement, has experienced delays, which has extended the timeline and resulted in project losses.

Depreciation and amortization. Depreciation and amortization was $50 million, or 2.6% of revenue, for the three month period ended September 30, 2017 as compared with $43 million, or 2.7% of revenue, in 2016, an increase of $8 million, or 18%. Acquisitions contributed $4 million of incremental depreciation and amortization for the three month period ended September 30, 2017 as compared with the same period in 2016. As a percentage of revenue, depreciation and amortization decreased slightly due primarily to higher levels of revenue.

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General and administrative expenses. General and administrative expenses were $66 million, or 3.4% of revenue, for the three month period ended September 30, 2017, as compared with $67 million, or 4.2% of revenue, for the same period in 2016, a decrease of $1 million, or 1%. Acquisitions contributed $6 million of incremental general and administrative expenses for the three month period ended September 30, 2017, whereas general and administrative expenses in the prior year period included certain restructuring charges of approximately $5 million related to our efforts to streamline our western Canadian oil and gas and our electrical transmission operations, which efforts were substantially completed in 2016. Excluding the effects of the above mentioned items, administrative expenses decreased by $2 million as compared with the same period in the prior year due primarily to the timing of legal matters and other settlements. Overall, general and administrative expenses as a percentage of revenue decreased by 80 basis points for the three month period ended September 30, 2017 as compared with the same period in the prior year, due primarily to improvements in overhead cost utilization from higher levels of revenue.

Interest expense, net. Interest expense, net of interest income, was $18 million, or 0.9% of revenue, for the three month period ended September 30, 2017 as compared with $13 million, or 0.8% of revenue, in 2016. The increase in interest expense was primarily due to higher levels of financing costs, including discount charges on financing arrangements, as well as an increase in interest expense on our Credit Facility in the third quarter of 2017 as compared with 2016.

Equity in earnings of unconsolidated affiliates. Equity in earnings or losses of unconsolidated affiliates includes our share of income or losses from equity investees. For the three month period ended September 30, 2017, equity in earnings from unconsolidated affiliates was $7 million and related primarily to our investments in the Waha JVs, which commenced operations in 2017.

Other income, net. Other income, net, consists primarily of gains or losses from sales of, or changes in estimated recoveries from, assets and investments, certain legal/other settlements, gains or losses from changes to estimated earn-out accruals, and certain restructuring charges related to losses on disposal of excess fixed assets. For the three month period ended September 30, 2017, other income, net, was $5 million, as compared with $1 million for the same period in the prior year. Other income, net, for the three month period ended September 30, 2017 included approximately $3 million of income from changes to estimated earn-out accruals. Gains on sales of equipment, net, totaled $2 million and $1 million for the three month periods ended September 30, 2017 and 2016, respectively.

Provision for income taxes.Income tax expense was $43 million for the three month period ended September 30, 2017 as compared with $39 million for the same period in the prior year. In the third quarter of 2017, we had pre-tax income of $108 million as compared with $95 million for the same period in the prior year. Our effective tax rate for the three month period ended September 30, 2017decreased versus the same period in 2016, primarily due to tax credits that were recognized during the third quarter of 2017, offset by the effect of losses in foreign jurisdictions.

Analysis of EBITDA by Segment

Communications Segment. EBITDA for our Communications segment was $65 million, or 10.7% of revenue, for the three month period ended September 30, 2017, as compared with $63 million, or 10.1% of revenue, for the same period in 2016, an increase of approximately $3 million, or 4%. The increase was primarily due to production efficiencies.

Oil and Gas Segment. EBITDA for our Oil and Gas segment was $108 million, or 9.3% of revenue, for the three month period ended September 30, 2017, as compared with $118 million, or 16.0% of revenue, for the same period in 2016, a decrease in EBITDA of $10 million, or approximately 8%. Higher revenue contributed an increase in EBITDA of $68 million, which was offset by a decrease in EBITDA from lower EBITDA margins due to reduced project efficiencies and mix.

Electrical Transmission Segment. EBITDA for our Electrical Transmission segment was $5 million, or 5.5% of revenue, for the three month period ended September 30, 2017, as compared with EBITDA of negative $8 million, or negative 8.1% of revenue, for the same period in 2016, for an improvement in EBITDA of $13 million. The improvement in Electrical Transmission EBITDA was due primarily to a combination of project efficiencies and mix, the non-recurrence of approximately $4 million of restructuring charges for the three month period ended September 30, 2016, and improved cost and overhead utilization.

Power Generation and Industrial Segment. EBITDA for our Power Generation and Industrial segment was $9 million, or 9.6% of revenue, for the three month period ended September 30, 2017, as compared with EBITDA of $6 million, or 4.9% of revenue, for the same period in 2016, an improvement in EBITDA of $3 million, or 52%. As a percentage of revenue, segment EBITDA improved by approximately 470 basis points as compared with the same period in the prior year due to improved project efficiencies and mix, offset, in part, by reduced cost and overhead utilization due to lower revenue.

Other Segment. EBITDA from Other businesses was $10 million for the three month period ended September 30, 2017, as compared with EBITDA of negative $3 million for the same period in 2016, an improvement of $13 million. Other segment EBITDA for the three month period ended September 30, 2017 included $7 million of equity in earnings from unconsolidated affiliates related to our investments in the Waha JVs, which commenced operations in the first half of 2017, and, for the three month periods ended September 30, 2017 and 2016, included losses of $0.4 million and $5 million, respectively, on a proportionately consolidated non-controlled Canadian joint venture. The remaining improvement in Other segment EBITDA was driven by an increase in EBITDA from our oil and gas operations in Mexico.

Corporate. Corporate EBITDA was negative $22 million for the three month period ended September 30, 2017, as compared with EBITDA of negative $24 million for the same period in 2016, for an increase in EBITDA of $2 million. Corporate EBITDA for the three month period ended September 30, 2017 included approximately $3 million of income from changes to estimated earn-out accruals. For the three month period ended September 30, 2017, other corporate expenses increased as compared with the prior year period primarily as a result of costs related to the timing of legal matters and other settlements.

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Nine Months Ended September 30, 2017 Compared to Nine Months Ended September 30, 2016

Revenue. For the nine month period ended September 30, 2017, consolidated revenue increased to $5,004 million from $3,793 million, an increase of $1,211 million, or 32%, as compared with the same period in 2016. Oil and Gas revenue increased by $1,303 million, or 90%, Communications revenue increased by $34 million, or 2%, whereas Power Generation and Industrial revenue decreased by $121 million, or 37%, Electrical Transmission revenue decreased by $6 million, or 2%, and Other segment revenue decreased by $1 million, or 4%. Organic revenue increased by approximately $1,115 million, or 29%, and acquisitions contributed $96 million in revenue.

Communications Segment. Communications revenue was $1,762 million for the nine month period ended September 30, 2017, as compared with $1,728 million for the same period in 2016, an increase of $34 million, or 2%. Acquisitions contributed $71 million of revenue, which was offset by a decrease in organic revenue of $37 million. The decrease in organic revenue was primarily driven by lower levels of install-to-the-home and customer fulfillment revenue in 2017, as previously disclosed.

Oil and Gas Segment. Oil and Gas revenue was $2,757 million for nine month period ended September 30, 2017, as compared with $1,454 million for the same period in 2016, an increase of $1,303 million, or 90%. The increase in Oil and Gas revenue was driven primarily by an increase in multiple large long-haul pipeline construction projects.

Electrical Transmission Segment. Electrical Transmission revenue was $277 million for the nine month period ended September 30, 2017, as compared with $284 million for the same period in 2016, a decrease of $6 million, or 2%, due primarily to project activity and timing.

Power Generation and Industrial Segment. Power Generation and Industrial revenue was $204 million for the nine month period ended September 30, 2017, as compared with $325 million for the same period in 2016, a decrease of $121 million, or 37%. Acquisitions contributed $25 million of revenue, which was offset by a decrease in organic revenue of $145 million. The decrease in organic revenue was driven primarily by lower levels of renewable power project activity and timing.

Other Segment. Other segment revenue totaled $14 million for the nine month period ended September 30, 2017, as compared with $15 million for the same period in 2016, a decrease of approximately $1 million, or 4%, driven by a reduction in revenue from a proportionately consolidated non-controlled Canadian joint venture, offset, in part, by increased levels of activity from our oil and gas operations in Mexico.

Costs of revenue, excluding depreciation and amortization. Costs of revenue, excluding depreciation and amortization increased by approximately $1,002 million, or 30%, to $4,324 million for the nine month period ended September 30, 2017, as compared with $3,322 million for the same period in 2016. Higher revenue contributed $1,061 million of an increase in costs of revenue, excluding depreciation and amortization, whereas improved productivity resulted in a decrease of approximately $59 million. Costs of revenue, excluding depreciation and amortization, as a percentage of revenue decreased by approximately 120 basis points, from 87.6% of revenue for the nine month period ended September 30, 2016 to 86.4% of revenue for the same period in 2017. This basis point improvement was driven primarily by our Electrical Transmission and Power Generation and Industrial segments, which benefited from improved project efficiencies, close-outs and mix, as well as the non-recurrence of certain first quarter 2016 project losses. These improvements were offset, in part, by reduced project efficiencies and mix in our Oil and Gas and Communications segments. Additionally, project losses on a proportionately consolidated non-controlled Canadian joint venture in our Other segment totaled $7 million for the nine month period ended September 30, 2017 as compared with $5 million for the same period in the prior year.

Depreciation and amortization. Depreciation and amortization was $138 million, or 2.8% of revenue, for the nine month period ended September 30, 2017 as compared with $122 million, or 3.2% of revenue, in 2016, an increase of $16 million, or 13%. Acquisitions contributed $6 million of incremental depreciation and amortization for the nine month period ended September 30, 2017 as compared with the same period in 2016. As a percentage of revenue, depreciation and amortization decreased by approximately 50 basis points, due primarily to higher levels of revenue.

General and administrative expenses. General and administrative expenses were $202 million, or 4.0% of revenue, for the nine month period ended September 30, 2017, as compared with $195 million, or 5.1% of revenue, for the same period in 2016, an increase of $7 million, or 4%. Acquisitions contributed $10 million of incremental general and administrative expenses for the nine month period ended September 30, 2017, whereas general and administrative expenses for the same period in the prior year included certain restructuring charges of approximately $11 million related to our efforts to streamline our western Canadian oil and gas and our electrical transmission operations, which efforts were substantially completed in 2016. Excluding the effects of the above mentioned items, various administrative expenses increased by approximately $8 million for the nine month period ended September 30, 2017, driven primarily by costs related to the timing of legal matters and other settlements as well as costs associated with growth initiatives. Overall, for the nine month period ended September 30, 2017, general and administrative expenses as a percentage of revenue improved 110 basis points as compared with the same period in the prior year, due primarily to improvements in overhead cost utilization from higher levels of revenue.

Interest expense, net. Interest expense, net of interest income, was $45 million, or 0.9% of revenue, for the nine month period ended September 30, 2017 as compared with $38 million, or 1.0% of revenue, in 2016. The increase was primarily due to higher levels of financing costs, including discount charges on financing arrangements, as well as an increase in interest expense on our Credit Facility for the nine month period ended September 30, 2017 as compared with the same period in 2016.

Equity in earnings of unconsolidated affiliates. Equity in earnings or losses of unconsolidated affiliates includes our share of income or losses from equity investees. For the nine month period ended September 30, 2017, equity in earnings from unconsolidated affiliates was $15 million, and related primarily to our investments in the Waha JVs, which commenced operations in 2017. Equity in earnings from unconsolidated affiliates for the nine month period ended September 30, 2016 was approximately $4 million and related to expected recoveries from our interests in certain pre-acquisition equity method investments of Pacer, of which the remaining investment as of September 30, 2017 is in the final stages of liquidation and is being managed by a receiver.

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Other income, net. Other income, net, consists primarily of gains or losses from sales of, or changes in estimated recoveries from, assets and investments, certain legal/other settlements, gains or losses from changes to estimated earn-out accruals, and certain restructuring charges related to losses on disposal of excess fixed assets. For the nine month period ended September 30, 2017, other income, net, was $4 million. Other income, net, for the nine month period ended September 30, 2017 included $12 million of expenses related to changes in expected recovery amounts for an investment that is in the final stages of liquidation, as well as reduced recovery expectations on a long-term note receivable due to recent bankruptcy proceedings for a former customer, offset by $12 million of income from changes to estimated earn-out accruals. Other income, net, for the nine month period ended September 30, 2016 totaled $13 million, and included approximately $10 million related to a settlement in connection with a previously acquired business, $3 million of restructuring charges related to estimated losses on the planned disposal of fixed assets held-for-sale and $3 million of income from changes to estimated earn-out accruals. Gains on sales of equipment, net, totaled approximately $4 million and $3 million for the nine month periods ended September 30, 2017 and 2016, respectively.

Provision for income taxes.Income tax expense was $126 million for the nine month period ended September 30, 2017 as compared with $54 million for the same period in the prior year. For the nine month period ended September 30, 2017, we had pre-tax income of $314 million as compared with $132 million for the same period in the prior year. Our effective tax rate for the nine month period ended September 30, 2017decreased versus the same period in 2016, primarily due to tax credits that were recognized during the third quarter of 2017, offset by the effect of losses in foreign jurisdictions.

Analysis of EBITDA by Segment

Communications Segment. EBITDA for our Communications segment was $173 million, or 9.8% of revenue, for the nine month period ended September 30, 2017, as compared with $191 million, or 11.0% of revenue, for the same period in 2016, a decrease of approximately $18 million, or 9%. This decrease was primarily due to: (i) the non-recurrence of a first quarter 2016 gain from a settlement in connection with a previously acquired business; (ii) production inefficiencies; (iii) certain other expense reduction efforts, as well as timing of legal matters and other settlements; (iv) offset, in part, by a benefit from higher revenue.

Oil and Gas Segment. EBITDA for our Oil and Gas segment was $356 million, or 12.9% of revenue, for the nine month period ended September 30, 2017, as compared with $188 million, or 12.9% of revenue, for the same period in 2016, an increase of $168 million, or approximately 90%, driven primarily by higher revenue. As a percentage of revenue, segment EBITDA was flat for the nine month periods ended September 30, 2017 as compared with the same period in 2016. The effect of reduced project efficiencies and mix for the nine month period ended September 30, 2017 was partially offset by the non-recurrence of a first quarter 2016 project loss of approximately $13 million on a western Canadian oil and gas project and the non-recurrence of approximately $7 million of 2016 restructuring charges related to efforts to streamline our western Canadian oil and gas operations.

Electrical Transmission Segment. EBITDA for our Electrical Transmission segment was $11 million, or 4.0% of revenue, for the nine month period ended September 30, 2017, as compared with EBITDA of negative $42 million, or negative 14.8% of revenue, for the same period in 2016, an increase in EBITDA of $53 million. The improvement in Electrical Transmission EBITDA was due to a combination of project efficiencies and mix, improved cost and overhead utilization due to higher levels of revenue, the non-recurrence of a first quarter 2016 project loss of approximately $15 million on a large transmission project, and the non-recurrence of approximately $7 million of 2016 restructuring charges related to efforts to streamline our operations.

Power Generation and Industrial Segment. EBITDA for our Power Generation and Industrial segment was $15 million, or 7.3% of revenue, for the nine month period ended September 30, 2017, as compared with EBITDA of $14 million, or 4.3% of revenue, for the same period in 2016, an increase in EBITDA of $1 million, or 7% As a percentage of revenue, segment EBITDA improved by approximately 300 basis points for the nine month period ended September 30, 2017 as compared with the same period in the prior year due to improved project efficiencies and mix, offset, in part, by reduced cost and overhead utilization due to lower revenue.

Other Segment. EBITDA from Other businesses was approximately $12 million for the nine month period ended September 30, 2017, as compared with EBITDA of negative $3 million for the same period in 2016, an increase in EBITDA of $14 million. Other segment EBITDA for the nine month period ended September 30, 2017 included $15 million of equity in earnings from unconsolidated affiliates related to our investments in the Waha JVs, which commenced operations in the first half of 2017. For the nine month periods ended September 30, 2017 and 2016, Other segment EBITDA included losses of $7 million and $5 million, respectively, on a proportionately consolidated non-controlled Canadian joint venture. The remaining improvement in Other segment EBITDA was driven by an increase in EBITDA from our oil and gas operations in Mexico.

Corporate. Corporate EBITDA was negative $69 million for the nine month period ended September 30, 2017, as compared with EBITDA of negative $55 million for the same period in 2016, for a decrease in EBITDA of $14 million. Corporate EBITDA for the nine month period ended September 30, 2017 included approximately $12 million of expenses related to changes in expected recovery amounts for an investment that is in the final stages of liquidation, as well as reduced recovery expectations on a long-term note receivable due to recent bankruptcy proceedings for a former customer, offset by approximately $12 million of income from changes to estimated earn-out accruals. For the nine month period ended September 30, 2017, other corporate expenses increased as compared with the same period in the prior year, due primarily to costs related to the timing of legal matters and other settlements, as well as costs associated with growth initiatives, including incentive and compensation expense.

Foreign Operations

Our foreign operations are primarily in Canada. See Note 13 - Segments and Related Information in the notes to the condensed unaudited consolidated financial statements, which is incorporated by reference.

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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 before interest, income taxes, depreciation and amortization (“EBITDA”). In addition, we have presented “Adjusted EBITDA,” as well as adjusted net income (“Adjusted Net Income”) and adjusted diluted earnings per share (“Adjusted Diluted Earnings Per Share”). The “adjusted” non-U.S. GAAP measures exclude, as applicable to the particular periods, non-cash stock-based compensation expense, certain restructuring charges, project results, which for the periods presented, were losses, from a proportionately consolidated non-controlled Canadian joint venture that was underway when we acquired Pacer in 2014, and whose sole activity involves the construction of a bridge, a business in which we do not otherwise engage, is managed by a third party, and for which we have minimal direct construction involvement and automatically terminates upon completion of the project, and charges or recoveries from multi-employer pension plan withdrawals, and, for Adjusted Net Income and Adjusted Diluted Earnings Per Share, the tax effects of the adjusted items, including non-cash stock based compensation. 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 and Adjusted EBITDA, as well as Adjusted Net Income and Adjusted Diluted Earnings Per Share, 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, and, for non-cash stock-based compensation expense, can also be subject to volatility from changes in the market price per share of our common stock or variations in the value of shares granted. Additionally, these measures provide a baseline for analyzing trends in our underlying business.

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 or diluted earnings per share, 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 net income to EBITDA and Adjusted EBITDA, 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.

	For the Three Months Ended September 30								For the Nine Months Ended September 30
	2017				2016				2017				2016
Net income	$	64.2	3.3	%	$	56.5	3.6	%	$	188.2	3.8	%	$	78.1	2.1	%
Interest expense, net	17.6		0.9	%	13.1		0.8	%	45.0		0.9	%	37.9		1.0	%
Provision for income taxes	43.4		2.2	%	38.8		2.4	%	126.2		2.5	%	54.3		1.4	%
Depreciation and amortization	50.1		2.6	%	42.6		2.7	%	138.4		2.8	%	122.2		3.2	%
EBITDA	$	175.3	9.0	%	$	151.0	9.5	%	$	497.7	9.9	%	$	292.6	7.7	%
Non-cash stock-based compensation expense	3.4		0.2	%	3.9		0.2	%	10.5		0.2	%	11.3		0.3	%
Restructuring charges	—		—	%	4.7		0.3	%	0.6		0.0	%	13.8		0.4	%
Project results from non-controlled joint venture	0.4		0.0	%	5.1		0.3	%	7.4		0.1	%	5.1		0.1	%
Charges (recoveries) from multi-employer pension plan withdrawals	0.6		0.0	%	—		—	%	0.6		0.0	%	—		—	%
Adjusted EBITDA	$	179.6	9.2	%	$	164.8	10.4	%	$	516.7	10.3	%	$	322.8	8.5	%

A reconciliation of EBITDA to Adjusted EBITDA and Adjusted EBITDA margin by reportable segment, for the periods indicated is as follows:

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	For the Three Months Ended September 30										For the Nine Months Ended September 30
	2017					2016					2017					2016
EBITDA	$	175.3		9.0	%	$	151.0		9.5	%	$	497.7		9.9	%	$	292.6		7.7	%
Non-cash stock-based compensation expense	3.4			0.2	%	3.9			0.2	%	10.5			0.2	%	11.3			0.3	%
Restructuring charges	—			—	%	4.7			0.3	%	0.6			0.0	%	13.8			0.4	%
Project results from non-controlled joint venture	0.4			0.0	%	5.1			0.3	%	7.4			0.1	%	5.1			0.1	%
Charges (recoveries) from multi-employer pension plan withdrawals	0.6			0.0	%	—			—	%	0.6			0.0	%	—			—	%
Adjusted EBITDA	$	179.6		9.2	%	$	164.8		10.4	%	$	516.7		10.3	%	$	322.8		8.5	%
Reportable Segment:
Communications	$	65.5		10.7	%	$	63.0		10.1	%	$	173.6		9.9	%	$	191.4		11.1	%
Oil and Gas	108.1			9.3	%	118.0			16.0	%	356.1			12.9	%	194.1			13.3	%
Electrical Transmission	4.5			5.5	%	(3.8		)	(3.7	)%	11.8			4.3	%	(34.7		)	(12.2	)%
Power Generation and Industrial	9.3			9.6	%	6.1			4.9	%	14.8			7.3	%	13.9			4.3	%
Other	10.5			98.9	%	2.1			27.2	%	19.0			133.3	%	2.6			17.2	%
Corporate	(18.3		)	NA		(20.6		)	NA		(58.6		)	NA		(44.4		)	NA
Adjusted EBITDA	$	179.6		9.2	%	$	164.8		10.4	%	$	516.7		10.3	%	$	322.8		8.5	%

Adjusted Net Income and Adjusted Diluted Earnings Per Share

The tables below, which may contain slight summation differences due to rounding, reconcile reported net income and reported diluted earnings per share, the most directly comparable U.S. GAAP financial measures, to Adjusted Net Income and Adjusted Diluted Earnings Per Share.

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	For the Three Months Ended September 30
	2017						2016
	Net Income (in millions)			Diluted Earnings Per Share			Net Income (in millions)			Diluted Earnings Per Share
Reported U.S. GAAP measure	$	64.2		$	0.77		$	56.5		$	0.69
Adjustments:
Non-cash stock-based compensation expense	3.4			0.04			3.9			0.05
Restructuring charges	—			—			4.7			0.06
Project results from non-controlled joint venture	0.4			0.00			5.1			0.06
Charges (recoveries) from multi-employer pension plan withdrawals	0.6			0.01			—			—
Total adjustments, pre-tax	$	4.4		$	0.05		$	13.7		$	0.17
Income tax effect of adjustments (a)	(0.6		)	(0.01		)	(4.0		)	(0.05		)
Adjusted non-U.S. GAAP measure	$	68.0		$	0.82		$	66.3		$	0.81

	For the Nine Months Ended September 30
	2017						2016
	Net Income (in millions)			Diluted Earnings Per Share			Net Income (in millions)			Diluted Earnings Per Share
Reported U.S. GAAP measure	$	188.2		$	2.27		$	78.1		$	0.96
Adjustments:
Non-cash stock-based compensation expense	10.5			0.13			11.3			0.14
Restructuring charges	0.6			0.01			13.8			0.17
Project results from non-controlled joint venture	7.4			0.09			5.1			0.06
Charges (recoveries) from multi-employer pension plan withdrawals	0.6			0.01			—			—
Total adjustments, pre-tax	$	19.1		$	0.23		$	30.3		$	0.37
Income tax effect of adjustments (a)	(4.1		)	(0.05		)	(10.6		)	(0.13		)
Adjusted non-U.S. GAAP measure	$	203.1		$	2.45		$	97.7		$	1.20

(a) Represents the tax effect of the adjusted items that are subject to tax, including the tax effects of share-based compensation expense. Tax effects are determined based on the tax treatment of the related items, the incremental statutory tax rate of the jurisdictions pertaining to each adjustment, and taking into consideration their effect on pre-tax income. For both the three and nine month periods ended September 30, 2017, our consolidated effective tax rate, as reported, was 40%, and as adjusted, was 39%. For the three and ninemonth periods ended September 30, 2016, our consolidated effective tax rate, as reported, was 41% for both, and as adjusted, was 39% and 40%, respectively.

Financial Condition, Liquidity and Capital Resources

Our primary sources of liquidity are cash flows from operations, availability under our Credit Facility and our cash balances. Our primary liquidity needs are for working capital, capital expenditures, insurance and performance collateral in the form of cash and letters of credit, earn-out obligations, cost and equity investee funding requirements, debt service, income taxes and share repurchase programs. We also evaluate opportunities for strategic acquisitions and investments from time to time, and we may consider opportunities to borrow additional funds, or 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. For the nine month period ended September 30, 2017, we spent $83 million on capital expenditures, or $70 million, net of asset disposals, and incurred approximately $131 million of equipment purchases under capital lease and other financing arrangements. We estimate that we will spend approximately $105 million on capital expenditures, or approximately $90 million, net of asset disposals in 2017, and expect to incur approximately $155 million of equipment purchases under capital lease or other financing arrangements. Actual capital expenditures may increase or decrease in the future depending upon business activity levels, as well as ongoing assessments of equipment lease versus buy decisions based on short and long-term equipment requirements.

Acquisitions and Acquisition-Related Contingent Consideration. We typically utilize cash for our strategic acquisitions of other businesses, and for the nine month period ended September 30, 2017, we used $116 million of cash for this purpose. In addition, 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. Potential future earn-out obligations 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. The estimated total value of earn-out obligations recorded as liabilities as of September 30,

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2017 was approximately $105 million. Of this amount, $15 million represents the liability for earn-out obligations that have been earned. The remainder, approximately $90 million, is management’s estimate of potential earn-out obligations that are contingent upon future performance. There were no payments related to earn-out obligations for the three month period ended September 30, 2017, and for the nine month period ended September 30, 2017, we made payments of $19 million. For the three and nine month periods ended September 30, 2016, we made payments of $5 million and $20 million, respectively, related to earn-out obligations.

Income Taxes. Tax payments, net of tax refunds, were approximately $78 million and $15 million, respectively, for the nine month periods ended September 30, 2017 and 2016. Tax payments, which are made quarterly, vary with changes in taxable income and earnings based on estimates of full year taxable income activity and estimated tax rates.

Working Capital. We need working capital to support seasonal variations in our business, primarily due to the effect 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. Working capital needs are generally higher during the summer and 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 requirements also tend to increase when we commence multiple projects or particularly large projects because labor, including subcontractor costs, and certain other costs, including inventory, become payable before the receivables resulting from work performed are collected. The timing of billing milestones and project close-outs can contribute to changes in unbilled revenue. As of September 30, 2017, we expect that substantially all of our CIEB will be billed to customers in the normal course of business within the next 12 months. Accounts receivable balances, which consist of contract billings as well as CIEB and retainage, increased to $1.5 billion as of September 30, 2017 from $1.2 billion as of December 31, 2016 due to higher levels of quarterly revenue, as well as the ramp-up of various projects, primarily in our oil and gas business.

Our payment 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% of billings) until the job is completed. As part of our ongoing working capital management practices, we evaluate opportunities to improve our working capital cycle time through contractual provisions and certain financing arrangements. 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.

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, anticipated capital expenditures, debt service obligations, insurance and performance collateral requirements, letter of credit needs, earn-out obligations, required income tax payments, acquisition and other investment funding requirements and other liquidity needs for at least the next 12 months.

Sources and Uses of Cash

As of September 30, 2017, we had $746 million in working capital, defined as current assets less current liabilities, as compared with $562 million as of December 31, 2016, an increase of approximately $183 million. Total cash and cash equivalents of $44 million as of September 30, 2017increased by $5 million from total cash and cash equivalents of $39 million as of December 31, 2016.

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

	For the Nine Months Ended September 30
	2017			2016
Net cash provided by operating activities	$	178.6		$	127.1
Net cash used in investing activities	$	(249.4	)	$	(94.1	)
Net cash provided by (used in) financing activities	$	75.6		$	(27.6	)

Operating Activities. Cash flow from operations is primarily influenced by changes in the timing of 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, CIEB, accounts payable and accrued expenses and BIEC, all of which tend to be related. These working capital items are 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, 2017 was $179 million, as compared with approximately $127 million of net cash provided by operating activities for the same period in 2016. The increase in cash flow from operating activities was driven by an increase in net income of $110 million due to growth in revenue and an increase in the effect of non-cash adjustments of $107 million, partially offset by a decrease in the effect of net changes in assets and liabilities of $165 million.

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Our days sales outstanding (“DSO”), net of BIEC, was 67 as of September 30, 2017, as compared with 68 as of December 31, 2016 and 61 as of September 30, 2016. DSO, net of BIEC, is calculated as accounts receivable, net, less BIEC, divided by average daily revenue for the most recently completed quarter as of the balance sheet date. DSOs can fluctuate from period to period due to the timing of collections and settlements, changes in project and customer mix and the effect of working capital initiatives. 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 increased by $155 million to $249 million for the nine month period ended September 30, 2017 from $94 million for the nine month period ended September 30, 2016. For the nine month period ended September 30, 2017, payments for acquisitions, net of cash acquired, totaled $116 million due to our 2017 acquisitions, an increase of $112 million as compared with the same period in 2016. Payments for other investments, net, which relates primarily to activity associated with cost and equity investees, was $64 million for the nine month period ended September 30, 2017, as compared with $8 million for the same period in 2016, representing an increase in cash used in investing activities of approximately $56 million. Payments for other investments for the nine month period ended September 30, 2017 related to our equity investment in the Waha JVs, for which we have $19 million in letters of credit issued as collateral as of September 30, 2017, as described in Note 4 - Fair Value of Financial Instruments in the notes to the condensed unaudited consolidated financial statements, which is incorporated by reference. Proceeds from other investments for the nine month period ended September 30, 2017 related to recoveries from an equity method investment that is in the final stages of liquidation and is being managed by a receiver. Additionally, for the nine month period ended September 30, 2017, we spent $83 million on capital expenditures, or $70 million, net of asset disposals, as compared with capital expenditures, net of asset disposals, of $82 million for the same period in the prior year, for a decrease in cash used in investing activities of $12 million.

Financing Activities. Net cash provided by financing activities for the nine month period ended September 30, 2017 was $76 million, as compared with $28 million of net cash used in financing activities for the nine month period ended September 30, 2016, for an increase in cash provided by financing activities of $103 million. Credit facility related activity, net, for the nine month period ended September 30, 2017, totaled $162 million of borrowings, net of repayments, as compared to $37 million for the nine month period ended September 30, 2016, for an increase in cash provided by credit facility-related activities, net, of $125 million, which increase was partially offset by payments of $6 million for Credit Facility-related financing costs. Payments of acquisition-related contingent consideration for the nine month periods ended September 30, 2017 and 2016 were generally flat, totaling $19 million in 2017 as compared with $20 million in 2016.

Senior Secured Credit Facility

We have a senior secured credit facility that we refer to as our “Credit Facility,” which was amended and restated in February 2017. As of September 30, 2017, the Credit Facility has aggregate borrowing commitments of approximately $1.5 billion, composed of $1.1 billion of revolving commitments and an outstanding term loan in the aggregate principal amount of $400 million. Borrowings under the Credit Facility are used for working capital requirements, capital expenditures and other corporate purposes, including investments in equity or other investees, potential acquisitions or other strategic arrangements, and the repurchase or prepayment of indebtedness.

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 7 - Debt in the notes to the condensed unaudited consolidated financial statements, which is incorporated by reference.

4.875% Senior Notes

We have outstanding $400 million of 4.875% senior notes due March 15, 2023 (our “4.875% Senior Notes”), which were issued in 2013 in a registered public offering. The 4.875% Senior Notes are guaranteed by certain of our subsidiaries and are subject to certain provisions and covenants, as more fully described in Note 7 - Debt and Note 17 - Supplemental Guarantor Condensed Consolidating Financial Information in the notes to the audited consolidated financial statements included in our 2016 Form 10-K. Also see Note 16 - Supplemental Guarantor Condensed Unaudited Consolidating Financial Information in the notes to the condensed unaudited consolidated financial statements in this Form 10-Q, which are incorporated by reference.

Debt Covenants

We were in compliance with the provisions and covenants contained in our outstanding debt instruments as of September 30, 2017.

Additional Information

For detailed discussion and additional information pertaining to our debt instruments, see Note 7 - Debt in the notes to the audited consolidated financial statements included in our 2016 Form 10-K. Also see Note 7 - Debt in the notes to the condensed unaudited consolidated financial statements in this 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 multiemployer pension plans, liabilities associated with certain indemnification and guarantee arrangements and obligations relating to our cost and equity investees, including our

40

variable interest entities. Refer to Note 14 - Commitments and Contingencies, Note 4 - Fair Value of Financial Instruments and Note 15 - Related Party Transactions in the notes to the condensed unaudited consolidated financial statements, which 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. In times of low unemployment, our labor costs may increase due to shortages in the supply of skilled labor. Additionally, 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, which have recently caused volatility in the oil markets. 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, 2017, our variable interest rate debt was primarily related to our Credit Facility. Interest on outstanding revolving loans and our Term Loan 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. As of September 30, 2017, we had $301 million aggregate principal amount of outstanding revolving loans under our Credit Facility with a weighted average interest rate of 2.96% and a term loan with a balance of $400 million with an interest rate of 2.86%. A 100 basis point increase in the applicable interest rates under our credit facilities would have increased our interest expense by approximately $5 million for the nine month period ended September 30, 2017.

As of September 30, 2017, our fixed interest rate debt primarily included $400 million aggregate principal amount of 4.875% Senior Notes and an aggregate $187 million of capital lease obligations and notes payable, which accrued interest at a weighted average interest rate of approximately 3.4% as of September 30, 2017. 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

Our foreign operations are primarily in Canada. Revenue generated from foreign operations represented 3% of our total revenue for the nine month period ended September 30, 2017. Revenue and expense 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 three or nine month periods ended September 30, 2017. 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, 2017, foreign currency translation effects totaled approximately $0.6 million and $2.4 million of gains, respectively, and related primarily to our Canadian operations.

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, which exposure was not significant to our consolidated financial position as of September 30, 2017. We may enter into foreign currency derivative contracts in the future to manage such exposure.

Other Market Risk

As discussed in Note 4 - Fair Value of Financial Instruments in the notes to the condensed unaudited consolidated financial statements, which is incorporated by reference, we have certain investments that may be subject to market risk and could be subject to volatility based on market conditions.

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. Based on management’s evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective at the reasonable assurance level as of September 30, 2017.

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, 2017 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

41

PART II.     OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

Legacy Litigation

Refer to Note 14 – 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 2016 Form 10-K.

ITEM 1A.    RISK FACTORS

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 2016 Form 10-K, as updated by our Quarterly Report on Form 10-Q.

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, 2017:

Period	Total Number of Shares Purchased (a)	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Program (b)	Approximate Dollar Value of Shares that May Yet be Purchased under the Program
July 1 through July 31	—	$	—	—	$	100,000,000
August 1 through August 31	462	$	40.00	—	$	100,000,000
September 1 through September 30	—	$	—	—	$	100,000,000
Total	462			—

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

(b) No shares were purchased for the three months ended September 30, 2017 under the Company’s $100 million 2016 share repurchase program, which was publicly announced on February 26, 2016 and does not have an expiration date.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 6.     EXHIBITS

See the Exhibit Index following the signatures page to this Form 10-Q for a list of exhibits filed or furnished with this Form 10-Q, which Exhibit Index is incorporated herein by reference.

42

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 2, 2017
		/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)

43

Exhibit Index

Exhibit No.	Description
4.1*	Eighteenth Supplemental Indenture, dated as of November 1, 2017, by and among MasTec Inc., MasTec, Inc.’s subsidiary parties thereto, as guarantors, and U.S. Bank National Association, as trustee.
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.

44

EX-4.1

Exhibit 4.1

EIGHTEENTH SUPPLEMENTAL INDENTURE (this “Eighteenth Supplemental Indenture”), dated as of November 1, 2017, among CASH CONSTRUCTION COMPANY, INC., a Texas corporation (“Cash Construction”), and PRETEC DIRECTIONAL DRILLING, LLC, a Florida limited liability company (“Pretec” and, together with Cash Construction, the “New Guarantors”), MASTEC, INC., a Florida corporation (the “Company”), and U.S. BANK NATIONAL ASSOCIATION, as trustee under the Indenture referred to below (the “Trustee”).

W I T N E S S E T H:

WHEREAS the Company has heretofore executed and delivered to the Trustee an indenture (as amended, supplemented or otherwise modified, the “Indenture”) dated as of June 5, 2009, providing for (i) the issuance by the Company from time to time of its senior debt securities evidencing its unsecured and unsubordinated indebtedness, in an unlimited aggregate principal amount, in one or more series and (ii) the guaranty of such securities by the guarantors party thereto;

WHEREAS the Company has heretofore supplemented the Indenture by, among other things, executing and delivering to the Trustee (i) the Fifth Supplemental Indenture, dated as of March 18, 2013 (the “Fifth Supplemental Indenture”), by and among the Company, the guarantors party thereto and the Trustee, relating to the Company’s 4.875% Senior Notes due 2023 (the “Notes”), (ii) the Sixth Supplemental Indenture, dated as of September 30, 2013, by and among the Company, the guarantors party thereto and the Trustee, relating to the joinder of certain subsidiaries of the Company as subsidiary guarantors, (iii) the Seventh Supplemental Indenture, dated as of November 11, 2013, by and among the Company, the guarantors party thereto and the Trustee, relating to the joinder of certain subsidiaries of the Company as subsidiary guarantors, (iv) the Tenth Supplemental Indenture, dated as of July 10, 2014, by and among the Company, the guarantors party thereto and the Trustee, relating to the joinder of certain subsidiaries of the Company as subsidiary guarantors, (v) the Eleventh Supplemental Indenture, dated as of August 8, 2014, by and among the Company, the guarantors party thereto and the Trustee, relating to the joinder of certain subsidiaries as subsidiary guarantors, (vi) the Twelfth Supplemental Indenture, dated as of December 8, 2014, relating to the joinder of certain subsidiaries of the Company as subsidiary guarantors, (vii) the Thirteenth Supplemental Indenture, dated as of April 10, 2015, relating to certain amendments to the Indenture, (viii) the Fourteenth Supplemental Indenture, dated as of January 7, 2016, relating to the joinder of certain subsidiaries of the Company as subsidiary guarantors, (ix) the Fifteenth Supplemental Indenture, dated as of September 1, 2016, relating to the joinder of certain subsidiaries of the Company as subsidiary guarantors, (x) the Sixteenth Supplemental Indenture, dated as of March 7, 2017, relating to the joinder of certain subsidiaries of the Company as subsidiary guarantors, and (xi) the Seventeenth Supplemental Indenture, dated as of July 28, 2017, relating to the joinder of certain subsidiaries of the Company as subsidiary guarantors;

WHEREAS Section 4.15 of the Fifth Supplemental Indenture provides that under certain circumstances, the Company is required to cause the New Guarantors to execute and deliver to the Trustee a supplemental indenture pursuant to which the New Guarantors shall unconditionally guarantee all the Company’s obligations under the Notes and the Indenture on the terms and conditions set forth herein (the “Guarantee”); and

WHEREAS pursuant to Section 901 of the Indenture and Section 9.01 of the Fifth Supplemental Indenture, the Trustee, the Company and the New Guarantors are each authorized to execute and deliver this Supplemental Indenture.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, each of the New Guarantors, the Company and the Trustee mutually covenant and agree for the equal and ratable benefit of the holders of the Notes as follows:

1. Defined Terms. Defined terms used herein without definition shall have the meanings assigned to them in the Indenture.

2. Agreement to Guarantee. Each of the New Guarantors hereby agrees, jointly and severally with all existing guarantors (if any), to (i) provide an unconditional guarantee on the terms and subject to the conditions set forth in (A) Article Seventeen of the Indenture and (B) Article Eleven of the Fifth Supplemental Indenture and (ii) be bound by all other applicable provisions of the Indenture applicable to a Subsidiary Guarantor and to perform all of the obligations and agreements of a Subsidiary Guarantor under the Indenture.

3. No Recourse against Others. No recourse for the payment of the principal of, premium, if any, or interest on any of the notes or for any claim based thereon or otherwise in respect thereof, and no recourse under or upon any obligation, covenant or agreement of any obligor in this Indenture, or in any of the Notes or Guarantees or because of the creation of any Indebtedness represented thereby, shall be had against any incorporator, stockholder, officer, director, employee or controlling person of the Company or of any Subsidiary or of any successor Person thereof. Each Holder, by accepting the Notes, waives and releases all such liability. The waiver and release are part of the consideration for the issuance of the Notes. Such waiver may not be effective to waive liabilities under the federal securities laws.

4. Notices. All notices or other communications to any of the New Guarantors shall be given as provided in Section 13.02 of the Fifth Supplemental Indenture.

5. Ratification of Indenture; Supplemental Indentures Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every holder of Securities heretofore or hereafter authenticated and delivered shall be bound hereby.

6. Governing Law. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

7. Trustee Makes No Representation. The Trustee makes no representation as to the validity or sufficiency of this Supplemental Indenture.

8. Counterparts. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement.

- 2 -

9. Effect of Headings. The Section headings herein are for convenience only and shall not effect the construction thereof.

10. Recitals and Statements. The recitals and statements contained herein are deemed to be solely those of the New Guarantors and the Company.

- 3 -

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed as of the date first above written.

CASH CONSTRUCTION COMPANY, INC.

By:    /s/ Paul DiMarco                

Name: Paul DiMarco

Title: Vice President

PRETEC DIRECTIONAL DRILLING, LLC

By:     /s/ Robert E. Apple                 

Name: Robert E. Apple

Title: Vice President

MASTEC, INC.

By: /s/ George L. Pita                

Name: George L. Pita

Title: Executive Vice President, Chief Financial Officer and Principal Accounting Officer

[Signature page to Eighteenth Supplemental Indenture]

U.S. BANK NATIONAL ASSOCIATION,

as Trustee

By:     /s/ Donald T. Hurrelbrink            

Name: Donald T. Hurrelbrink

Title: Vice President

[Signature page to Eighteenth Supplemental Indenture]

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
	2017		2016
Earnings:
Income before income taxes	$	314,330	$	132,417
Add: Fixed charges	186,966		134,944
Less: Undistributed earnings from equity method investees	15,105		3,549
Total earnings	$	486,191	$	263,812
Fixed charges:
Interest expense	$	45,140	$	38,553
Estimate of interest expense within rental expense	141,826		96,391
Total fixed charges	$	186,966	$	134,944
Ratio of earnings to fixed charges	2.6		2.0

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(f) and 15d-15(f)) 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 2, 2017
		/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(f) and 15d-15(f)) 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 2, 2017
		/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, 2017 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 2, 2017
		/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, 2017, 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, 2017 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 2, 2017
		/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, 2017, or as a separate disclosure document of the Company or the certifying officers.

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 30, 2017
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
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		82,760,624

XML

Condensed Unaudited Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue		$ 1,955,752	$ 1,586,181	$ 5,004,116	$ 3,792,811
Costs of revenue, excluding depreciation and amortization		1,726,173	1,368,988	4,323,642	3,321,571
Depreciation and amortization		50,101	42,584	138,384	122,249
General and administrative expenses		66,397	67,131	202,001	195,031
Interest expense, net		17,578	13,097	44,966	37,895
Equity in (earnings) losses of unconsolidated affiliates		(7,399)	6	(15,105)	(3,549)
Other income, net		(4,677)	(971)	(4,102)	(12,803)
Income before income taxes		107,579	95,346	314,330	132,417
Provision for income taxes		(43,378)	(38,816)	(126,170)	(54,331)
Net income		64,201	56,530	188,160	78,086
Net income attributable to non-controlling interests		449	253	1,770	414
Net income attributable to MasTec, Inc.	[1]	$ 63,752	$ 56,277	$ 186,390	$ 77,672
Earnings per share (Note 2):
Basic earnings per share (in dollars per share)		$ 0.79	$ 0.70	$ 2.31	$ 0.97
Basic weighted average common shares outstanding		80,953	80,462	80,859	80,323
Diluted earnings per share (in dollars per share)		$ 0.77	$ 0.69	$ 2.27	$ 0.96
Diluted weighted average common shares outstanding		82,386	81,545	82,281	81,241

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

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Condensed Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 64,201	$ 56,530	$ 188,160	$ 78,086
Other comprehensive income:
Foreign currency translation gains (losses), net of tax	641	(1,454)	2,415	4,417
Unrealized gains (losses) on equity investee activity, net of tax	808	(345)	(1,287)	(12,932)
Comprehensive income	65,650	54,731	189,288	69,571
Comprehensive income attributable to non-controlling interests	449	253	1,770	414
Comprehensive income attributable to MasTec, Inc.	$ 65,201	$ 54,478	$ 187,518	$ 69,157

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Condensed Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 43,822	$ 38,767
Accounts receivable, net	1,534,790	1,156,031
Inventories, net	84,460	111,031
Prepaid expenses	53,832	41,548
Other current assets	30,843	55,109
Total current assets	1,747,747	1,402,486
Property and equipment, net	691,430	549,084
Goodwill, net	1,135,450	995,874
Other intangible assets, net	195,454	179,711
Other long-term assets	172,094	55,977
Total assets	3,942,175	3,183,132
Current liabilities:
Current portion of long-term debt	86,547	64,600
Accounts payable	457,213	363,668
Accrued salaries and wages	119,553	67,126
Other accrued expenses	128,769	112,291
Billings in excess of costs and earnings	111,898	161,459
Other current liabilities	98,171	70,846
Total current liabilities	1,002,151	839,990
Long-term debt	1,192,311	961,379
Deferred income taxes	274,465
Deferred income taxes		178,355
Other long-term liabilities	170,203	99,774
Total liabilities	2,639,130	2,079,498
Commitments and contingencies (Note 14)
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 - 90,843,339 and 90,634,771 (including 1,790,632 and 1,927,286 of unvested restricted shares) as of September 30, 2017 and December 31, 2016, respectively	9,084	9,063
Capital surplus	800,297	788,914
Retained earnings	696,331	509,941
Accumulated other comprehensive loss	(64,686)	(65,814)
Treasury stock, at cost: 8,094,004 shares as of both September 30, 2017 and December 31, 2016	(145,573)	(145,573)
Total MasTec, Inc. shareholders’ equity	1,295,453	1,096,531
Non-controlling interests	7,592	7,103
Total equity	1,303,045	1,103,634
Total liabilities and equity	$ 3,942,175	$ 3,183,132

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Condensed Unaudited Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
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	90,843,339	90,634,771
Treasury stock, shares	8,094,004	8,094,004
Unvested Restricted Shares [Member] | Common Stock [Member]
Unvested restricted shares (in shares)	1,790,632	1,927,286

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Condensed Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 188,160	$ 78,086
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	138,384	122,249
Non-cash interest expense, net	2,375	2,209
Non-cash stock-based compensation expense	10,551	11,291
Provision for (benefit from) deferred income taxes	92,188	(1,339)
Equity in earnings of unconsolidated affiliates	(15,105)	(3,549)
(Gains) losses on sales of assets, net, including fixed assets held-for-sale	(3,335)	378
Other non-cash items, net	14,920	1,951
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(334,383)	(302,590)
Inventories	33,579	(18,900)
Other assets, current and long-term portion	(61,900)	48,032
Accounts payable and accrued expenses	132,963	172,731
Billings in excess of costs and earnings	(54,199)	16,581
Book overdrafts	(4,603)	8,883
Other liabilities, current and long-term portion	39,030	(8,872)
Net cash provided by operating activities	178,625	127,141
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(115,995)	(4,102)
Capital expenditures	(83,330)	(89,050)
Proceeds from sale of property and equipment	13,585	6,824
Payments for other investments	(77,105)	(8,858)
Proceeds from other investments	13,416	1,125
Net cash used in investing activities	(249,429)	(94,061)
Cash flows from financing activities:
Proceeds from credit facilities	2,002,430	1,186,816
Repayments of credit facilities	(1,840,409)	(1,149,930)
Repayments of other borrowings	(12,080)	(8,188)
Payments of capital lease obligations	(48,748)	(41,828)
Payments of acquisition-related contingent consideration	(18,843)	(19,822)
Distributions to non-controlling interests	(1,280)	0
Proceeds from stock-based awards, net	853	3,938
Other financing activities, net	(6,301)	1,385
Net cash provided by (used in) financing activities	75,622	(27,629)
Effect of currency translation on cash	237	(1,008)
Net increase in cash and cash equivalents	5,055	4,443
Cash and cash equivalents - beginning of period	38,767	4,984
Cash and cash equivalents - end of period	43,822	9,427
Supplemental cash flow information:
Interest paid	47,163	40,433
Income taxes paid, net of refunds	77,533	15,141
Equipment acquired under capital lease and financing arrangements	129,567	13,015
Accrued capital expenditures	1,345	4,119
Earn-Out Arrangements [Member]
Acquisition-related contingent consideration, new business combinations	$ 89,614	$ 0

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Business, Basis of Presentation and Significant Accounting Policies

9 Months Ended

Sep. 30, 2017

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, install-to-the-home and customer fulfillment activities; petroleum and natural gas pipeline infrastructure; electrical utility transmission and distribution; power generation; heavy civil; 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, 2016 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, 2016 contained in the Company’s 2016 Annual Report on Form 10-K (the “2016 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.

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. All significant intercompany balances and transactions have been eliminated in consolidation. Other parties’ interests in entities that MasTec consolidates 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 for 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, or, for investments in a net liability position, within other long-term liabilities. Income or loss from these investments is recorded as a separate line item in the statements of operations. Intercompany profits or losses associated with the Company’s equity method investments are eliminated until realized by the investee in transactions with third parties. For equity investees in which the Company has an undivided interest in the assets, liabilities and profits or losses of an unincorporated entity, but the Company does not exercise control over the entity, the Company consolidates its proportional interest in the accounts of the entity. The cost method is used for investments in entities for which the Company does not have the ability to exert significant influence.

Management determines whether each business entity in which it has equity interests, debt, or other investments constitutes a variable interest entity (“VIE”) based on the nature and characteristics of such arrangements. If an investment arrangement is determined to be a VIE, then management determines if the Company is the VIE’s primary beneficiary by evaluating several factors, including the Company’s: (i) risks and responsibilities; (ii) ownership interests; (iii) decision making powers; and (iv) financial interests, among other factors. If management determines the Company is the primary beneficiary of a VIE, then it would be consolidated, and other parties’ interests in the VIE would be accounted for as non-controlling interests. 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. As of September 30, 2017, the Company determined that certain of its investment arrangements were VIEs; however, because it does not have the power to direct the primary activities that most significantly impact the economic performance of these VIEs, the Company is not the primary beneficiary, and accordingly, has not consolidated these VIEs.

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 their local currency as their functional currency. Currency gains or losses resulting from transactions executed in currencies other than the functional currency are included in other income or expense, net. In these condensed unaudited consolidated financial statements, “$” means U.S. dollars unless otherwise noted.

Management Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires the use of estimates and assumptions that affect the amounts reported in the consolidated 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 project-related depreciation), in particular, on construction contracts accounted for under the percentage-of-completion method, for which the recorded amounts require estimates of costs to complete and the amount of probable contract price adjustments; allowances for doubtful accounts; estimated fair values of goodwill and intangible assets; acquisition-related contingent consideration and investments in equity investees; asset lives used in computing depreciation and amortization; fair values of financial instruments; accrued self-insured claims; share-based compensation; other accruals and allowances; accounting for income taxes; and the estimated impact of litigation and other contingencies. While management believes that such estimates are reasonable when considered in conjunction with the Company’s consolidated financial position and results of operations taken as a whole, actual results could differ materially from those estimates.

Significant Accounting Policies

Revenue Recognition

Revenue is derived from construction projects performed under master and other service agreements as well as from 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 services under unit price or fixed price master service or other service agreements. 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 32% and 38% of consolidated revenue for the three month periods ended September 30, 2017 and 2016, respectively, and totaled 35% and 43% for the nine month periods ended September 30, 2017 and 2016, respectively. 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. 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 project managers, engineers and financial professionals. Management reviews estimates of contract revenue and costs on an ongoing basis. Changes in job performance, job conditions and management’s assessment of expected contract settlements are factors that influence estimates of total contract value and total 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. For both the nine month periods ended September 30, 2017 and 2016, project profit was affected by less than 5% as a result of changes in contract estimates included in projects that were in process as of December 31, 2016 and 2015. 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 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 such costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, and defers costs 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, 2017 and December 31, 2016, the Company had approximately $77 million and $17 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 earned and that management believes is probable of collection. As of both September 30, 2017 and December 31, 2016, these change orders were primarily related to contracts in the Oil and Gas segment. The Company actively engages in substantive meetings with its customers to complete the final approval process, and generally 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 Earnings (“BIEC”) on uncompleted contracts is classified within current liabilities. Costs and Earnings In Excess of Billings (“CIEB”), which is also referred to as work in process, is classified within current assets. Work in process on contracts is based on work performed but not yet billed to customers as per individual contract terms.

Recently Issued Accounting Pronouncements

There have been no changes in the expected dates of adoption or estimated effects on the Company’s consolidated financial statements of recently issued accounting pronouncements from those disclosed in the Company’s 2016 Form 10-K. See below for additional discussion of recently issued accounting pronouncements.

Accounting Pronouncements Not Yet Adopted

In August 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”)2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”). ASU 2017-12 amends the hedge accounting model in Topic 815 to enable entities to better portray the economics of their risk management activities in the financial statements and enhance the transparency and understandability of hedge results. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. The guidance also simplifies certain documentation and assessment requirements. ASU 2017-12 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. All transition requirements and elections should be applied to hedging relationships existing on the date of adoption and their effects should be reflected as of the beginning of the fiscal year of adoption. The presentation and disclosure requirements are effective on a prospective basis. The Company is currently evaluating the potential effect of this ASU on its consolidated financial statements.

In May 2017, FASB issued ASU 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting (“ASU 2017-09”). ASU 2017-09 clarifies when a change to the terms or conditions of a share-based payment award must be accounted for as a modification. Limited and administrative modifications that do not change the value, vesting conditions, or classification of the award are exempt from following the modification guidance in Topic 718. ASU 2017-09 is effective on a prospective basis for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted. The Company does not expect the adoption of this ASU to have a material effect on its consolidated financial statements.

In February 2017, the FASB issued ASU 2017-05, Other Income- Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets(“ASU 2017-05”). ASU 2017-05 clarifies certain guidance under Subtopic 610-20 that was issued as part of the new revenue standard, including the recognition of gains and losses on the sale or transfer of nonfinancial assets to noncustomers, and clarifies accounting for contributions of nonfinancial assets to joint ventures, among other requirements. ASU 2017-05 is effective on a retrospective basis for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted. The Company is currently evaluating the potential effect of this ASU 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 judgment and make estimates when evaluating contract terms and other relevant facts and circumstances. Additionally, ASU 2014-09 requires enhanced disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. 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 full retrospective or modified retrospective transition approach for fiscal years, and for interim periods within those years, beginning after December 15, 2017. In 2016, the FASB issued several accounting standards updates to clarify certain topics within ASU 2014-09. The Company will adopt ASU 2014-09, and its related clarifying ASUs, as of January 1, 2018.

The Company has substantially completed its assessment of the potential effects of these ASUs on its consolidated financial statements, business processes, systems and controls.  The Company’s assessment included a detailed review of representative contracts at each of the Company’s business units and a comparison of its historical accounting policies and practices to the new standard. Based on the Company’s review of various types of revenue arrangements, the Company expects to recognize revenue and earnings over time utilizing the cost-to-cost measure of progress for its fixed price contracts and certain master service and other service agreements, consistent with current practice.  For these contracts, the cost-to-cost measure of progress best depicts the transfer of control of goods or services to the customer under the new standard. The Company has substantially completed its analysis of the information necessary to enable the preparation of the financial statements and related disclosures under the new standard. As part of this analysis, the Company evaluated its information technology capabilities and systems, and does not expect to incur significant information technology costs to modify systems currently in place. The Company will implement targeted changes to its internal reporting processes to facilitate gathering the data needed for reporting and disclosure under the new standard. The Company will also implement updates to its control processes and procedures, as necessary, based on changes resulting from the new standard. The Company does not expect any such updates to materially affect the Company’s internal controls over financial reporting.

The Company anticipates adopting the standard using the modified retrospective transition approach.  Under this approach, the new standard would apply to all new contracts initiated on or after January 1, 2018.  For existing contracts that have remaining obligations as of January 1, 2018, any difference between the recognition criteria in these ASUs and the Company’s current revenue recognition practices would be recognized using a cumulative effect adjustment to the opening balance of retained earnings.  Any potential effect of adoption of these ASUs has not yet been quantified; however, based on the review of contracts across all of the Company’s business units to date, the adoption of these ASUs is not expected to have a material effect on the timing or amount of revenue recognized as compared to current practices.  The Company is training its business units for the implementation of the new standard, and continues developing the disclosures required by the new standard. The Company is also reviewing certain contracts entered into by its business units subsequent to its initial assessment that are expected to have performance obligations remaining as of January 1, 2018 for any cumulative effect adjustments that may be required upon adoption.

Accounting Pronouncements Adopted as of January 1, 2017

The Company adopted ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”) effective January 1, 2017. Under ASU 2016-09, excess tax benefits (“windfalls”) or tax deficiencies (“shortfalls”) are recognized in the income statement, rather than as additional paid-in-capital as under the previous guidance, and are presented as operating cash flows, rather than as a financing activity. This ASU also increased the amount of tax that can be withheld by an employer for employee tax withholdings without resulting in liability classification of an award. Payments to taxing authorities for such employee withholdings are presented as financing activities. ASU 2016-09 also allows companies to account for forfeitures of share-based payments as they occur or to estimate such amounts. The provisions of ASU 2016-09 that were applicable to the Company were adopted on a prospective basis; the retrospective requirement to classify payments to taxing authorities for employee withholdings as a financing activity was consistent with the Company’s existing methodology, therefore did not result in a change. The adoption of ASU 2016-09 is expected to result in volatility in income tax expense given that windfalls or shortfalls are recognized in income tax expense in the periods in which they occur. The other components of this ASU did not have a material effect on the consolidated financial statements. See Note 2 - Earnings Per Share, Note 9 - Stock-Based Compensation and Other Employee Benefit Plans and Note 12 - Income Taxes for additional information.

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Earnings Per Share

9 Months Ended

Sep. 30, 2017

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 attributable to MasTec by the weighted average number of common shares outstanding for the period, which excludes non-participating unvested restricted share awards. Diluted earnings per share is computed by dividing net income attributable to MasTec by the weighted average number of fully diluted shares, as calculated under the treasury stock method, which includes the potential effect of dilutive common stock equivalents, such as issued but unvested restricted shares and/or outstanding but unexercised stock options. The Company has no remaining outstanding stock options; all options under the Company’s stock option grants were exercised in 2016. If the Company reports a loss, rather than income, the computation of diluted loss per share excludes the effect of dilutive common stock equivalents, as their effect would be anti-dilutive.

As discussed in Note 1 - Business, Basis of Presentation and Significant Accounting Policies, the Company adopted ASU 2016-09 effective January 1, 2017 on a prospective basis. ASU 2016-09 changed the recognition of excess tax benefits or tax deficiencies upon the vesting of share-based payment awards from additional paid-in capital, within equity, to income tax benefit or expense, within the statement of operations. As a result, excess tax benefits or deficiencies under ASU 2016-09 are excluded from assumed proceeds under the treasury stock method. Previously, excess tax benefits or tax deficiencies were included within assumed proceeds. For both the three and nine month periods ended September 30, 2017, this resulted in the inclusion of approximately 0.3 million incremental shares in the Company’s total weighted average diluted shares outstanding.

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
	2017		2016		2017		2016
Net income attributable to MasTec:
Net income - basic and diluted (a)	$	63,752	$	56,277	$	186,390	$	77,672
Weighted average shares outstanding:
Weighted average shares outstanding - basic	80,953		80,462		80,859		80,323
Dilutive common stock equivalents	1,433		1,083		1,422		918
Weighted average shares outstanding - diluted	82,386		81,545		82,281		81,241
Additional information:
Weighted average anti-dilutive common stock equivalents (b)	—		1		12		—

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

(b) Represents anti-dilutive common stock equivalents as calculated under the treasury stock method.

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Goodwill and Other Intangible Assets

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Note 3 - Goodwill and Other Intangible Assets

The following table provides details of goodwill by reportable segment as of September 30, 2017 (in millions):

	Communications		Oil and Gas			Electrical Transmission		Power Generation and Industrial		Total Goodwill
Goodwill, gross	$	462.4	$	461.6		$	149.9	$	137.0	$	1,210.9
Accumulated impairment losses	—		(75.4		)	—		—		(75.4		)
Goodwill, net	$	462.4	$	386.2		$	149.9	$	137.0	$	1,135.5

For the nine month period ended September 30, 2017, additions to goodwill from new business combinations totaled $135.3 million. Currency translation effects related to goodwill and accumulated impairment losses totaled approximately $9.8 million of gains and $5.4 million of losses, respectively, for the nine month period ended September 30, 2017. For the nine month period ended September 30, 2016, additions to goodwill from accruals of acquisition-related contingent consideration totaled $5.8 million, and currency translation effects related to goodwill and accumulated impairment losses totaled $6.0 million of gains and $3.1 million of losses, respectively.

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, as of December 31, 2016	$	34.5	$	74.6	$	195.1		$	19.1		$	323.3
Accumulated amortization					(131.9		)	(11.7		)	(143.6		)
Other intangible assets, net, as of December 31, 2016	$	34.5	$	74.6	$	63.2		$	7.4		$	179.7
Additions from new business combinations	—		—		24.4			2.4			26.8
Amortization expense					(13.9		)	(1.1		)	(15.0		)
Currency translation adjustments	—		3.4		0.5			0.1			4.0
Other intangible assets, net, as of September 30, 2017	$	34.5	$	78.0	$	74.2		$	8.8		$	195.5

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

Amortization expense associated with intangible assets for the three month periods ended September 30, 2017 and 2016 totaled $6.0 million and $5.2 million, respectively, and for the nine month periods ended September 30, 2017 and 2016, totaled $15.0 million and $15.7 million, respectively.

2017 Acquisitions.During the nine month period ended September 30, 2017, MasTec completed three acquisitions, including (i) a wireline/fiber deployment construction contractor, which is included in the Company’s Communications segment; (ii) a heavy civil construction services company, which is included in the Company’s Power Generation and Industrial segment, and (iii) an oil and gas pipeline equipment company, which is included in the Company’s Oil and Gas segment. Determination of the estimated fair values of the net assets acquired and the estimated earn-out liabilities for these acquisitions is preliminary as of September 30, 2017, and further adjustments to management’s preliminary estimates may occur.

The following table summarizes the estimated fair values of consideration paid and identifiable assets acquired and liabilities assumed as of the respective dates of acquisition (in millions).

Acquisition consideration:	2017
Cash	$	118.8
Fair value of contingent consideration (earn-out liability)	89.6
Total consideration transferred	$	208.4
Identifiable assets acquired and liabilities assumed:
Current assets, primarily composed of accounts receivable and $2.8 million of cash acquired	$	42.7
Property and equipment	56.9
Amortizing intangible assets	26.8
Other long-term assets	0.5
Current liabilities, including current portion of capital lease obligations and long-term debt	(28.4		)
Long-term debt, including capital lease obligations	(9.9		)
Deferred income taxes	(15.5		)
Total identifiable net assets	$	73.1
Goodwill	$	135.3
Total net assets acquired, including goodwill	$	208.4

Amortizing intangible assets related to the 2017 acquisitions are primarily composed of customer relationships, backlog and other amortizing intangible assets, which had weighted average lives of approximately 11 years, 4 years and 7 years, respectively, and 10 years in total, and will be amortized in a manner consistent with the pattern in which the related benefits are expected to be consumed. The goodwill balances for the respective acquisitions represent the estimated value of each acquired company’s geographic presence in key markets, their assembled workforce, and management team industry-specific project management expertise, as well as synergies expected to be achieved from the combined operations of the acquired companies and MasTec. Approximately $75 million of the acquired goodwill balance as of September 30, 2017 is expected to be tax deductible.

The contingent consideration included in the table above equals the acquired companies’ earnings before interest, taxes, depreciation and amortization (“EBITDA”) above certain thresholds, if applicable, for a period of five years, as set forth in the respective purchase agreements, which amounts are payable annually.The fair values of the earn-out liabilities were estimated using income approaches such as discounted cash flows or option pricing models and incorporate significant inputs not observable in the market. Key assumptions in the estimated valuations 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.

For the three and nine month periods ended September 30, 2017, pro forma revenue totaled approximately $1,955.8 million and $5,077.4 million, respectively, and pro forma net income totaled approximately $64.4 million and $192.0 million, respectively. For the three and nine month periods ended September 30, 2016, pro forma revenue totaled approximately $1,634.5 million and $3,934.6 million, respectively, and pro forma net income totaled approximately $59.0 million and $81.5 million, respectively.

The above indicated unaudited pro forma financial results, which represent the results of operations of the companies acquired as if the acquired companies had been consolidated as of January 1, 2016, are provided for illustrative purposes only and do not purport to be indicative of the actual results that would have been achieved by the combined companies for the periods indicated, or of the results that may be achieved by the combined companies in the future. The unaudited supplemental pro forma financial results have been prepared by adjusting the historical results of MasTec to include the historical results of the acquired businesses described above, and then adjusted (i) to remove acquisition costs; (ii) to increase amortization expense resulting from the acquired intangible assets; (iii) to increase interest expense as a result of the cash consideration paid; (iv) to reduce interest expense from debt repaid upon acquisition; and (iv) to eliminate the effect of intercompany transactions. Additionally, the unaudited supplemental pro forma financial results do not include adjustments to reflect other cost savings or synergies that may have resulted from these acquisitions. Future results may vary significantly due to future events and transactions, as well as other factors, many of which are beyond MasTec’s control.

For the three and nine month periods ended September 30, 2017, acquisition-related results included in the Company’s consolidated results of operations included revenue of approximately $62.2 million and $96.1 million, respectively, and net income of approximately $3.2 million and $4.7 million, respectively.

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Fair Value of Financial Instruments

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

Note 4 – 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, stock warrants, 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, accounts payable and other current liabilities approximate their fair values. Management believes the carrying values of notes and other receivables, cash collateral deposited with insurance carriers, deferred compensation plan assets and liabilities and outstanding balances on its credit facilities approximate their fair values.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

As of September 30, 2017 and December 31, 2016, financial instruments required to be measured at fair value on a recurring basis consisted primarily of acquisition-related contingent consideration, which represents the estimated fair value of future earn-outs payable for acquisitions of businesses (“ASC 805 contingent consideration”). ASC 805 contingent consideration is based on management estimates and entity-specific assumptions and is evaluated on an ongoing basis. As of September 30, 2017 and December 31, 2016, the fair value of the Company’s ASC 805 contingent consideration totaled $104.9 million and $45.8 million, respectively, of which $18.9 million and $21.8 million, respectively, was included within other current liabilities. The fair value of the Company’s ASC 805 contingent consideration is estimated using income approaches such as discounted cash flows or option pricing models and incorporates significant inputs not observable in the market.Key assumptions 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. As of September 30, 2017, the range of potential undiscounted earn-out liabilities was estimated to be between $15 million and $170 million; however, there is no maximum payment amount.

ASC 805 contingent consideration activity consists primarily of additions from new business combinations, payments of earn-out liabilities, changes in the expected fair value of future earn-out obligations, and, for earn-out liabilities denominated in foreign currencies, translation gains or losses. Fair value adjustments are recorded within other income or expense, and foreign currency translation activity is recorded within other comprehensive income or loss, as appropriate. For the three and nine month periods ended September 30, 2017, additions from new business combinations totaled $64.6 million and $89.6 million, respectively. There were no payments of ASC 805 contingent consideration for the three month period ended September 30, 2017, and payments totaled $18.8 million for the nine month period ended September 30, 2017. For the three and nine month periods ended September 30, 2016, payments totaled $5.3 million and $15.8 million, respectively. Foreign currency translation activity was de minimis for both the three and nine month periods ended September 30, 2017 and September 30, 2016. The Company recognized reductions in the expected fair value of future earn-out obligations totaling $3.0 million and $11.6 million for certain acquired businesses in the Communications and Electrical Transmission segments for the three and nine month periods ended September 30, 2017, respectively, and, during the first quarter of 2016, the Company recognized a net reduction in the expected fair value of future earn-out obligations of $2.3 million for certain of the Company’s western Canadian oil and gas businesses.

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 and debt.

As of both September 30, 2017 and December 31, 2016, the gross carrying amount of the Company’s 4.875% senior notes due 2023 (the “4.875% Senior Notes”) totaled $400 million. As of September 30, 2017 and December 31, 2016, 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 $407.0 million and $388.0 million, respectively.

Cost and Equity Investees. The Company’s cost and equity investees as of September 30, 2017 are primarily composed of: (i) the Company’s equity interests in Trans-Pecos Pipeline, LLC (“TPP”) and Comanche Trail Pipeline, LLC (“CTP,” and together with TPP, the “Waha JVs”); (ii) the Company’s interests in a pre-acquisition equity method investment of Pacer Construction Holdings Corporation and its affiliated operating companies (collectively, “Pacer”); (iii) a $15 million cost investment in Cross Country Infrastructure Services, Inc. (“CCI,” previously, Cross Country Pipeline Supply, Inc.); (iv) the Company’s interests in its proportionately consolidated non-controlled contractual joint ventures; (v) the Company’s equity interests in Pensare Acquisition Corp. (“Pensare”); and (vi) certain other cost and equity method investments. See Note 15 - Related Party Transactions.

The fair values of the Company’s cost and equity method investments are not readily observable. 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 investments as of September 30, 2017 or December 31, 2016. Cumulative undistributed earnings from equity method investees totaled $10.6 million as of September 30, 2017.

The Waha JVs. The Waha JVs own and operate two pipelines and a header system that transport natural gas to the Mexican border for export. These pipelines commenced operations in the first half of 2017. There were no equity or other contributions to these joint ventures for the three month period ended September 30, 2017, and for the nine month period ended September 30, 2017, equity and other contributions totaled $73.3 million. As collateral for its equity commitments in the Waha JVs, the Company has issued letters of credit (the “Equity LC Amount”), of which $19 million and $91 million, respectively, were outstanding as of September 30, 2017 and December 31, 2016. Equity in earnings related to the Company’s proportionate share of income from the Waha JVs, which is included within the Company’s Other segment, totaled approximately $7.4 million and $15.1 million for the three and nine month periods ended September 30, 2017, respectively. Equity in earnings from the Waha JVs for the nine month period ended September 30, 2016 was de minimis.

The Waha JVs are party to certain interest rate swaps. The Company reflects its proportionate share of any unrealized fair market value gains or losses from fluctuations in interest rates associated with these swaps within other comprehensive income or loss, as appropriate. For the three month period ended September 30, 2017, the Company’s proportionate share of unrecognized unrealized activity on these interest rate swaps was a gain of approximately $1.3 million or $0.8 million, net of tax, and for the nine month period, this activity was a loss of approximately $2.1 million, or $1.3 million, net of tax. For the three and nine month periods ended September 30, 2016, the Company’s proportionate share of unrecognized unrealized activity on these interest rate swaps was a loss of approximately $0.6 million and $21.1 million, respectively, or $0.3 million and $12.9 million, net of tax, respectively.

Certain subsidiaries of MasTec have provided pipeline construction services to the Waha JVs. For the three and nine month periods ended September 30, 2017, revenue recognized in connection with work performed for the Waha JVs, including intercompany eliminations, totaled $3.6 million and $255.2 million, respectively, and for the three and nine month periods ended September 30, 2016, totaled $80.9 million and $142.8 million, respectively. As of September 30, 2017 and December 31, 2016, related receivables, including retainage, net of BIEC, totaled $52.2 million and $71.2 million, respectively. As of September 30, 2017 and December 31, 2016, the Company’s net investment in the Waha JVs represented an asset totaling approximately $115 million and $6 million, respectively. The Company’s net investment in the Waha JVs differs from its proportionate share of the net assets of the Waha JVs due to capitalized investment costs as well as the effect of intercompany eliminations.

Other investments. In connection with the 2014 acquisition of Pacer, the Company acquired equity interests in two joint ventures. There are no remaining amounts expected to be advanced in connection with these investments, and as of March 2016, all related project work had been completed. In the first quarter of 2016, revenue recognized by Pacer on behalf of these entities totaled $0.6 million. One of these entities was liquidated in 2016, and the second, which is in the final stages of liquidation, is being managed by a receiver to assist with the orderly wind-down of its operations. In the first quarter of 2016, $3.6 million of income was recognized related to changes in expected recoveries from these investments. The Company received $12.1 million of proceeds from the receiver in the first quarter of 2017. The remaining investment, for which the Company now has minimal involvement, is reviewed regularly by corporate management for potential changes in expected recovery estimates, and, during the second quarter of 2017, the Company recorded $5.8 million of expense related to changes in expected recovery amounts from this investment. The aggregate net carrying value of this investment, which represents expected recoveries under the receivership arrangement, totaled $14.8 million and $31.4 million as of September 30, 2017 and December 31, 2016, respectively, which amounts are included within other current assets.

During the third quarter of 2017, the Company paid approximately $2.0 million for approximately 4% of the common stock of Pensare and warrants to purchase 2.0 million shares of Pensare common stock, which is a special purpose acquisition company focusing on transactions in the telecommunications industry. The shares of common stock purchased by MasTec are not transferable or salable until one year after Pensare successfully completes a business combination transaction, with limited exceptions, as specified in the agreement. The warrants purchased by MasTec are exercisable at a purchase price of $11.50 per share after Pensare successfully completes a business combination. Both the warrants and shares expire and/or are effectively forfeitable if Pensare does not successfully complete a business combination by February 1, 2019. The warrants, which are derivative financial instruments, and the shares, which are a cost method investment, are included within other long-term assets in the Company’s consolidated financial statements as of September 30, 2017. The fair value of the warrants, as determined based on Level 3 inputs, approximated their cost basis as of September 30, 2017. The fair value of the shares is not readily determinable due to the nature of the restrictions. José R. Mas, MasTec’s Chief Executive Officer, is a director of Pensare.

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Accounts Receivable, Net of Allowance

9 Months Ended

Sep. 30, 2017

Receivables [Abstract]

Accounts Receivable, Net of Allowance

Note 5 - 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, 2017			December 31, 2016
Contract billings	$	626.7		$	564.2
Retainage	287.6			268.6
Costs and earnings in excess of billings	629.5			331.6
Accounts receivable, gross	$	1,543.8		$	1,164.4
Less allowance for doubtful accounts	(9.0		)	(8.4		)
Accounts receivable, net	$	1,534.8		$	1,156.0

Retainage, which has been billed, but is not due until completion of performance and acceptance by customers, is 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 each of the three month periods ended September 30, 2017 and 2016 totaled $0.4 million, and for the nine month periods ended September 30, 2017 and 2016, totaled $1.1 million and $2.0 million, respectively.

The Company is party to non-recourse financing arrangements in the ordinary course of business, under which certain receivables are purchased by the customer’s bank in return for a nominal fee. These arrangements, under which amounts can vary based on levels of activity and changes in customer payment terms, improve the collection cycle time of the related receivables. The discount charge, which is included within interest expense, totaled approximately $2.1 million and $0.8 million, respectively, for the three month periods ended September 30, 2017 and 2016, and totaled approximately $4.7 million and $1.7 million, respectively, for the nine month periods ended September 30, 2017 and 2016.

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Property and Equipment, Net

9 Months Ended

Sep. 30, 2017

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

Note 6 - 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, 2017			December 31, 2016
Land	$	4.6		$	4.6
Buildings and leasehold improvements	25.7			24.2
Machinery and equipment	1,237.3			997.8
Office furniture and equipment	149.6			146.1
Construction in progress	8.9			9.5
Total property and equipment	$	1,426.1		$	1,182.2
Less accumulated depreciation and amortization	(734.7		)	(633.1		)
Property and equipment, net	$	691.4		$	549.1

The gross amount of capitalized internal-use software, which is included within office furniture and equipment, totaled $108.7 million and $107.8 million as of September 30, 2017 and December 31, 2016, respectively. Capitalized internal-use software, net of accumulated amortization, totaled $24.8 million and $30.9 million as of September 30, 2017 and December 31, 2016, respectively. Depreciation and amortization expense associated with property and equipment for the three month periods ended September 30, 2017 and 2016 totaled $44.1 million and $37.4 million, respectively, and totaled $123.4 million and $106.5 million for the nine month periods ended September 30, 2017 and 2016, respectively.

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Debt

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Debt

Note 7 - Debt

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

Description	Maturity Date	September 30, 2017			December 31, 2016
Senior secured credit facility:	February 22, 2022
Revolving loans		$	300.6		$	279.9
Term loan		400.0			237.5
4.875% Senior Notes	March 15, 2023	400.0			400.0
Capital lease obligations, weighted average interest rate of 3.5%	In installments through September 1, 2022	179.9			98.6
Notes payable and other debt obligations	Varies	12.1			19.8
Total long-term debt obligations		$	1,292.6		$	1,035.8
Less unamortized deferred financing costs		(13.8		)	(9.8		)
Total debt, net of deferred financing costs		$	1,278.8		$	1,026.0
Current portion of long-term debt		86.5			64.6
Long-term debt		$	1,192.3		$	961.4

Senior Secured Credit Facility

The Company has a senior secured credit facility (the “Credit Facility”), which was amended and restated on February 22, 2017. The Company refers to its amended and restated credit facility as the “2017 Credit Facility,” and to its previous credit facility as the “2016 Credit Facility.” The 2017 Credit Facility increased the Company’s aggregate borrowing commitments from approximately $1.2 billion to $1.5 billion, which amount is composed of $1.1 billion of revolving commitments and a term loan in the aggregate principal amount of $400 million. The amended and restated credit facility also extended the Credit Facility’s maturity date to February 22, 2022. As of September 30, 2017, term loans in the aggregate principal amount of $400 million were drawn under the 2017 Credit Facility. The term loan is subject to amortization in quarterly principal installments that commence in December 2017, which as of September 30, 2017, amounted to $3.1 million, which amount is subject to adjustment for additional term loans and, if applicable, for certain prepayments. As of December 31, 2016, term loans in the aggregate principal amount of $238 million were outstanding.

The 2017 Credit Facility also increased the amount the Company can borrow either in Canadian dollars and/or Mexican pesos up to an aggregate equivalent amount of $300 million. The maximum amount available for letters of credit under the 2017 Credit Facility is $650 million, of which up to $200 million can be denominated in either Canadian dollars and/or Mexican pesos. The Credit Facility also provides for swing line loans of up to $75 million, and, subject to certain conditions, the Company has the option to increase revolving commitments and/or establish additional term loan tranches up to an aggregate amount of $250 million. Subject to the terms and conditions described in the Credit Facility, these additional term loan tranches may rank equal or junior in respect of right of payment and/or collateral to the Credit Facility, and may have terms and pricing that differ from the 2017 Credit Facility. Borrowings under the Credit Facility are used for working capital requirements, capital expenditures and other corporate purposes, including investments in equity or other investees, potential acquisitions or other strategic arrangements, and the repurchase or prepayment of indebtedness.

Outstanding revolving loans and the term loan under the Credit Facility bear interest, at the Company’s option, at a rate equal to either (a) a Eurocurrency Rate, as defined in the 2017 Credit Facility, plus a margin of 1.25% to 2.00% (under the 2016 Credit Facility, the margin was from 1.00% to 2.00%), or (b) a Base Rate, as defined in the 2017 Credit Facility, plus a margin of 0.25% to 1.00% (under the 2016 Credit Facility, the margin was from 0.00% to 1.00%). The Base Rate equals the highest of (i) the Federal Funds Rate, as defined in the Credit Facility, plus 0.50%, (ii) Bank of America’s prime rate, and (iii) the Eurocurrency Rate plus 1.00%.Financial standby letters of credit and commercial letters of credit issued under the 2017 Credit Facility are subject to a letter of credit fee of 1.25% to 2.00% (under the 2016 Credit Facility, the letter of credit fee was from 1.00% to 2.00%), and performance standby letters of credit are subject to a letter of credit fee of 0.50% to 1.00% under the Credit Facility.The Company must also pay a commitment fee to the lenders of 0.20% to 0.40% on any unused availability under the Credit Facility. In each of the foregoing cases, the applicable margin or fee is based on the Company’s Consolidated Leverage Ratio, as defined in the Credit Facility, as of the then most recent fiscal quarter.

As of September 30, 2017 and December 31, 2016, outstanding revolving loans, which included $171 million and $119 million, respectively, of borrowings denominated in foreign currencies, accrued interest at weighted average rates of approximately 2.96% and 3.71% per annum, respectively. The term loan accrued interest at a rate of 2.86% and 2.77% as of September 30, 2017 and December 31, 2016, respectively. Letters of credit of approximately $189.1 million and $314.3 million were issued as of September 30, 2017 and December 31, 2016, respectively. As of September 30, 2017 and December 31, 2016, letters of credit fees accrued at 0.750% and 1.00% per annum, respectively, for performance standby letters of credit, and at 1.625% and 2.00% 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, 2017 and December 31, 2016, availability for revolving loans totaled $610.3 million and $405.9 million, respectively, or up to $460.9 million and $335.7 million, respectively, for new letters of credit. Revolving loan borrowing capacity included $129.4 million and $80.9 million of availability in either Canadian dollars or Mexican pesos as of September 30, 2017 and December 31, 2016, respectively. The unused facility fee as of September 30, 2017 and December 31, 2016 accrued at a rate of 0.30% and 0.40%, 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 requires that the Company maintain a Maximum Consolidated Leverage Ratio, as defined in the Credit Facility, of 3.50 (subject to the Acquisition Adjustment described below). The Credit Facility also requires that the Company maintain a Minimum Consolidated Interest Coverage Ratio, as defined in the Credit Facility, of 3.00. The Credit Facility provides that, for purposes of calculating the Consolidated Leverage Ratio, certain cash charges may be added back to the calculation of Consolidated EBITDA, as defined in the Credit Facility, and funded indebtedness excludes undrawn standby performance letters of credit. Additionally, notwithstanding the terms discussed above, subject to certain conditions, if a permitted acquisition or series of permitted acquisitions having consideration exceeding $50 million occurs during a fiscal quarter, the Consolidated Leverage Ratio may be temporarily increased to up to 3.75 during such fiscal quarter and the subsequent two fiscal quarters. Such right may be exercised no more than two times during the term of the Credit Facility. Subject to customary exceptions, the Credit Facility limits the borrowers’ and the Guarantor Subsidiaries’ ability to engage in certain activities, including acquisitions, mergers and consolidations, debt incurrence, investments, capital expenditures, asset sales, debt prepayments, lien incurrence and the making of distributions or repurchases of capital stock. However, distributions payable solely in capital stock are permitted. The Credit Facility provides for customary events of default and carries cross-default provisions with the Company’s other significant debt instruments, including the Company’s indemnity agreement with its surety provider, as well as customary remedies, including the acceleration of repayment of outstanding amounts and other remedies with respect to the collateral securing the Credit Facility obligations.

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 denominated in Canadian dollars. As September 30, 2017 and December 31, 2016, maximum borrowing capacity totaled Canadian $20.0 million and $40.0 million, respectively, or approximately $16.0 million and $29.8 million, respectively. As of September 30, 2017 and December 31, 2016, outstanding borrowings totaled approximately $5.4 million and $13.4 million, respectively, and accrued interest at a weighted average rate of approximately 4.0% and 3.6%, respectively. Outstanding borrowings that are not renewed are repaid with borrowings under the Company’s senior secured credit facility. Accordingly, the carrying amounts of the Company’s borrowings under its other credit facilities, which are included within notes payable and other debt obligations in the table above, 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.

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 Company’s Credit Facility or other outstanding indebtedness. See Note 16 - Supplemental Guarantor Condensed Unaudited Consolidating Financial Information.

MasTec was in compliance with the provisions and covenants of its outstanding debt instruments as of September 30, 2017 and December 31, 2016.

Additional Information

As of September 30, 2017 and December 31, 2016, accrued interest payable, which is recorded within other accrued expenses in the consolidated balance sheets, totaled $4.1 million and $8.5 million, respectively. Additionally, in connection with the 2017 Credit Facility amendment, the Company paid approximately $6 million in financing costs for the nine month period ended September 30, 2017. For additional information pertaining to the Company’s debt instruments, including its 4.875% Senior Notes, see Note 7 - Debt in the Company’s 2016 Form 10-K.

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Lease Obligations

9 Months Ended

Sep. 30, 2017

Leases [Abstract]

Lease Obligations

Note 8 - Lease Obligations

Capital Leases

MasTec enters into agreements that provide lease financing for machinery and equipment. The gross amount of assets held under capital leases as of September 30, 2017 and December 31, 2016, which are included within property and equipment, net, totaled $404.1 million and $294.9 million, respectively. Assets held under capital leases, net of accumulated depreciation, totaled $269.6 million and $177.5 million as of September 30, 2017 and December 31, 2016, 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. See Note 15 - Related Party Transactions. Rent and related expense for operating leases that have non-cancelable terms in excess of one year totaled approximately $25.4 million and $25.9 million for the three month periods ended September 30, 2017 and 2016, respectively, and totaled $77.6 million and $74.8 million for the nine month periods ended September 30, 2017 and 2016, respectively. The Company also incurred rent and related expense for facilities, vehicles and equipment having original terms of one year or less totaling approximately $159.4 million and $96.7 million for the three month periods ended September 30, 2017 and 2016, respectively, and totaling $347.8 million and $213.9 million for the nine month periods ended September 30, 2017 and 2016, respectively.

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Stock-Based Compensation and Other Employee Benefit Plans

9 Months Ended

Sep. 30, 2017

Share-based Compensation [Abstract]

Stock-Based Compensation and Other Employee Benefit Plans

Note 9 – Stock-Based Compensation and Other Employee Benefit Plans

The Company has stock-based compensation plans, under which shares of the Company’s common stock are reserved for issuance. Under all stock-based compensation plans in effect as of September 30, 2017, including employee stock purchase plans, there were approximately 4.9 million shares available for future grant. In March 2017, the Company’s board of directors adopted the Amended and Restated 2013 Incentive Compensation Plan (the “Amended 2013 ICP”), which was effective as of January 1, 2017 and changed the amount of tax the Company can withhold for employee tax withholdings on share-based awards, as provided under ASU 2016-09. The Company adopted ASU 2016-09 as of January 1, 2017, as discussed in Note 1 - Business, Basis of Presentation and Significant Accounting Policies.

Restricted Shares

MasTec grants restricted stock awards and restricted stock units (together “restricted shares”), which are valued based on the closing market share price of MasTec common stock (the “market price”) 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, 2017was approximately$15.8 million, which is expected to be recognized over a weighted average period of approximately1.1years. The intrinsic value of restricted shares that vested, which is based on the market price on the date of vesting, totaled $0.1 million for both the three month periods ended September 30, 2017 and 2016, and totaled $11.9 million and $1.5 million for the nine month periods ended September 30, 2017 and 2016, respectively.

Activity, restricted shares: (a)	Restricted Shares		Per Share Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2016	1,970,586		$	21.61
Granted	193,348		39.47
Vested	(304,211	)	40.72
Canceled/forfeited	(30,041	)	20.24
Non-vested restricted shares, as of September 30, 2017	1,829,682		$	20.34

(a) Includes 39,050 and 43,300 restricted stock units as of September 30, 2017 and December 31, 2016, respectively.

Stock Options

The Company previously granted options to purchase its common stock to employees and members of the Board of Directors and affiliates under various stock option plans. During 2016, all stock options that were outstanding under previous stock option grants were exercised. The intrinsic value of options exercised, which is based on the difference between the exercise price and the market share price of the Company’s common stock on the date of exercise, totaled $0.5 million and $1.8 million for the three and nine month periods ended September 30, 2016, respectively. Net of shares withheld in cashless option exercises, there were no proceeds from option exercises for the three month period ended September 30, 2016, and for the nine month period ended September 30, 2016, proceeds totaled $1.9 million.

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
	2017		2016
Cash proceeds (in millions)	$	2.4	$	2.0
Common shares issued	68,789		115,556
Weighted average price per share	$	34.72	$	16.88
Weighted average per share grant date fair value	$	9.00	$	4.58

Non-CashStock-Based Compensation Expense

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

	For the Three Months Ended September 30				For the Nine Months Ended September 30
	2017		2016		2017		2016
Non-cash stock-based compensation expense	$	3.4	$	3.9	$	10.5	$	11.3
Income Tax Effects:
Income tax effect of non-cash stock-based compensation	$	1.3	$	1.7	$	3.8	$	5.6
Excess tax benefit from non-cash stock-based compensation (a)	$	0.0	$	0.3	$	0.1	$	1.4

(a) Excess tax benefits represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with share-based payment arrangements. For the ninemonth period ended September 30, 2017, the Company incurred a net tax deficiency of $0.1 million related to the vesting of share-based payment awards and excess tax benefits were de minimis. As discussed in Note 1 - Business, Basis of Presentation and Significant Accounting Policies, the Company adopted ASU 2016-09 effective January 1, 2017 on a prospective basis. ASU 2016-09 changed the required presentation of excess tax benefits in the consolidated statement of cash flows from financing activities to operating activities. Excess tax benefits for the comparative prior year period are classified as cash flows from financing activities.

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Other Retirement Plans

9 Months Ended

Sep. 30, 2017

Multiemployer Plans [Abstract]

Other Retirement Plans

Note 10 – Other Retirement Plans

Multiemployer Plans. Certain of MasTec’s subsidiaries, including certain subsidiaries in Canada, contribute amounts to multiemployer pension and other multiemployer 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. Multiemployer 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 a 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 multiemployer 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:

	Multiemployer Plans
	Covered Employees		Contributions (in millions)
	Low	High	Pension		Other Multiemployer		Total
For the Three Months Ended September 30:
2017	3,669	7,057	$	36.7	$	2.7	$	39.4
2016	4,170	4,910	$	26.4	$	2.9	$	29.3
For the Nine Months Ended September 30:
2017	550	7,057	$	68.1	$	8.0	$	76.1
2016	1,112	4,910	$	43.4	$	7.6	$	51.0

The fluctuations in the average number of employees covered under multiemployer plans and related contributions in the table above are primarily related to higher levels of union resource-based project activity within the Company’s oil and gas operations.

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Equity

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Equity

Note 11 – Equity

Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss is composed of unrealized foreign currency translation gains and losses, which 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, and unrealized gains and losses from certain investment activities. For both the three and nine month periods ended September 30, 2017 and 2016, unrealized foreign currency activity related primarily to the Company’s Canadian operations, and unrealized investment activity related to interest rate swaps associated with the Waha JVs.

Share Activity

No shares of the Company’s common stock have been repurchased under the Company’s 2016 share repurchase program.

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Income Taxes

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Income Taxes

Note 12 - 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 three month period ended September 30, 2017, the Company recognized certain tax credits based upon the results of a study that is currently underway, which amount was determined based on management’s estimates and currently available information. Further adjustments to the amount recognized may occur as the results of the study are finalized, which is expected to occur in the fourth quarter of 2017.

As discussed in Note 1 - Business, Basis of Presentation and Significant Accounting Policies, effective January 1, 2017, the Company adopted ASU 2016-09, which changed the recognition requirements for excess tax benefits (“windfalls”) or tax deficiencies (“shortfalls”) from share-based payment awards. ASU 2016-09 requires windfalls or shortfalls to be recognized within income tax expense in the interim periods in which they occur, rather than as additional paid-in capital. Given that windfalls or shortfalls are recognized in income tax expense in the periods in which they occur, they are not included when estimating annual effective tax rates. The tax effect related to the vesting of share-based payment awards did not have a significant effect on the Company’s consolidated effective tax rate for the three and nine month periods ended September 30, 2017.

As of September 30, 2017, the Company had $274.5 million of long-term deferred tax liabilities. As of December 31, 2016, current deferred tax assets, net, totaled $11.8 million and long-term deferred tax liabilities, net, totaled $178.4 million. In addition, as of September 30, 2017 and December 31, 2016, accrued income and other taxes payable, which are included within other accrued expenses, totaled $19.8 million and $40.3 million, respectively. The Company adopted Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes (“ASU 2015-17”), which changed the classification requirements for deferred tax assets and liabilities, effective January 1, 2017. ASU 2015-17 requires long-term classification of all deferred tax assets and liabilities, rather than separately classifying deferred tax assets and liabilities based on their net current and non-current amounts, as was required under the previous guidance. The Company adopted ASU 2015-17 on a prospective basis, therefore prior periods were not adjusted to conform to the current period presentation. The adoption of ASU 2015-17 did not have had a material effect on the consolidated financial statements.

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Segments and Related Information

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Segments and Related Information

Note 13 - Segments and Related Information

Segment Discussion

MasTec manages its 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.

The Communications segment performs engineering, construction, maintenance and customer fulfillment activities related to communications infrastructure primarily for wireless and wireline/fiber communications and install-to-the-home customers, and, to a lesser extent, infrastructure for utilities, among others.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/biofuel facilities and various types of heavy civil and industrial infrastructure.The Other segment includes equity investees, the services of which vary from those provided by the Company’s four primary segments, as well as other small business units that perform construction and other services for a variety of international end-markets.

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 understand the Company’s financial results and assess its prospects for future performance. The Company uses EBITDA to evaluate its performance, both internally and as compared with its peers, because it excludes certain items that may not be indicative of the Company’s core operating results for its reportable segments, as well as items that can vary widely across different industries or among companies within the same industry, and for non-cash stock-based compensation expense, can also be subject to volatility from changes in the market price per share of our common stock or variations in the value of shares granted. Segment EBITDA is calculated in a manner consistent with consolidated EBITDA.

For the three and nine month periods ended September 30, 2017, Other segment EBITDA included project losses of $0.4 million and $7.4 million, respectively, from a proportionately consolidated non-controlled Canadian joint venture, which is managed by a third party, and for which we have minimal direct construction involvement. For both the three and nine month periods ended September 30, 2016, Other segment EBITDA included $5.1 million of project losses on this proportionately consolidated non-controlled Canadian joint venture. For the nine month period ended September 30, 2016, EBITDA for the Oil and Gas and Electrical Transmission segments included first quarter project losses of $13.5 million and $15.1 million, respectively.

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
Revenue:	2017			2016			2017			2016
Communications (a)	$	610.5		$	624.3		$	1,762.2		$	1,728.0
Oil and Gas	1,161.0			736.0			2,757.2			1,454.3
Electrical Transmission	81.8			101.7			277.3			283.6
Power Generation and Industrial	96.9			123.6			204.1			324.7
Other	10.6			7.6			14.2			14.9
Eliminations	(5.0		)	(7.0		)	(10.9		)	(12.7		)
Consolidated revenue	$	1,955.8		$	1,586.2		$	5,004.1		$	3,792.8

(a) Revenue generated primarily by utilities customers represented 13.0% and 11.1% of Communications segment revenue for the three month periods ended September 30, 2017 and 2016, respectively, and represented 12.6% and 10.9% for the nine month periods ended September 30, 2017 and 2016, respectively.

	For the Three Months Ended September 30						For the Nine Months Ended September 30
EBITDA:	2017			2016			2017			2016
Communications	$	65.3		$	62.8		$	173.2		$	190.9
Oil and Gas	108.1			117.8			356.1			187.6
Electrical Transmission	4.5			(8.3		)	11.2			(42.0		)
Power Generation and Industrial	9.3			6.1			14.8			13.8
Other	10.1			(3.1		)	11.6			(2.6		)
Corporate	(22.0		)	(24.3		)	(69.2		)	(55.1		)
Consolidated EBITDA	$	175.3		$	151.0		$	497.7		$	292.6

	For the Three Months Ended September 30				For the Nine Months Ended September 30
Depreciation and Amortization:	2017		2016		2017		2016
Communications	$	13.8	$	12.5	$	39.4	$	37.2
Oil and Gas	26.0		20.7		71.1		58.2
Electrical Transmission	5.8		6.1		17.3		17.1
Power Generation and Industrial	2.9		1.6		5.8		4.6
Other	0.0		0.0		0.1		0.0
Corporate	1.6		1.7		4.7		5.1
Consolidated depreciation and amortization	$	50.1	$	42.6	$	138.4	$	122.2

The following table, which may contain slight summation differences due to rounding, presents a reconciliation of consolidated income before income taxes to EBITDA (in millions):

	For the Three Months Ended September 30				For the Nine Months Ended September 30
EBITDA Reconciliation:	2017		2016		2017		2016
Income before income taxes	$	107.6	$	95.3	$	314.3	$	132.4
Plus:
Interest expense, net	17.6		13.1		45.0		37.9
Depreciation and amortization	50.1		42.6		138.4		122.2
Consolidated EBITDA	$	175.3	$	151.0	$	497.7	$	292.6

Foreign Operations. MasTec operates in North America, primarily in the United States and Canada, and, to a lesser extent, in Mexico. For the three month periods ended September 30, 2017 and 2016, revenue of $1.9 billion and $1.5 billion, respectively, was derived from U.S. operations, and revenue of $61.0 million and $73.8 million, respectively, was derived from foreign operations, the majority of which was from the Company’s Canadian operations. For the nine month periods ended September 30, 2017 and 2016, revenue of $4.8 billion and $3.6 billion, respectively, was derived from U.S. operations, and revenue of $160.7 million and $222.8 million, respectively, was derived from foreign operations, the majority of which was from the Company’s Canadian operations. The majority of the Company’s foreign operations during the three and nine month periods ended September 30, 2017 and 2016 were in the Company’s Oil and Gas segment. Long-lived assets held in the U.S. included property and equipment, net, of $629.2 million and $475.3 million as of September 30, 2017 and December 31, 2016, respectively, and, for the Company’s businesses in foreign countries, the majority of which are in Canada, totaled $62.2 million and $73.8 million, respectively. Intangible assets and goodwill, net, related to the Company’s U.S. operations totaled approximately $1.2 billion and $1.1 billion as of September 30, 2017 and December 31, 2016, respectively, and, for the Company’s businesses in foreign countries, the majority of which are in Canada, totaled approximately $114.3 million and $107.8 million as of September 30, 2017 and December 31, 2016, respectively. Amounts due from customers from which foreign revenue was derived accounted for approximately 6% and 8%, respectively, of the Company’s consolidated net accounts receivable position as of September 30, 2017 and December 31, 2016, which represents accounts receivable, net, less BIEC.

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
Customer:	2017	2016	2017	2016
Energy Transfer affiliates (a)	49%	35%	40%	26%
AT&T (including DIRECTV®) (b)	21%	30%	25%	34%

(a) The Company's relationship with Energy Transfer affiliates is based upon various construction contracts for pipeline activities with Energy Transfer Partners L.P., and their subsidiaries and affiliates, all of which are consolidated by Energy Transfer Equity, L.P. Revenue from Energy Transfer affiliates is included in the Oil and Gas segment.

(b) The Company’s relationship with AT&T is based upon multiple separate master service and other service agreements, including for installation and maintenance services, as well as construction/installation contracts for AT&T’s: (i) wireless business; (ii) wireline/fiber businesses; and (iii) various install-to-the-home businesses, including DIRECTV®. Revenue from AT&T is included in the Communications segment.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 14 - Commitments and Contingencies

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. See Note 14 - Commitments and Contingencies in the Company’s 2016 Form 10-K for additional information. 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 the Company. The outcome of such cases, claims and disputes 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.

Other Commitments and Contingencies

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 8 - Lease Obligations and Note 15 - Related Party Transactions.

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 as well as certain obligations associated with the Company’s cost and equity investees, including its variable interest entities. 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, 2017 and December 31, 2016, there were $189.1 million and $314.3 million, respectively, of letters of credit issued under the Company’s Credit Facility. The Company is not aware of material claims relating to its outstanding letters of credit as of September 30, 2017 or December 31, 2016.

Performance and Payment Bonds. In the ordinary course of business, MasTec is required by certain customers to provide performance and payment bonds for 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, 2017 and December 31, 2016, outstanding performance and payment bonds totaled $119.2 million and $72.9 million, respectively, and estimated costs to complete projects secured by these bonds totaled $51.3 million and $9.5 million as of September 30, 2017 and December 31, 2016, respectively. These amounts do not include performance and payment bonds associated with the Company’s equity investees.

Cost and Equity Investees and Other Entities. The Company holds a 35% undivided interest in a proportionately consolidated non-controlled Canadian contractual joint venture that was underway when the Company acquired Pacer in 2014, whose sole activity involves the construction of a bridge, a business in which the Company does not otherwise engage. This joint venture, which is managed by a third party, and for which the Company has minimal direct construction involvement, automatically terminates upon completion of the project. The Company also holds undivided interests, ranging from 85% to 90% in seven proportionately consolidated non-controlled contractual joint ventures that provide infrastructure construction services for electrical transmission projects. Income and/or losses incurred by these joint ventures are generally shared proportionally by the respective joint venture members, with the members of the joint ventures jointly and severally liable for all of the obligations of the joint venture. The respective joint venture agreements provide 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 partners fail or refuse to pay or perform their respective share of the obligations. As of September 30, 2017, the Company was not aware of circumstances that would reasonably lead to material future claims against it in connection with these arrangements.

The Company has other investment arrangements, as discussed in Note 4 - Fair Value of Financial Instruments and Note 15 - Related Party Transactions. From time to time, the Company may incur costs or provide financing, performance, financial and/or other guarantees to or in connection with its investees.

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, 2017 and December 31, 2016, MasTec’s liability for unpaid claims and associated expenses, including incurred but not reported losses related to these policies, totaled $98.5 million and $85.8 million, respectively, of which $67.5 million and $55.2 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 totaled $2.6 million as of both September 30, 2017 and December 31, 2016.

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 $84.6 million and $85.1 million as of September 30, 2017 and December 31, 2016, respectively. In addition, cash collateral deposited with insurance carriers, which is included within other long-term assets, amounted to $1.5 million for these policies as of both September 30, 2017 and December 31, 2016. Outstanding surety bonds related to workers’ compensation self-insurance programs amounted to $13.7 million and $13.5 million as of September 30, 2017 and December 31, 2016, respectively.

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 Multiemployer Plans. As discussed in Note 10 - Other Retirement Plans, certain of MasTec’s subsidiaries are party to various collective bargaining agreements with unions representing certain of their employees, which require the Company to pay specified wages, provide certain benefits to their union employees and contribute certain amounts to multiemployer pension and other multiemployer benefits plans and trusts. The Employee Retirement Income Security Act of 1974, as amended by the Multiemployer Pension Plan Amendments Act of 1980 (collectively, “ERISA”), which governs U.S.-registered multiemployer 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. 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. As described in the Company’s 2016 Form 10-K, the Company, along with other members of the Pipe Line Contractors Association (the “PLCA”), voluntarily withdrew from the Central States Southeast and Southwest Areas Pension Fund (“Central States”) in November 2011, for which the Company established and paid a $6.4 million withdrawal liability. The Company is in arbitration to determine if there is any remaining amount owed on this withdrawal liability, and during the third quarter of 2017, the Company recognized $0.6 million of expense in connection with the expected settlement of this matter.

Other than the Company’s 2011 withdrawal from Central States and certain other underfunded plans, as described in the Company’s 2016 Form 10-K, the Company does not have plans to withdraw from, and is not aware of circumstances that would reasonably lead to material claims against it in connection with these plans. However, there can be no assurance that the Company will not be assessed liabilities in the future.

Based upon the information available to the Company from plan administrators as of September 30, 2017, several of the multiemployer pension plans in which it participates are underfunded and, as a result, the Company could be required to increase its contributions, including in the form of a surcharge on future benefit contributions. 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 these plans, investment returns and the level of underfunding of such plans.

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, 2017 and December 31, 2016, the Company was not aware of any 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 certain of its equity investees. MasTec also generally warrants the work it performs for a one to two year period following substantial completion of a project. Much of the work performed by the Company is evaluated for defects shortly after the work is completed. Accrued warranty claims are, and historically have been, de minimis. However, if warranty claims occur, the Company could be required to repair or replace warrantied items, or, if customers elect to repair or replace the warrantied item using the services of another provider, the Company could be required to pay for the cost of the repair or replacement.

Concentrations of Risk. The Company had approximately 455 customers for the nine month period ended September 30, 2017. As of September 30, 2017 and December 31, 2016, one customer accounted for approximately 44% and 24%, respectively, of the Company’s consolidated net accounts receivable position, which represents accounts receivable, net, less BIEC. As of September 30, 2017 and December 31, 2016, a separate customer accounted for approximately 13% and 17%, respectively, of the Company’s consolidated net accounts receivable position. In addition, the Company derived 83% and 80%, respectively, of its revenue from its top ten customers for the three month periods ended September 30, 2017 and 2016, and derived 80% and 76% of its revenues, respectively, from its top ten customers for the nine month periods ended September 30, 2017 and 2016.

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Related Party Transactions

9 Months Ended

Sep. 30, 2017

Related Party Transactions [Abstract]

Related Party Transactions

Note 15 - Related Party Transactions

For the three month periods ended September 30, 2017 and 2016, revenue recognized by the Company’s Pacer subsidiary for work performed for a contractual joint venture in which it holds a 35% undivided interest totaled $0.6 million and $0.2 million, respectively, and for the nine month periods ended September 30, 2017 and 2016, totaled $0.9 million and $0.8 million, respectively. As of September 30, 2017 and December 31, 2016, receivables from this contractual joint venture totaled $0.9 million and $0.7 million, respectively. Related performance guarantees, which are based on the original full contract value, as of both September 30, 2017 and December 31, 2016, totaled Canadian $132.1 million (or approximately $105.9 million and $98.3 million, respectively). In connection with this contractual joint venture, the Company provided project-related financing of $2.7 million and $5.9 million, respectively, for the three and nine month periods ended September 30, 2017, and $0.8 million and $5.6 million, respectively, for the three and nine month periods ended September 30, 2016. As of September 30, 2017, there were no additional amounts committed to this entity.

In connection with an April 2017 acquisition, the Company acquired a 40% interest in an entity, valued at $0.4 million, which is accounted for as an equity method investment. The Company has a subcontracting arrangement with this entity. For the nine month period ended September 30, 2017, the Company incurred $0.2 million of expenses under this subcontracting arrangement, and there were no amounts outstanding as of September 30, 2017. During the nine month period ended September 30, 2017, the Company advanced $0.3 million to this entity, net, of which $0.3 million was outstanding as of September 30, 2017. The acquired company had a vendor financing arrangement with an entity that was owned by a member of subsidiary management, which arrangement was completed in the third quarter of 2017. The payments made under this arrangement for the three and nine month periods ended September 30, 2017 totaled $1.4 million and $5.3 million, respectively, and no amounts were outstanding as of September 30, 2017.

MasTec purchases, rents and leases equipment used in its business from a number of different vendors on a non-exclusive basis, including CCI, in which the Company has a cost method investment. Juan Carlos Mas, who is the brother of Jorge Mas, Chairman of MasTec’s Board of Directors, and José R. Mas, serves as the chairman of CCI. For the three month periods ended September 30, 2017 and 2016, MasTec paid CCI approximately $22.9 million and $10.0 million, respectively, for equipment supplies, rentals, leases and servicing. For the nine month periods ended September 30, 2017 and 2016, MasTec paid CCI approximately $34.9 million and $13.7 million, respectively, net of rebates. As of September 30, 2017 and December 31, 2016, related payables totaled approximately $6.1 million and $1.5 million, respectively.

MasTec has a subcontracting arrangement with an entity for the performance of construction services, the minority owners of which include an entity controlled by Jorge Mas and José R. Mas, along with two members of management of a MasTec subsidiary. For the three month periods ended September 30, 2017 and 2016, MasTec incurred $39.2 million and $5.6 million, respectively, of expenses under this subcontracting arrangement, and for the nine month periods ended September 30, 2017 and 2016, MasTec incurred $54.8 million and $8.8 million, respectively. During the third quarter of 2016, the Company sold equipment totaling $0.3 million to this entity. As of September 30, 2017 and December 31, 2016, related amounts payable totaled $20.1 million and $0.1 million, respectively.

MasTec leases employees to a customer in which Jorge Mas and José R. Mas own a majority interest. For both three month periods ended September 30, 2017 and 2016, MasTec charged approximately $0.2 million to this customer, and for both the nine month periods ended September 30, 2017 and 2016, charged $0.6 million. As of both September 30, 2017 and December 31, 2016, outstanding receivables from employee leasing arrangements with this customer totaled $0.2 million. The Company also provides satellite communication services to this customer. For both the three month periods ended September 30, 2017 and 2016, revenue from satellite communication services provided to this customer totaled approximately $0.2 million, and for the nine month periods ended September 30, 2017 and 2016, satellite communication revenues totaled $0.6 million and $0.7 million, respectively. As of September 30, 2017 and December 31, 2016, receivables from this arrangement totaled approximately $0.3 million and $0.4 million, respectively.

MasTec has a leasing arrangement with an independent third party that leases an aircraft from a Company owned by Jorge Mas. For the three month periods ended September 30, 2017 and 2016, MasTec paid $0.5 million and $0.7 million, respectively, under this leasing arrangement, and for the nine month periods ended September 30, 2017 and 2016, MasTec paid $1.5 million and $2.0 million, respectively. As of both September 30, 2017 and December 31, 2016, related amounts payable were de minimis.

For the three month periods ended September 30, 2017 and 2016, related party lease payments for operational facilities and equipment, which are primarily associated with members of subsidiary management, totaled approximately $11.3 million and $12.5 million, respectively, and for the nine month periods ended September 30, 2017 and 2016, related party lease payments totaled approximately $38.4 million and $31.6 million, respectively. Payables associated with related party leases totaled approximately $0.6 million and $0.3 million as of September 30, 2017 and December 31, 2016, respectively. Additionally, payments for various types of supplies and services, including ancillary construction services, project-related site restoration and marketing and business development activities associated with members of subsidiary management totaled approximately $26.4 million and $7.4 million for the three month periods ended September 30, 2017 and 2016, respectively, and totaled $41.0 million and $14.2 million for the nine month periods ended September 30, 2017 and 2016, respectively. As of September 30, 2017 and December 31, 2016, associated amounts payable totaled approximately $0.8 million and $3.7 million, respectively. In addition, MasTec performs construction services for an entity associated with a member of subsidiary management. Revenue from this arrangement totaled $1.0 million for the three month period ended September 30, 2017, and related receivables totaled $0.5 million as of September 30, 2017. The oil and gas pipeline equipment company that was acquired by MasTec in the third quarter of 2017 was formerly owned by a member of subsidiary management. MasTec previously leased equipment from this company. The Company paid $40.6 million in cash and $57.3 million of contingent consideration in connection with this acquisition.

Non-controlling interests in entities consolidated by the Company represent ownership interests held by certain members of management of several of the Company’s subsidiaries, primarily in our Oil and Gas segment, and the Company has a subcontracting arrangement with one of these entities for the performance of ancillary oil and gas construction services, which transactions are eliminated in consolidation. The Company made distributions of earnings of $1.3 million in the first quarter of 2017 to holders of its non-controlling interests.

Split Dollar Agreements

MasTec has split dollar life insurance agreements with each of José R. Mas and Jorge Mas. In connection with the split dollar agreement for José R. Mas, the Company made no payments in either of the three month periods ended September 30, 2017 and 2016, and paid $0.7 million in each of the nine month periods ended September 30, 2017 and 2016. In connection with the split dollar agreement for Jorge Mas, the Company paid $0.6 million for both the three month periods ended September 30, 2017 and 2016, and paid $1.1 million for both the nine month periods ended September 30, 2017 and 2016. As of September 30, 2017 and December 31, 2016, life insurance assets associated with these agreements totaled $16.6 million and $14.8 million, respectively, which amount is included within other long-term assets.

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Supplemental Guarantor Financial Information

9 Months Ended

Sep. 30, 2017

Condensed Unaudited Financial Statements, Supplemental Guarantor Information [Abstract]

Supplemental Guarantor Financial Information

Note 16 – Supplemental Guarantor Condensed Unaudited Consolidating Financial Information

The 4.875% Senior Notes 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 (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 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 (loss) and cash flows for 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 (LOSS) (in millions)

For the Three Months Ended September 30, 2017	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	1,860.3		$	130.3		$	(34.8	)	$	1,955.8
Costs of revenue, excluding depreciation and amortization	—			1,640.3			120.7			(34.8		)	1,726.2
Depreciation and amortization	—			41.1			9.0			—			50.1
General and administrative expenses	0.5			61.7			4.2			—			66.4
Interest expense (income), net	—			33.2			(15.6		)	—			17.6
Equity in earnings of unconsolidated affiliates	—			—			(7.4		)	—			(7.4		)
Other income, net	—			(4.6		)	(0.1		)	—			(4.7		)
(Loss) income before income taxes	$	(0.5	)	$	88.6		$	19.5		$	—		$	107.6
Benefit from (provision for) income taxes	0.2			(33.8		)	(9.9		)	—			(43.4		)
Net (loss) income before equity in income from subsidiaries	$	(0.3	)	$	54.8		$	9.6		$	—		$	64.2
Equity in income from subsidiaries, net of tax	64.1			—			—			(64.1		)	—
Net income (loss)	$	63.8		$	54.8		$	9.6		$	(64.1	)	$	64.2
Net income attributable to non-controlling interests	—			—			0.4			—			0.4
Net income (loss) attributable to MasTec, Inc.	$	63.8		$	54.8		$	9.2		$	(64.1	)	$	63.8
Comprehensive income (loss)	$	65.2		$	54.9		$	11.1		$	(65.5	)	$	65.7

For the Three Months Ended September 30, 2016	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	1,493.9		$	112.7		$	(20.4	)	$	1,586.2
Costs of revenue, excluding depreciation and amortization	—			1,282.3			107.2			(20.4		)	1,369.0
Depreciation and amortization	—			33.7			8.9			—			42.6
General and administrative expenses	0.6			60.6			5.9			—			67.1
Interest expense (income), net	—			28.6			(15.5		)	—			13.1
Equity in losses of unconsolidated affiliates	—			—			—			—			—
Other (income) expense, net	—			(3.4		)	2.3			—			(1.0		)
(Loss) income before income taxes	$	(0.6	)	$	92.1		$	3.9		$	—		$	95.3
Benefit from (provision for) income taxes	0.2			(33.4		)	(5.6		)	—			(38.8		)
Net (loss) income before equity in income from subsidiaries	$	(0.4	)	$	58.7		$	(1.7	)	$	—		$	56.5
Equity in income from subsidiaries, net of tax	56.7			—			—			(56.7		)	—
Net income (loss)	$	56.3		$	58.7		$	(1.7	)	$	(56.7	)	$	56.5
Net income attributable to non-controlling interests	—			—			0.3			—			0.3
Net income (loss) attributable to MasTec, Inc.	$	56.3		$	58.7		$	(2.0	)	$	(56.7	)	$	56.3
Comprehensive income (loss)	$	54.5		$	58.7		$	(3.6	)	$	(54.9	)	$	54.7

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

For the Nine Months Ended September 30, 2017	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	4,763.4		$	347.4		$	(106.7	)	$	5,004.1
Costs of revenue, excluding depreciation and amortization	—			4,097.7			332.6			(106.7		)	4,323.6
Depreciation and amortization	—			112.2			26.2			—			138.4
General and administrative expenses	1.7			187.7			12.6			—			202.0
Interest expense (income), net	—			91.5			(46.5		)	—			45.0
Equity in earnings of unconsolidated affiliates	—			—			(15.1		)	—			(15.1		)
Other (income) expense, net	—			(9.9		)	5.8			—			(4.1		)
(Loss) income before income taxes	$	(1.7	)	$	284.2		$	31.8		$	—		$	314.3
Benefit from (provision for) income taxes	0.6			(104.9		)	(21.9		)	—			(126.2		)
Net (loss) income before equity in income from subsidiaries	$	(1.1	)	$	179.3		$	9.9		$	—		$	188.2
Equity in income from subsidiaries, net of tax	187.5			—			—			(187.5		)	—
Net income (loss)	$	186.4		$	179.3		$	9.9		$	(187.5	)	$	188.2
Net income attributable to non-controlling interests	—			—			1.8			—			1.8
Net income (loss) attributable to MasTec, Inc.	$	186.4		$	179.3		$	8.1		$	(187.5	)	$	186.4
Comprehensive income (loss)	$	187.5		$	179.3		$	11.1		$	(188.6	)	$	189.3

For the Nine Months Ended September 30, 2016	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	3,521.5		$	302.2		$	(30.9	)	$	3,792.8
Costs of revenue, excluding depreciation and amortization	—			3,054.5			298.0			(30.9		)	3,321.6
Depreciation and amortization	—			96.6			25.6			—			122.2
General and administrative expenses	1.7			172.1			21.2			—			195.0
Interest expense (income), net	—			83.8			(45.9		)	—			37.9
Equity in earnings of unconsolidated affiliates	—			—			(3.5		)	—			(3.5		)
Other income, net	—			(12.7		)	(0.1		)	—			(12.8		)
(Loss) income before income taxes	$	(1.7	)	$	127.2		$	6.9		$	—		$	132.4
Benefit from (provision for) income taxes	0.6			(47.3		)	(7.6		)	—			(54.3		)
Net (loss) income before equity in income from subsidiaries	$	(1.1	)	$	79.9		$	(0.7	)	$	—		$	78.1
Equity in income from subsidiaries, net of tax	78.8			—			—			(78.8		)	—
Net income (loss)	$	77.7		$	79.9		$	(0.7	)	$	(78.8	)	$	78.1
Net income attributable to non-controlling interests	—			—			0.4			—			0.4
Net income (loss) attributable to MasTec, Inc.	$	77.7		$	79.9		$	(1.1	)	$	(78.8	)	$	77.7
Comprehensive income (loss)	$	69.2		$	79.9		$	(9.2	)	$	(70.3	)	$	69.6

CONDENSED UNAUDITED CONSOLIDATING BALANCE SHEETS (in millions)

As of September 30 2017	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Total current assets	$	—	$	1,576.0	$	259.8	$	(88.1	)	$	1,747.7
Property and equipment, net	—		600.8		90.6		—			691.4
Goodwill and other intangible assets, net	—		1,187.9		143.0		—			1,330.9
Investments in and advances to consolidated affiliates, net	1,279.7		848.0		710.2		(2,837.9		)	—
Other long-term assets	15.8		25.7		130.6		—			172.1
Total assets	$	1,295.5	$	4,238.4	$	1,334.2	$	(2,926.0	)	$	3,942.2
Liabilities and equity
Total current liabilities	$	—	$	982.5	$	107.7	$	(88.1	)	$	1,002.2
Long-term debt	—		1,181.1		11.2		—			1,192.3
Other long-term liabilities	—		432.0		12.7		—			444.7
Total liabilities	$	—	$	2,595.6	$	131.6	$	(88.1	)	$	2,639.1
Total equity	$	1,295.5	$	1,642.8	$	1,202.6	$	(2,837.9	)	$	1,303.0
Total liabilities and equity	$	1,295.5	$	4,238.4	$	1,334.2	$	(2,926.0	)	$	3,942.2

As of December 31, 2016	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Total current assets	$	—	$	1,256.3	$	175.8	$	(29.6	)	$	1,402.5
Property and equipment, net	—		456.6		92.5		—			549.1
Goodwill and other intangible assets, net	—		1,037.4		138.2		—			1,175.6
Investments in and advances to consolidated affiliates, net	1,083.9		625.9		861.2		(2,571.0		)	—
Other long-term assets	12.6		25.3		18.0		—			55.9
Total assets	$	1,096.5	$	3,401.5	$	1,285.7	$	(2,600.6	)	$	3,183.1
Liabilities and equity
Total current liabilities	$	—	$	759.7	$	109.9	$	(29.6	)	$	840.0
Long-term debt	—		938.7		22.7		—			961.4
Other long-term liabilities	—		256.2		21.9		—			278.1
Total liabilities	$	—	$	1,954.6	$	154.5	$	(29.6	)	$	2,079.5
Total equity	$	1,096.5	$	1,446.9	$	1,131.2	$	(2,571.0	)	$	1,103.6
Total liabilities and equity	$	1,096.5	$	3,401.5	$	1,285.7	$	(2,600.6	)	$	3,183.1

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF CASH FLOWS (in millions)

For the Nine Months Ended September 30, 2017	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash provided by (used in) operating activities	$	—		$	222.0		$	(43.4	)	$	—	$	178.6
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	—			(116.0		)	—			—		(116.0		)
Capital expenditures	—			(70.0		)	(13.3		)	—		(83.3		)
Proceeds from sale of property and equipment	—			12.5			1.1			—		13.6
Payments for other investments	—			(3.8		)	(73.3		)	—		(77.1		)
Proceeds from other investments	—			1.2			12.2			—		13.4
Net cash used in investing activities	$	—		$	(176.1	)	$	(73.3	)	$	—	$	(249.4	)
Cash flows from financing activities:
Proceeds from credit facilities	—			1,988.1			14.3			—		2,002.4
Repayments of credit facilities	—			(1,817.4		)	(23.0		)	—		(1,840.4		)
Repayments of other borrowings and capital lease obligations	—			(52.6		)	(8.3		)	—		(60.8		)
Payments of acquisition-related contingent consideration	—			(18.8		)	—			—		(18.8		)
Distributions to non-controlling interests	—			—			(1.3		)	—		(1.3		)
Proceeds from stock-based awards, net	0.9			—			—			—		0.9
Other financing activities, net	—			(6.3		)	—			—		(6.3		)
Net financing activities and advances (to) from consolidated affiliates	(0.9		)	(131.9		)	132.8			—		—
Net cash (used in) provided by financing activities	$	—		$	(38.9	)	$	114.5		$	—	$	75.6
Effect of currency translation on cash	—			—			0.2			—		0.2
Net increase (decrease) in cash and cash equivalents	$	—		$	7.0		$	(2.0	)	$	—	$	5.1
Cash and cash equivalents - beginning of period	$	—		$	28.3		$	10.5		$	—	$	38.8
Cash and cash equivalents - end of period	$	—		$	35.3		$	8.5		$	—	$	43.8

For the Nine Months Ended September 30, 2016	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash provided by operating activities	$	—		$	87.2		$	39.9		$	—	$	127.1
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	—			(4.1		)	—			—		(4.1		)
Capital expenditures	—			(84.0		)	(5.1		)	—		(89.1		)
Proceeds from sale of property and equipment	—			3.1			3.7			—		6.8
Payments for other investments	—			(3.8		)	(5.0		)	—		(8.9		)
Proceeds from other investments	—			—			1.1			—		1.1
Net cash used in investing activities	$	—		$	(88.8	)	$	(5.3	)	$	—	$	(94.1	)
Cash flows from financing activities:
Proceeds from credit facilities	—			1,093.8			93.0			—		1,186.8
Repayments of credit facilities	—			(1,056.1		)	(93.8		)	—		(1,149.9		)
Repayments of other borrowings and capital lease obligations	—			(37.6		)	(12.4		)	—		(50.0		)
Payments of acquisition-related contingent consideration	—			(16.5		)	(3.3		)	—		(19.8		)
Proceeds from stock-based awards, net	3.4			—			0.5			—		3.9
Other financing activities, net	1.4			—			—			—		1.4
Net financing activities and advances (to) from consolidated affiliates	(4.8		)	15.1			(10.3		)	—		—
Net cash used in financing activities	$	—		$	(1.3	)	$	(26.3	)	$	—	$	(27.6	)
Effect of currency translation on cash	—			—			(1.0		)	—		(1.0		)
Net (decrease) increase in cash and cash equivalents	$	—		$	(2.9	)	$	7.3		$	—	$	4.4
Cash and cash equivalents - beginning of period	$	—		$	4.7		$	0.3		$	—	$	5.0
Cash and cash equivalents - end of period	$	—		$	1.8		$	7.6		$	—	$	9.4

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

9 Months Ended

Sep. 30, 2017

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, 2016 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, 2016 contained in the Company’s 2016 Annual Report on Form 10-K (the “2016 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. All significant intercompany balances and transactions have been eliminated in consolidation. Other parties’ interests in entities that MasTec consolidates 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 for 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, or, for investments in a net liability position, within other long-term liabilities. Income or loss from these investments is recorded as a separate line item in the statements of operations. Intercompany profits or losses associated with the Company’s equity method investments are eliminated until realized by the investee in transactions with third parties. For equity investees in which the Company has an undivided interest in the assets, liabilities and profits or losses of an unincorporated entity, but the Company does not exercise control over the entity, the Company consolidates its proportional interest in the accounts of the entity. The cost method is used for investments in entities for which the Company does not have the ability to exert significant influence.

Management determines whether each business entity in which it has equity interests, debt, or other investments constitutes a variable interest entity (“VIE”) based on the nature and characteristics of such arrangements. If an investment arrangement is determined to be a VIE, then management determines if the Company is the VIE’s primary beneficiary by evaluating several factors, including the Company’s: (i) risks and responsibilities; (ii) ownership interests; (iii) decision making powers; and (iv) financial interests, among other factors. If management determines the Company is the primary beneficiary of a VIE, then it would be consolidated, and other parties’ interests in the VIE would be accounted for as non-controlling interests. 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.

Equity Method Investments

The Company’s investments in entities for 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, or, for investments in a net liability position, within other long-term liabilities. Income or loss from these investments is recorded as a separate line item in the statements of operations. Intercompany profits or losses associated with the Company’s equity method investments are eliminated until realized by the investee in transactions with third parties.

Unincorporated Entities, Proportionate Consolidation

For equity investees in which the Company has an undivided interest in the assets, liabilities and profits or losses of an unincorporated entity, but the Company does not exercise control over the entity, the Company consolidates its proportional interest in the accounts of the entity.

Cost Method Investments

The cost method is used for investments in entities for which the Company does not have the ability to exert significant influence.

Variable Interest Entities

Management determines whether each business entity in which it has equity interests, debt, or other investments constitutes a variable interest entity (“VIE”) based on the nature and characteristics of such arrangements. If an investment arrangement is determined to be a VIE, then management determines if the Company is the VIE’s primary beneficiary by evaluating several factors, including the Company’s: (i) risks and responsibilities; (ii) ownership interests; (iii) decision making powers; and (iv) financial interests, among other factors. If management determines the Company is the primary beneficiary of a VIE, then it would be consolidated, and other parties’ interests in the VIE would be accounted for as non-controlling interests. 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.

Translation of Foreign Currencies

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 their local currency as their functional currency. Currency gains or losses resulting from transactions executed in currencies other than the functional currency are included in other income or expense, net.

Management Estimates

Management Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires the use of estimates and assumptions that affect the amounts reported in the consolidated 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 project-related depreciation), in particular, on construction contracts accounted for under the percentage-of-completion method, for which the recorded amounts require estimates of costs to complete and the amount of probable contract price adjustments; allowances for doubtful accounts; estimated fair values of goodwill and intangible assets; acquisition-related contingent consideration and investments in equity investees; asset lives used in computing depreciation and amortization; fair values of financial instruments; accrued self-insured claims; share-based compensation; other accruals and allowances; accounting for income taxes; and the estimated impact of litigation and other contingencies. While management believes that such estimates are reasonable when considered in conjunction with the Company’s consolidated financial position and results of operations taken as a whole, actual results could differ materially from those estimates.

Revenue Recognition

Revenue Recognition

Revenue is derived from construction projects performed under master and other service agreements as well as from 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 services under unit price or fixed price master service or other service agreements. 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 32% and 38% of consolidated revenue for the three month periods ended September 30, 2017 and 2016, respectively, and totaled 35% and 43% for the nine month periods ended September 30, 2017 and 2016, respectively. 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. 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 project managers, engineers and financial professionals. Management reviews estimates of contract revenue and costs on an ongoing basis. Changes in job performance, job conditions and management’s assessment of expected contract settlements are factors that influence estimates of total contract value and total 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. For both the nine month periods ended September 30, 2017 and 2016, project profit was affected by less than 5% as a result of changes in contract estimates included in projects that were in process as of December 31, 2016 and 2015. 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 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 such costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, and defers costs 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, 2017 and December 31, 2016, the Company had approximately $77 million and $17 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 earned and that management believes is probable of collection. As of both September 30, 2017 and December 31, 2016, these change orders were primarily related to contracts in the Oil and Gas segment. The Company actively engages in substantive meetings with its customers to complete the final approval process, and generally 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 Earnings (“BIEC”) on uncompleted contracts is classified within current liabilities. Costs and Earnings In Excess of Billings (“CIEB”), which is also referred to as work in process, is classified within current assets. 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. 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 project managers, engineers and financial professionals. Management reviews estimates of contract revenue and costs on an ongoing basis. Changes in job performance, job conditions and management’s assessment of expected contract settlements are factors that influence estimates of total contract value and total 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. For both the nine month periods ended September 30, 2017 and 2016, project profit was affected by less than 5% as a result of changes in contract estimates included in projects that were in process as of December 31, 2016 and 2015. 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 completed within one year.

Recently Issued Accounting Pronouncements

Recently Issued Accounting Pronouncements

There have been no changes in the expected dates of adoption or estimated effects on the Company’s consolidated financial statements of recently issued accounting pronouncements from those disclosed in the Company’s 2016 Form 10-K. See below for additional discussion of recently issued accounting pronouncements.

Accounting Pronouncements Not Yet Adopted

In August 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”)2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”). ASU 2017-12 amends the hedge accounting model in Topic 815 to enable entities to better portray the economics of their risk management activities in the financial statements and enhance the transparency and understandability of hedge results. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. The guidance also simplifies certain documentation and assessment requirements. ASU 2017-12 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. All transition requirements and elections should be applied to hedging relationships existing on the date of adoption and their effects should be reflected as of the beginning of the fiscal year of adoption. The presentation and disclosure requirements are effective on a prospective basis. The Company is currently evaluating the potential effect of this ASU on its consolidated financial statements.

In May 2017, FASB issued ASU 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting (“ASU 2017-09”). ASU 2017-09 clarifies when a change to the terms or conditions of a share-based payment award must be accounted for as a modification. Limited and administrative modifications that do not change the value, vesting conditions, or classification of the award are exempt from following the modification guidance in Topic 718. ASU 2017-09 is effective on a prospective basis for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted. The Company does not expect the adoption of this ASU to have a material effect on its consolidated financial statements.

In February 2017, the FASB issued ASU 2017-05, Other Income- Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets(“ASU 2017-05”). ASU 2017-05 clarifies certain guidance under Subtopic 610-20 that was issued as part of the new revenue standard, including the recognition of gains and losses on the sale or transfer of nonfinancial assets to noncustomers, and clarifies accounting for contributions of nonfinancial assets to joint ventures, among other requirements. ASU 2017-05 is effective on a retrospective basis for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted. The Company is currently evaluating the potential effect of this ASU 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 judgment and make estimates when evaluating contract terms and other relevant facts and circumstances. Additionally, ASU 2014-09 requires enhanced disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. 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 full retrospective or modified retrospective transition approach for fiscal years, and for interim periods within those years, beginning after December 15, 2017. In 2016, the FASB issued several accounting standards updates to clarify certain topics within ASU 2014-09. The Company will adopt ASU 2014-09, and its related clarifying ASUs, as of January 1, 2018.

The Company has substantially completed its assessment of the potential effects of these ASUs on its consolidated financial statements, business processes, systems and controls.  The Company’s assessment included a detailed review of representative contracts at each of the Company’s business units and a comparison of its historical accounting policies and practices to the new standard. Based on the Company’s review of various types of revenue arrangements, the Company expects to recognize revenue and earnings over time utilizing the cost-to-cost measure of progress for its fixed price contracts and certain master service and other service agreements, consistent with current practice.  For these contracts, the cost-to-cost measure of progress best depicts the transfer of control of goods or services to the customer under the new standard. The Company has substantially completed its analysis of the information necessary to enable the preparation of the financial statements and related disclosures under the new standard. As part of this analysis, the Company evaluated its information technology capabilities and systems, and does not expect to incur significant information technology costs to modify systems currently in place. The Company will implement targeted changes to its internal reporting processes to facilitate gathering the data needed for reporting and disclosure under the new standard. The Company will also implement updates to its control processes and procedures, as necessary, based on changes resulting from the new standard. The Company does not expect any such updates to materially affect the Company’s internal controls over financial reporting.

The Company anticipates adopting the standard using the modified retrospective transition approach.  Under this approach, the new standard would apply to all new contracts initiated on or after January 1, 2018.  For existing contracts that have remaining obligations as of January 1, 2018, any difference between the recognition criteria in these ASUs and the Company’s current revenue recognition practices would be recognized using a cumulative effect adjustment to the opening balance of retained earnings.  Any potential effect of adoption of these ASUs has not yet been quantified; however, based on the review of contracts across all of the Company’s business units to date, the adoption of these ASUs is not expected to have a material effect on the timing or amount of revenue recognized as compared to current practices.  The Company is training its business units for the implementation of the new standard, and continues developing the disclosures required by the new standard. The Company is also reviewing certain contracts entered into by its business units subsequent to its initial assessment that are expected to have performance obligations remaining as of January 1, 2018 for any cumulative effect adjustments that may be required upon adoption.

Accounting Pronouncements Adopted as of January 1, 2017

The Company adopted ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”) effective January 1, 2017. Under ASU 2016-09, excess tax benefits (“windfalls”) or tax deficiencies (“shortfalls”) are recognized in the income statement, rather than as additional paid-in-capital as under the previous guidance, and are presented as operating cash flows, rather than as a financing activity. This ASU also increased the amount of tax that can be withheld by an employer for employee tax withholdings without resulting in liability classification of an award. Payments to taxing authorities for such employee withholdings are presented as financing activities. ASU 2016-09 also allows companies to account for forfeitures of share-based payments as they occur or to estimate such amounts. The provisions of ASU 2016-09 that were applicable to the Company were adopted on a prospective basis; the retrospective requirement to classify payments to taxing authorities for employee withholdings as a financing activity was consistent with the Company’s existing methodology, therefore did not result in a change. The adoption of ASU 2016-09 is expected to result in volatility in income tax expense given that windfalls or shortfalls are recognized in income tax expense in the periods in which they occur. The other components of this ASU did not have a material effect on the consolidated financial statements.

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Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

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
	2017		2016		2017		2016
Net income attributable to MasTec:
Net income - basic and diluted (a)	$	63,752	$	56,277	$	186,390	$	77,672
Weighted average shares outstanding:
Weighted average shares outstanding - basic	80,953		80,462		80,859		80,323
Dilutive common stock equivalents	1,433		1,083		1,422		918
Weighted average shares outstanding - diluted	82,386		81,545		82,281		81,241
Additional information:
Weighted average anti-dilutive common stock equivalents (b)	—		1		12		—

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

(b) Represents anti-dilutive common stock equivalents as calculated under the treasury stock method.

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Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill by Segment

The following table provides details of goodwill by reportable segment as of September 30, 2017 (in millions):

	Communications		Oil and Gas			Electrical Transmission		Power Generation and Industrial		Total Goodwill
Goodwill, gross	$	462.4	$	461.6		$	149.9	$	137.0	$	1,210.9
Accumulated impairment losses	—		(75.4		)	—		—		(75.4		)
Goodwill, net	$	462.4	$	386.2		$	149.9	$	137.0	$	1,135.5

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, as of December 31, 2016	$	34.5	$	74.6	$	195.1		$	19.1		$	323.3
Accumulated amortization					(131.9		)	(11.7		)	(143.6		)
Other intangible assets, net, as of December 31, 2016	$	34.5	$	74.6	$	63.2		$	7.4		$	179.7
Additions from new business combinations	—		—		24.4			2.4			26.8
Amortization expense					(13.9		)	(1.1		)	(15.0		)
Currency translation adjustments	—		3.4		0.5			0.1			4.0
Other intangible assets, net, as of September 30, 2017	$	34.5	$	78.0	$	74.2		$	8.8		$	195.5

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

Schedule of Consideration Paid and Net Assets Acquired, Business Combinations

The following table summarizes the estimated fair values of consideration paid and identifiable assets acquired and liabilities assumed as of the respective dates of acquisition (in millions).

Acquisition consideration:	2017
Cash	$	118.8
Fair value of contingent consideration (earn-out liability)	89.6
Total consideration transferred	$	208.4
Identifiable assets acquired and liabilities assumed:
Current assets, primarily composed of accounts receivable and $2.8 million of cash acquired	$	42.7
Property and equipment	56.9
Amortizing intangible assets	26.8
Other long-term assets	0.5
Current liabilities, including current portion of capital lease obligations and long-term debt	(28.4		)
Long-term debt, including capital lease obligations	(9.9		)
Deferred income taxes	(15.5		)
Total identifiable net assets	$	73.1
Goodwill	$	135.3
Total net assets acquired, including goodwill	$	208.4

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Accounts Receivable, Net of Allowance (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017			December 31, 2016
Contract billings	$	626.7		$	564.2
Retainage	287.6			268.6
Costs and earnings in excess of billings	629.5			331.6
Accounts receivable, gross	$	1,543.8		$	1,164.4
Less allowance for doubtful accounts	(9.0		)	(8.4		)
Accounts receivable, net	$	1,534.8		$	1,156.0

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Property and Equipment, Net (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017			December 31, 2016
Land	$	4.6		$	4.6
Buildings and leasehold improvements	25.7			24.2
Machinery and equipment	1,237.3			997.8
Office furniture and equipment	149.6			146.1
Construction in progress	8.9			9.5
Total property and equipment	$	1,426.1		$	1,182.2
Less accumulated depreciation and amortization	(734.7		)	(633.1		)
Property and equipment, net	$	691.4		$	549.1

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Debt (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017			December 31, 2016
Senior secured credit facility:	February 22, 2022
Revolving loans		$	300.6		$	279.9
Term loan		400.0			237.5
4.875% Senior Notes	March 15, 2023	400.0			400.0
Capital lease obligations, weighted average interest rate of 3.5%	In installments through September 1, 2022	179.9			98.6
Notes payable and other debt obligations	Varies	12.1			19.8
Total long-term debt obligations		$	1,292.6		$	1,035.8
Less unamortized deferred financing costs		(13.8		)	(9.8		)
Total debt, net of deferred financing costs		$	1,278.8		$	1,026.0
Current portion of long-term debt		86.5			64.6
Long-term debt		$	1,192.3		$	961.4

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

9 Months Ended

Sep. 30, 2017

Share-based Compensation [Abstract]

Schedule of Activity, Restricted Shares

Activity, restricted shares: (a)	Restricted Shares		Per Share Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2016	1,970,586		$	21.61
Granted	193,348		39.47
Vested	(304,211	)	40.72
Canceled/forfeited	(30,041	)	20.24
Non-vested restricted shares, as of September 30, 2017	1,829,682		$	20.34

(a) Includes 39,050 and 43,300 restricted stock units as of September 30, 2017 and December 31, 2016, respectively.

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
	2017		2016
Cash proceeds (in millions)	$	2.4	$	2.0
Common shares issued	68,789		115,556
Weighted average price per share	$	34.72	$	16.88
Weighted average per share grant date fair value	$	9.00	$	4.58

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

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

	For the Three Months Ended September 30				For the Nine Months Ended September 30
	2017		2016		2017		2016
Non-cash stock-based compensation expense	$	3.4	$	3.9	$	10.5	$	11.3
Income Tax Effects:
Income tax effect of non-cash stock-based compensation	$	1.3	$	1.7	$	3.8	$	5.6
Excess tax benefit from non-cash stock-based compensation (a)	$	0.0	$	0.3	$	0.1	$	1.4

(a) Excess tax benefits represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with share-based payment arrangements. For the ninemonth period ended September 30, 2017, the Company incurred a net tax deficiency of $0.1 million related to the vesting of share-based payment awards and excess tax benefits were de minimis. As discussed in Note 1 - Business, Basis of Presentation and Significant Accounting Policies, the Company adopted ASU 2016-09 effective January 1, 2017 on a prospective basis. ASU 2016-09 changed the required presentation of excess tax benefits in the consolidated statement of cash flows from financing activities to operating activities. Excess tax benefits for the comparative prior year period are classified as cash flows from financing activities.

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Other Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2017

Multiemployer Plans [Abstract]

Schedule of Covered Employees and Contributions, Multiemployer Plans

Total contributions to multiemployer 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:

	Multiemployer Plans
	Covered Employees		Contributions (in millions)
	Low	High	Pension		Other Multiemployer		Total
For the Three Months Ended September 30:
2017	3,669	7,057	$	36.7	$	2.7	$	39.4
2016	4,170	4,910	$	26.4	$	2.9	$	29.3
For the Nine Months Ended September 30:
2017	550	7,057	$	68.1	$	8.0	$	76.1
2016	1,112	4,910	$	43.4	$	7.6	$	51.0

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Segments and Related Information (Tables)

9 Months Ended

Sep. 30, 2017

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
Revenue:	2017			2016			2017			2016
Communications (a)	$	610.5		$	624.3		$	1,762.2		$	1,728.0
Oil and Gas	1,161.0			736.0			2,757.2			1,454.3
Electrical Transmission	81.8			101.7			277.3			283.6
Power Generation and Industrial	96.9			123.6			204.1			324.7
Other	10.6			7.6			14.2			14.9
Eliminations	(5.0		)	(7.0		)	(10.9		)	(12.7		)
Consolidated revenue	$	1,955.8		$	1,586.2		$	5,004.1		$	3,792.8

(a) Revenue generated primarily by utilities customers represented 13.0% and 11.1% of Communications segment revenue for the three month periods ended September 30, 2017 and 2016, respectively, and represented 12.6% and 10.9% for the nine month periods ended September 30, 2017 and 2016, respectively.

	For the Three Months Ended September 30						For the Nine Months Ended September 30
EBITDA:	2017			2016			2017			2016
Communications	$	65.3		$	62.8		$	173.2		$	190.9
Oil and Gas	108.1			117.8			356.1			187.6
Electrical Transmission	4.5			(8.3		)	11.2			(42.0		)
Power Generation and Industrial	9.3			6.1			14.8			13.8
Other	10.1			(3.1		)	11.6			(2.6		)
Corporate	(22.0		)	(24.3		)	(69.2		)	(55.1		)
Consolidated EBITDA	$	175.3		$	151.0		$	497.7		$	292.6

	For the Three Months Ended September 30				For the Nine Months Ended September 30
Depreciation and Amortization:	2017		2016		2017		2016
Communications	$	13.8	$	12.5	$	39.4	$	37.2
Oil and Gas	26.0		20.7		71.1		58.2
Electrical Transmission	5.8		6.1		17.3		17.1
Power Generation and Industrial	2.9		1.6		5.8		4.6
Other	0.0		0.0		0.1		0.0
Corporate	1.6		1.7		4.7		5.1
Consolidated depreciation and amortization	$	50.1	$	42.6	$	138.4	$	122.2

Reconciliation of Consolidated Income before Income Taxes to EBITDA

The following table, which may contain slight summation differences due to rounding, presents a reconciliation of consolidated income before income taxes to EBITDA (in millions):

	For the Three Months Ended September 30				For the Nine Months Ended September 30
EBITDA Reconciliation:	2017		2016		2017		2016
Income before income taxes	$	107.6	$	95.3	$	314.3	$	132.4
Plus:
Interest expense, net	17.6		13.1		45.0		37.9
Depreciation and amortization	50.1		42.6		138.4		122.2
Consolidated EBITDA	$	175.3	$	151.0	$	497.7	$	292.6

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
Customer:	2017	2016	2017	2016
Energy Transfer affiliates (a)	49%	35%	40%	26%
AT&T (including DIRECTV®) (b)	21%	30%	25%	34%

(a) The Company's relationship with Energy Transfer affiliates is based upon various construction contracts for pipeline activities with Energy Transfer Partners L.P., and their subsidiaries and affiliates, all of which are consolidated by Energy Transfer Equity, L.P. Revenue from Energy Transfer affiliates is included in the Oil and Gas segment.

(b) The Company’s relationship with AT&T is based upon multiple separate master service and other service agreements, including for installation and maintenance services, as well as construction/installation contracts for AT&T’s: (i) wireless business; (ii) wireline/fiber businesses; and (iii) various install-to-the-home businesses, including DIRECTV®. Revenue from AT&T is included in the Communications segment.

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Supplemental Guarantor Financial Information (Tables)

9 Months Ended

Sep. 30, 2017

Condensed Unaudited Financial Statements, Supplemental Guarantor Information [Abstract]

Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss)

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

For the Three Months Ended September 30, 2017	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	1,860.3		$	130.3		$	(34.8	)	$	1,955.8
Costs of revenue, excluding depreciation and amortization	—			1,640.3			120.7			(34.8		)	1,726.2
Depreciation and amortization	—			41.1			9.0			—			50.1
General and administrative expenses	0.5			61.7			4.2			—			66.4
Interest expense (income), net	—			33.2			(15.6		)	—			17.6
Equity in earnings of unconsolidated affiliates	—			—			(7.4		)	—			(7.4		)
Other income, net	—			(4.6		)	(0.1		)	—			(4.7		)
(Loss) income before income taxes	$	(0.5	)	$	88.6		$	19.5		$	—		$	107.6
Benefit from (provision for) income taxes	0.2			(33.8		)	(9.9		)	—			(43.4		)
Net (loss) income before equity in income from subsidiaries	$	(0.3	)	$	54.8		$	9.6		$	—		$	64.2
Equity in income from subsidiaries, net of tax	64.1			—			—			(64.1		)	—
Net income (loss)	$	63.8		$	54.8		$	9.6		$	(64.1	)	$	64.2
Net income attributable to non-controlling interests	—			—			0.4			—			0.4
Net income (loss) attributable to MasTec, Inc.	$	63.8		$	54.8		$	9.2		$	(64.1	)	$	63.8
Comprehensive income (loss)	$	65.2		$	54.9		$	11.1		$	(65.5	)	$	65.7

For the Three Months Ended September 30, 2016	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	1,493.9		$	112.7		$	(20.4	)	$	1,586.2
Costs of revenue, excluding depreciation and amortization	—			1,282.3			107.2			(20.4		)	1,369.0
Depreciation and amortization	—			33.7			8.9			—			42.6
General and administrative expenses	0.6			60.6			5.9			—			67.1
Interest expense (income), net	—			28.6			(15.5		)	—			13.1
Equity in losses of unconsolidated affiliates	—			—			—			—			—
Other (income) expense, net	—			(3.4		)	2.3			—			(1.0		)
(Loss) income before income taxes	$	(0.6	)	$	92.1		$	3.9		$	—		$	95.3
Benefit from (provision for) income taxes	0.2			(33.4		)	(5.6		)	—			(38.8		)
Net (loss) income before equity in income from subsidiaries	$	(0.4	)	$	58.7		$	(1.7	)	$	—		$	56.5
Equity in income from subsidiaries, net of tax	56.7			—			—			(56.7		)	—
Net income (loss)	$	56.3		$	58.7		$	(1.7	)	$	(56.7	)	$	56.5
Net income attributable to non-controlling interests	—			—			0.3			—			0.3
Net income (loss) attributable to MasTec, Inc.	$	56.3		$	58.7		$	(2.0	)	$	(56.7	)	$	56.3
Comprehensive income (loss)	$	54.5		$	58.7		$	(3.6	)	$	(54.9	)	$	54.7

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

For the Nine Months Ended September 30, 2017	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	4,763.4		$	347.4		$	(106.7	)	$	5,004.1
Costs of revenue, excluding depreciation and amortization	—			4,097.7			332.6			(106.7		)	4,323.6
Depreciation and amortization	—			112.2			26.2			—			138.4
General and administrative expenses	1.7			187.7			12.6			—			202.0
Interest expense (income), net	—			91.5			(46.5		)	—			45.0
Equity in earnings of unconsolidated affiliates	—			—			(15.1		)	—			(15.1		)
Other (income) expense, net	—			(9.9		)	5.8			—			(4.1		)
(Loss) income before income taxes	$	(1.7	)	$	284.2		$	31.8		$	—		$	314.3
Benefit from (provision for) income taxes	0.6			(104.9		)	(21.9		)	—			(126.2		)
Net (loss) income before equity in income from subsidiaries	$	(1.1	)	$	179.3		$	9.9		$	—		$	188.2
Equity in income from subsidiaries, net of tax	187.5			—			—			(187.5		)	—
Net income (loss)	$	186.4		$	179.3		$	9.9		$	(187.5	)	$	188.2
Net income attributable to non-controlling interests	—			—			1.8			—			1.8
Net income (loss) attributable to MasTec, Inc.	$	186.4		$	179.3		$	8.1		$	(187.5	)	$	186.4
Comprehensive income (loss)	$	187.5		$	179.3		$	11.1		$	(188.6	)	$	189.3

For the Nine Months Ended September 30, 2016	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated MasTec, Inc.
Revenue	$	—		$	3,521.5		$	302.2		$	(30.9	)	$	3,792.8
Costs of revenue, excluding depreciation and amortization	—			3,054.5			298.0			(30.9		)	3,321.6
Depreciation and amortization	—			96.6			25.6			—			122.2
General and administrative expenses	1.7			172.1			21.2			—			195.0
Interest expense (income), net	—			83.8			(45.9		)	—			37.9
Equity in earnings of unconsolidated affiliates	—			—			(3.5		)	—			(3.5		)
Other income, net	—			(12.7		)	(0.1		)	—			(12.8		)
(Loss) income before income taxes	$	(1.7	)	$	127.2		$	6.9		$	—		$	132.4
Benefit from (provision for) income taxes	0.6			(47.3		)	(7.6		)	—			(54.3		)
Net (loss) income before equity in income from subsidiaries	$	(1.1	)	$	79.9		$	(0.7	)	$	—		$	78.1
Equity in income from subsidiaries, net of tax	78.8			—			—			(78.8		)	—
Net income (loss)	$	77.7		$	79.9		$	(0.7	)	$	(78.8	)	$	78.1
Net income attributable to non-controlling interests	—			—			0.4			—			0.4
Net income (loss) attributable to MasTec, Inc.	$	77.7		$	79.9		$	(1.1	)	$	(78.8	)	$	77.7
Comprehensive income (loss)	$	69.2		$	79.9		$	(9.2	)	$	(70.3	)	$	69.6

Condensed Unaudited Consolidating Balance Sheets

CONDENSED UNAUDITED CONSOLIDATING BALANCE SHEETS (in millions)

As of September 30 2017	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Total current assets	$	—	$	1,576.0	$	259.8	$	(88.1	)	$	1,747.7
Property and equipment, net	—		600.8		90.6		—			691.4
Goodwill and other intangible assets, net	—		1,187.9		143.0		—			1,330.9
Investments in and advances to consolidated affiliates, net	1,279.7		848.0		710.2		(2,837.9		)	—
Other long-term assets	15.8		25.7		130.6		—			172.1
Total assets	$	1,295.5	$	4,238.4	$	1,334.2	$	(2,926.0	)	$	3,942.2
Liabilities and equity
Total current liabilities	$	—	$	982.5	$	107.7	$	(88.1	)	$	1,002.2
Long-term debt	—		1,181.1		11.2		—			1,192.3
Other long-term liabilities	—		432.0		12.7		—			444.7
Total liabilities	$	—	$	2,595.6	$	131.6	$	(88.1	)	$	2,639.1
Total equity	$	1,295.5	$	1,642.8	$	1,202.6	$	(2,837.9	)	$	1,303.0
Total liabilities and equity	$	1,295.5	$	4,238.4	$	1,334.2	$	(2,926.0	)	$	3,942.2

As of December 31, 2016	MasTec, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated MasTec, Inc.
Assets
Total current assets	$	—	$	1,256.3	$	175.8	$	(29.6	)	$	1,402.5
Property and equipment, net	—		456.6		92.5		—			549.1
Goodwill and other intangible assets, net	—		1,037.4		138.2		—			1,175.6
Investments in and advances to consolidated affiliates, net	1,083.9		625.9		861.2		(2,571.0		)	—
Other long-term assets	12.6		25.3		18.0		—			55.9
Total assets	$	1,096.5	$	3,401.5	$	1,285.7	$	(2,600.6	)	$	3,183.1
Liabilities and equity
Total current liabilities	$	—	$	759.7	$	109.9	$	(29.6	)	$	840.0
Long-term debt	—		938.7		22.7		—			961.4
Other long-term liabilities	—		256.2		21.9		—			278.1
Total liabilities	$	—	$	1,954.6	$	154.5	$	(29.6	)	$	2,079.5
Total equity	$	1,096.5	$	1,446.9	$	1,131.2	$	(2,571.0	)	$	1,103.6
Total liabilities and equity	$	1,096.5	$	3,401.5	$	1,285.7	$	(2,600.6	)	$	3,183.1

Condensed Unaudited Consolidating Statements of Cash Flows

CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF CASH FLOWS (in millions)

For the Nine Months Ended September 30, 2017	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash provided by (used in) operating activities	$	—		$	222.0		$	(43.4	)	$	—	$	178.6
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	—			(116.0		)	—			—		(116.0		)
Capital expenditures	—			(70.0		)	(13.3		)	—		(83.3		)
Proceeds from sale of property and equipment	—			12.5			1.1			—		13.6
Payments for other investments	—			(3.8		)	(73.3		)	—		(77.1		)
Proceeds from other investments	—			1.2			12.2			—		13.4
Net cash used in investing activities	$	—		$	(176.1	)	$	(73.3	)	$	—	$	(249.4	)
Cash flows from financing activities:
Proceeds from credit facilities	—			1,988.1			14.3			—		2,002.4
Repayments of credit facilities	—			(1,817.4		)	(23.0		)	—		(1,840.4		)
Repayments of other borrowings and capital lease obligations	—			(52.6		)	(8.3		)	—		(60.8		)
Payments of acquisition-related contingent consideration	—			(18.8		)	—			—		(18.8		)
Distributions to non-controlling interests	—			—			(1.3		)	—		(1.3		)
Proceeds from stock-based awards, net	0.9			—			—			—		0.9
Other financing activities, net	—			(6.3		)	—			—		(6.3		)
Net financing activities and advances (to) from consolidated affiliates	(0.9		)	(131.9		)	132.8			—		—
Net cash (used in) provided by financing activities	$	—		$	(38.9	)	$	114.5		$	—	$	75.6
Effect of currency translation on cash	—			—			0.2			—		0.2
Net increase (decrease) in cash and cash equivalents	$	—		$	7.0		$	(2.0	)	$	—	$	5.1
Cash and cash equivalents - beginning of period	$	—		$	28.3		$	10.5		$	—	$	38.8
Cash and cash equivalents - end of period	$	—		$	35.3		$	8.5		$	—	$	43.8

For the Nine Months Ended September 30, 2016	MasTec, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated MasTec, Inc.
Net cash provided by operating activities	$	—		$	87.2		$	39.9		$	—	$	127.1
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	—			(4.1		)	—			—		(4.1		)
Capital expenditures	—			(84.0		)	(5.1		)	—		(89.1		)
Proceeds from sale of property and equipment	—			3.1			3.7			—		6.8
Payments for other investments	—			(3.8		)	(5.0		)	—		(8.9		)
Proceeds from other investments	—			—			1.1			—		1.1
Net cash used in investing activities	$	—		$	(88.8	)	$	(5.3	)	$	—	$	(94.1	)
Cash flows from financing activities:
Proceeds from credit facilities	—			1,093.8			93.0			—		1,186.8
Repayments of credit facilities	—			(1,056.1		)	(93.8		)	—		(1,149.9		)
Repayments of other borrowings and capital lease obligations	—			(37.6		)	(12.4		)	—		(50.0		)
Payments of acquisition-related contingent consideration	—			(16.5		)	(3.3		)	—		(19.8		)
Proceeds from stock-based awards, net	3.4			—			0.5			—		3.9
Other financing activities, net	1.4			—			—			—		1.4
Net financing activities and advances (to) from consolidated affiliates	(4.8		)	15.1			(10.3		)	—		—
Net cash used in financing activities	$	—		$	(1.3	)	$	(26.3	)	$	—	$	(27.6	)
Effect of currency translation on cash	—			—			(1.0		)	—		(1.0		)
Net (decrease) increase in cash and cash equivalents	$	—		$	(2.9	)	$	7.3		$	—	$	4.4
Cash and cash equivalents - beginning of period	$	—		$	4.7		$	0.3		$	—	$	5.0
Cash and cash equivalents - end of period	$	—		$	1.8		$	7.6		$	—	$	9.4

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Business, Basis of Presentation and Significant Accounting Policies (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016	Dec. 31, 2016 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 such costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, and defers costs 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, 2017 and December 31, 2016, the Company had approximately $77 million and $17 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 earned and that management believes is probable of collection. As of both September 30, 2017 and December 31, 2016, these change orders were primarily related to contracts in the Oil and Gas segment. The Company actively engages in substantive meetings with its customers to complete the final approval process, and generally 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.
Accounts Receivable [Member]
Revenue Recognition [Line Items]
Unapproved change orders, expected to be billed and collected within one year, amount (in dollars) | $	$ 77		$ 77		$ 17
Maximum [Member]
Revenue Recognition [Line Items]
Fixed price contract, percentage-of-completion method, 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%
Master Service and Other Service Agreements [Member] | Concentration Risk from Type of Arrangement [Member] | Revenue [Member]
Revenue Recognition [Line Items]
Concentration risk, percentage of total	32.00%	38.00%	35.00%	43.00%

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Earnings Per Share (Narrative) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Earnings Per Share [Line Items]
Computation of earnings per share, methodology			Basic earnings or loss per share is computed by dividing net income or loss attributable to MasTec by the weighted average number of common shares outstanding for the period, which excludes non-participating unvested restricted share awards. Diluted earnings per share is computed by dividing net income attributable to MasTec by the weighted average number of fully diluted shares, as calculated under the treasury stock method, which includes the potential effect of dilutive common stock equivalents, such as issued but unvested restricted shares and/or outstanding but unexercised stock options. The Company has no remaining outstanding stock options; all options under the Company’s stock option grants were exercised in 2016. If the Company reports a loss, rather than income, the computation of diluted loss per share excludes the effect of dilutive common stock equivalents, as their effect would be anti-dilutive.
Dilutive common stock equivalents (in shares)	1,433,000	1,083,000	1,422,000	918,000
ASU 2016-09 [Member]
Earnings Per Share [Line Items]
Dilutive common stock equivalents (in shares)	300,000		300,000
Common Stock [Member]
Earnings Per Share [Line Items]
Remaining stock options (in shares)	0		0		0

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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income attributable to MasTec:
Net income - basic (in dollars)	[1]	$ 63,752	$ 56,277	$ 186,390	$ 77,672
Net income - diluted (in dollars)	[1]	$ 63,752	$ 56,277	$ 186,390	$ 77,672
Weighted average shares outstanding:
Weighted average shares outstanding - basic		80,953	80,462	80,859	80,323
Dilutive common stock equivalents (in shares)		1,433	1,083	1,422	918
Weighted average shares outstanding - diluted		82,386	81,545	82,281	81,241
Common Stock [Member]
Weighted average shares outstanding:
Weighted average anti-dilutive common stock equivalents (in shares)	[2]	0	1	12	0

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

[2] Represents anti-dilutive common stock equivalents as calculated under the treasury stock method.

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Goodwill and Other Intangible Assets (Schedule of Goodwill by Segment) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill, gross	$ 1,210,900
Accumulated impairment losses	(75,400)
Goodwill, net	1,135,450	$ 995,874
Communications [Member]
Goodwill [Line Items]
Goodwill, gross	462,400
Accumulated impairment losses	0
Goodwill, net	462,400
Oil and Gas [Member]
Goodwill [Line Items]
Goodwill, gross	461,600
Accumulated impairment losses	(75,400)
Goodwill, net	386,200
Electrical Transmission [Member]
Goodwill [Line Items]
Goodwill, gross	149,900
Accumulated impairment losses	0
Goodwill, net	149,900
Power Generation and Industrial [Member]
Goodwill [Line Items]
Goodwill, gross	137,000
Accumulated impairment losses	0
Goodwill, net	$ 137,000

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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Goodwill [Line Items]
Goodwill, additions from new business combinations			$ 135.3
Amortization expense, intangible assets	$ 6.0	$ 5.2	15.0	$ 15.7
Earn-Out Arrangements [Member]
Goodwill [Line Items]
Accruals of acquisition-related contingent consideration				5.8
Goodwill, Gross [Member]
Goodwill [Line Items]
Goodwill, currency translation gains (losses)			9.8	6.0
Goodwill, Accumulated Impairment Losses [Member]
Goodwill [Line Items]
Goodwill, currency translation gains (losses)			$ (5.4)	$ (3.1)

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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Other Intangible Assets [Line Items]
Other intangible assets, gross						$ 323,300
Accumulated amortization						(143,600)
Other Intangible Assets [Rollforward]
Other intangible assets, net, beginning balance				$ 179,711
Additions from new business combinations, other intangible assets				26,800
Amortization expense		$ (6,000)	$ (5,200)	(15,000)	$ (15,700)
Currency translation adjustments, other intangible assets				4,000
Other intangible assets, net, ending balance		195,454		195,454
Customer Relationships and Backlog [Member]
Other Intangible Assets [Line Items]
Other intangible assets, amortizing, gross						195,100
Accumulated amortization						(131,900)
Other Intangible Assets [Rollforward]
Other intangible assets, net, amortizing, beginning balance				63,200
Additions from new business combinations, amortizing intangible assets				24,400
Amortization expense				(13,900)
Currency translation adjustments, amortizing intangible assets				500
Other intangible assets, net, amortizing, ending balance		74,200		74,200
Other Amortizing Intangible Assets [Member]
Other Intangible Assets [Line Items]
Other intangible assets, amortizing, gross	[1]					19,100
Accumulated amortization	[1]					(11,700)
Other Intangible Assets [Rollforward]
Other intangible assets, net, amortizing, beginning balance	[1]			7,400
Additions from new business combinations, amortizing intangible assets				2,400
Amortization expense	[1]			(1,100)
Currency translation adjustments, amortizing intangible assets	[1]			100
Other intangible assets, net, amortizing, ending balance	[1]	8,800		8,800
Trade Names [Member]
Other Intangible Assets [Line Items]
Other intangible assets, non-amortizing, carrying amount		34,500		34,500		34,500
Other Intangible Assets [Rollforward]
Other intangible assets, non-amortizing, beginning balance				34,500
Additions from new business combinations, non-amortizing intangible assets				0
Currency translation adjustments, non-amortizing intangible assets				0
Other intangible assets, non-amortizing, ending balance		34,500		34,500
Pre-Qualifications [Member]
Other Intangible Assets [Line Items]
Other intangible assets, non-amortizing, carrying amount		78,000		74,600		$ 74,600
Other Intangible Assets [Rollforward]
Other intangible assets, non-amortizing, beginning balance				74,600
Additions from new business combinations, non-amortizing intangible assets				0
Currency translation adjustments, non-amortizing intangible assets				3,400
Other intangible assets, non-amortizing, ending balance		$ 78,000		$ 78,000

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

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Goodwill and Other Intangible Assets (2017 Acquisitions) (Narrative) (Details) $ in Millions		3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Business Combination [Line Items]
Business combinations, number of acquisitions				3
Unaudited Pro Forma Financial Information and Aquisition-Related Results
Business acquisition, pro forma revenue		$ 1,955.8	$ 1,634.5	$ 5,077.4	$ 3,934.6
Business acquisition, pro forma net income		64.4	$ 59.0	$ 192.0	$ 81.5
Business acquisition, pro forma information, description				The unaudited supplemental pro forma financial results have been prepared by adjusting the historical results of MasTec to include the historical results of the acquired businesses described above, and then adjusted (i) to remove acquisition costs; (ii) to increase amortization expense resulting from the acquired intangible assets; (iii) to increase interest expense as a result of the cash consideration paid; (iv) to reduce interest expense from debt repaid upon acquisition; and (iv) to eliminate the effect of intercompany transactions. Additionally, the unaudited supplemental pro forma financial results do not include adjustments to reflect other cost savings or synergies that may have resulted from these acquisitions.
Business acquisition, acquisition-related results, revenue		62.2		$ 96.1
Business acquisition, acquisition-related results, net income		3.2		$ 4.7
2017 Communications Acquisition [Member]
Business Combination [Line Items]
Business combinations, description of acquired entity				a wireline/fiber deployment construction contractor
2017 Power Generation and Industrial Acquisition [Member]
Business Combination [Line Items]
Business combinations, description of acquired entity				a heavy civil construction services company
2017 Oil and Gas Acquisition [Member]
Business Combination [Line Items]
Business combinations, description of acquired entity				an oil and gas pipeline equipment company
2017 Acquisitions [Member]
Business Combination [Line Items]
Business combinations, acquired finite-lived intangible assets, weighted average useful life (in years)	10 years
Business combinations, goodwill recognized, description				The goodwill balances for the respective acquisitions represent the estimated value of each acquired company’s geographic presence in key markets, their assembled workforce, and management team industry-specific project management expertise, as well as synergies expected to be achieved from the combined operations of the acquired companies and MasTec.
Business combinations, goodwill, expected tax deductible amount (in dollars)	$ 75.0	$ 75.0		$ 75.0
2017 Acquisitions [Member] | Earn-Out Arrangements [Member]
Business Combination [Line Items]
Business combinations, contingent consideration, basis for amount				The contingent consideration included in the table above equals the acquired companies’ earnings before interest, taxes, depreciation and amortization (“EBITDA”) above certain thresholds, if applicable, for a period of five years, as set forth in the respective purchase agreements, which amounts are payable annually.
Contingent consideration, earn-out period (in years)				5 years
Business combinations, contingent consideration, fair value measurements, valuation technique				The fair values of the earn-out liabilities were estimated using income approaches such as discounted cash flows or option pricing models and incorporate significant inputs not observable in the market.
Business combinations, contingent consideration, fair value measurements, significant assumptions				Key assumptions in the estimated valuations include the discount rate and probability-weighted EBITDA projections.
2017 Acquisitions [Member] | Customer Relationships [Member]
Business Combination [Line Items]
Business combinations, acquired finite-lived intangible assets, weighted average useful life (in years)	11 years
2017 Acquisitions [Member] | Backlog [Member]
Business Combination [Line Items]
Business combinations, acquired finite-lived intangible assets, weighted average useful life (in years)	4 years
2017 Acquisitions [Member] | Other Amortizing Intangible Assets [Member]
Business Combination [Line Items]
Business combinations, acquired finite-lived intangible assets, weighted average useful life (in years)	7 years

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Goodwill and Other Intangible Assets (Schedule of Consideration Paid and Net Assets Acquired, Business Combinations) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Identifiable assets acquired and liabilities assumed:
Goodwill	$ 1,135,450		$ 995,874
Earn-Out Arrangements [Member]
Acquisition consideration:
Fair value of contingent consideration (earn-out liability)	89,614	$ 0
2017 Acquisitions [Member]
Acquisition consideration:
Cash	118,800
Total consideration transferred	208,400
Identifiable assets acquired and liabilities assumed:
Current assets, primarily composed of accounts receivable and $2.8 million of cash acquired	42,700
Cash acquired	2,800
Property and equipment	56,900
Amortizing intangible assets	26,800
Other long-term assets	500
Current liabilities, including current portion of capital lease obligations and long-term debt	(28,400)
Long-term debt, including capital lease obligations	(9,900)
Deferred income taxes	(15,500)
Total identifiable net assets	73,100
Goodwill	135,300
Total net assets acquired, including goodwill	208,400
2017 Acquisitions [Member] | Earn-Out Arrangements [Member]
Acquisition consideration:
Fair value of contingent consideration (earn-out liability)	$ 89,600

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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
	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
ASC 805 contingent consideration, range of potential earn-out liabilities, maximum unlimited				there is no maximum payment amount
ASC 805 contingent consideration, additions from new business combinations	$ 64,600,000			$ 89,600,000
ASC 805 contingent consideration, payments	0	$ 5,300,000		18,800,000	$ 15,800,000
Other Income (Expense) [Member]
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
ASC 805 contingent consideration liability, gain (loss) included in earnings	3,000,000		$ 2,300,000	$ 11,600,000
Level 3 [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
Fair value measurements, valuation techniques				The fair value of the Company’s ASC 805 contingent consideration is estimated using income approaches such as discounted cash flows or option pricing models and incorporates significant inputs not observable in the market.
Level 3 [Member] | Fair Value [Member]
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
ASC 805 contingent consideration, fair value	104,900,000			$ 104,900,000		$ 45,800,000
Level 3 [Member] | Fair Value [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
ASC 805 contingent consideration, range of potential undiscounted earn-out liabilities, low	15,000,000			15,000,000
ASC 805 contingent consideration, range of potential undiscounted earn-out liabilities, high	170,000,000			170,000,000
Level 3 [Member] | Fair Value [Member] | Other Current Liabilities [Member]
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
ASC 805 contingent consideration, fair value	$ 18,900,000			$ 18,900,000		$ 21,800,000

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Fair Value of Financial Instruments (Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis) (Narrative) (Details) - 4.875% Senior Notes [Member] - Senior Notes [Member] - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Debt instrument, interest rate (percentage)	4.875%
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
Fair Value Measurements, Non-Recurring [Member] | Gross 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
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)	$ 407.0	$ 388.0

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Fair Value of Financial Instruments (Cost and Equity Investees) (Narrative) (Details)		3 Months Ended					9 Months Ended
	Sep. 30, 2017 USD ($) $ / shares	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2014
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, cumulative undistributed earnings	$ 10,600,000	$ 10,600,000					$ 10,600,000
Equity in earnings (losses) of unconsolidated affiliates		7,399,000			$ (6,000)		15,105,000	$ 3,549,000
Unrealized gains (losses) on equity investee activity, net of tax		808,000			(345,000)		(1,287,000)	(12,932,000)
Credit Facility [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Letters of credit issued	$ 189,100,000	$ 189,100,000					$ 189,100,000		$ 314,300,000
Equity Investees [Member] | Pacer [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Construction projects, percentage complete	100.00%	100.00%					100.00%
Investee [Member] | Pacer [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Number of joint ventures										2
Investee [Member] | Pacer [Member] | Canadian Dollars [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity in earnings (losses) of unconsolidated affiliates						$ 3,600,000
Revenue, related parties						$ 600,000
Net investment, equity investments	$ 14,800,000	$ 14,800,000					$ 14,800,000		31,400,000
Other equity investment, proceeds related to ongoing liquidation				$ 12,100,000
Income (expense) from investment, change in expected recovery amounts			$ (5,800,000)
Investee [Member] | Pacer [Member] | Canadian Dollars [Member] | Equity Investments, Remaining Amounts Committed [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Contractual joint venture, additional amounts committed	0	0					0
CCI [Member] | Immediate Family Member of Management or Principal Owner [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Cost method investment, original cost	$ 15,000,000	$ 15,000,000					$ 15,000,000
Waha JVs [Member] | Equity Investees [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Number of pipelines in operation	2	2					2
Equity investment, equity and other contributions		$ 0					$ 73,300,000
Revenue, related parties		3,600,000			80,900,000		255,200,000	142,800,000
Receivables, including retainage, net of BIEC, related parties	$ 52,200,000	52,200,000					52,200,000		71,200,000
Net investment, equity investments	115,000,000	115,000,000					115,000,000		6,000,000
Waha JVs [Member] | Equity Investees [Member] | Interest Rate Swap [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Unrealized gains (losses) on equity investee activity		1,300,000			(600,000)		(2,100,000)	(21,100,000)
Unrealized gains (losses) on equity investee activity, net of tax		800,000			$ (300,000)		(1,300,000)	$ (12,900,000)
Waha JVs [Member] | Equity Investees [Member] | Other [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity in earnings (losses) of unconsolidated affiliates		7,400,000					15,100,000
Waha JVs [Member] | Equity Investees [Member] | Credit Facility [Member] | Financial Standby [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Letters of credit issued	$ 19,000,000	19,000,000					$ 19,000,000		$ 91,000,000
Joint Venture Liquidated in 2016 [Member] | Investee [Member] | Pacer [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Number of joint ventures									1
Pensare [Member] | Chief Executive Officer [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Payment to acquire cost method investment and warrants		$ 2,000,000
Cost method investment, ownership percentage	4.00%	4.00%					4.00%
Warrants, exercise price (in dollars per share) | $ / shares	$ 11.50
Pensare [Member] | Chief Executive Officer [Member] | Warrant [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Warrants, number held	2,000,000	2,000,000					2,000,000
Common Stock [Member] | Pensare [Member] | Chief Executive Officer [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Investment, restriction period (in years)	1 year

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Accounts Receivable, Net of Allowance (Schedule of Accounts Receivable, Net of Allowance) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accounts Receivable, Net of Allowance
Contract billings	$ 626,700	$ 564,200
Retainage	287,600	268,600
Costs and earnings in excess of billings	629,500	331,600
Accounts receivable, gross	1,543,800	1,164,400
Less allowance for doubtful accounts	(9,000)	(8,400)
Accounts receivable, net	$ 1,534,790	$ 1,156,031

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Accounts Receivable, Net of Allowance (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule of Accounts Receivable, Net of Allowance [Line Items]
Provisions for doubtful accounts	$ 0.4	$ 0.4	$ 1.1	$ 2.0
Interest Expense [Member] | Financing Receivable [Member]
Schedule of Accounts Receivable, Net of Allowance [Line Items]
Non-recourse financing arrangement, discount charge	$ 2.1	$ 0.8	$ 4.7	$ 1.7

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Property and Equipment, Net (Schedule of Property and Equipment, Net) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property and Equipment [Line Items]
Property and equipment	$ 1,426,100	$ 1,182,200
Less accumulated depreciation and amortization	(734,700)	(633,100)
Property and equipment, net	691,430	549,084
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	25,700	24,200
Machinery and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	1,237,300	997,800
Office Furniture and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	149,600	146,100
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment	$ 8,900	$ 9,500

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Property and Equipment, Net (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Property and Equipment [Line Items]
Capitalized internal-use software, gross	$ 108,700		$ 108,700		$ 107,800
Capitalized internal-use software, net	24,800		24,800		$ 30,900
Depreciation and amortization	50,101	$ 42,584	138,384	$ 122,249
Property and Equipment [Member]
Property and Equipment [Line Items]
Depreciation and amortization	$ 44,100	$ 37,400	$ 123,400	$ 106,500

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Debt (Schedule of Carrying Values of Debt) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Capital lease obligations	$ 179,900	$ 98,600
Total long-term debt obligations	1,292,600	1,035,800
Less unamortized deferred financing costs	(13,800)	(9,800)
Total debt, net of deferred financing costs	1,278,800	1,026,000
Current portion of long-term debt	86,547	64,600
Long-term debt	$ 1,192,311	961,379
Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maturity date	Feb. 22, 2022
Credit Facility [Member] | Revolving Loans [Member]
Debt Instrument [Line Items]
Long-term debt obligations	$ 300,600	279,900
Credit Facility [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt obligations	$ 400,000	237,500
Senior Notes [Member] | 4.875% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Mar. 15, 2023
Long-term debt obligations	$ 400,000	400,000
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital lease obligations, expiration date, range, end	Sep. 01, 2022
Notes Payable and Other Debt Obligations [Member]
Debt Instrument [Line Items]
Long-term debt obligations	$ 12,100	$ 19,800

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Debt (Schedule of Carrying Values of Debt) (Interest Rates) (Details)	Sep. 30, 2017
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)	3.50%

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Debt (Senior Secured Credit Facility) (Narrative) (Details) - Credit Facility [Member]			9 Months Ended
	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2017 USD ($)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,500,000,000	$ 1,200,000,000	$ 1,500,000,000
Line of credit facility, maturity date			Feb. 22, 2022
Line of credit facility, description of variable rate			Outstanding revolving loans and the term loan under the Credit Facility bear interest, at the Company’s option, at a rate equal to either (a) a Eurocurrency Rate, as defined in the 2017 Credit Facility, plus a margin of 1.25% to 2.00% (under the 2016 Credit Facility, the margin was from 1.00% to 2.00%), or (b) a Base Rate, as defined in the 2017 Credit Facility, plus a margin of 0.25% to 1.00% (under the 2016 Credit Facility, the margin was from 0.00% to 1.00%). The Base Rate equals the highest of (i) the Federal Funds Rate, as defined in the Credit Facility, plus 0.50%, (ii) Bank of America’s prime rate, and (iii) the Eurocurrency Rate plus 1.00%.
Line of credit facility, commitment fee description			The Company must also pay a commitment fee to the lenders of 0.20% to 0.40% on any unused availability under the Credit Facility.
Line of credit facility, letters of credit issued	$ 189,100,000	$ 314,300,000	$ 189,100,000
Line of credit facility, unused facility fee (percentage)	0.30%	0.40%
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, covenant terms			The Credit Facility requires that the Company maintain a Maximum Consolidated Leverage Ratio, as defined in the Credit Facility, of 3.50 (subject to the Acquisition Adjustment described below). The Credit Facility also requires that the Company maintain a Minimum Consolidated Interest Coverage Ratio, as defined in the Credit Facility, of 3.00. The Credit Facility provides that, for purposes of calculating the Consolidated Leverage Ratio, certain cash charges may be added back to the calculation of Consolidated EBITDA, as defined in the Credit Facility, and funded indebtedness excludes undrawn standby performance letters of credit. Additionally, notwithstanding the terms discussed above, subject to certain conditions, if a permitted acquisition or series of permitted acquisitions having consideration exceeding $50 million occurs during a fiscal quarter, the Consolidated Leverage Ratio may be temporarily increased to up to 3.75 during such fiscal quarter and the subsequent two fiscal quarters. Such right may be exercised no more than two times during the term of the Credit Facility. Subject to customary exceptions, the Credit Facility limits the borrowers’ and the Guarantor Subsidiaries’ ability to engage in certain activities, including acquisitions, mergers and consolidations, debt incurrence, investments, capital expenditures, asset sales, debt prepayments, lien incurrence and the making of distributions or repurchases of capital stock. However, distributions payable solely in capital stock are permitted. The Credit Facility provides for customary events of default and carries cross-default provisions with the Company’s other significant debt instruments, including the Company’s indemnity agreement with its surety provider, as well as customary remedies, including the acceleration of repayment of outstanding amounts and other remedies with respect to the collateral securing the Credit Facility obligations.
Maximum [Member]
Debt Instrument [Line Items]
Line of credit facility, revolving loan sublimit, Canadian dollars or Mexican pesos	$ 300,000,000		$ 300,000,000
Line of credit facility, unused facility fee (percentage)	0.40%	0.40%
Line of credit facility, required consolidated leverage ratio (in multiple)	3.50		3.50
Maximum [Member] | Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Line of credit facility, variable interest rate, margin over base rate (percentage)	2.00%	2.00%
Maximum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Line of credit facility, variable interest rate, margin over base rate (percentage)	1.00%	1.00%
Minimum [Member]
Debt Instrument [Line Items]
Line of credit facility, unused facility fee (percentage)	0.20%	0.20%
Line of credit facility, required consolidated interest coverage ratio (in multiple)	3.0		3.0
Minimum [Member] | Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Line of credit facility, variable interest rate, margin over base rate (percentage)	1.25%	1.00%
Minimum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Line of credit facility, variable interest rate, margin over base rate (percentage)	0.25%	0.00%
Plan [Member]
Debt Instrument [Line Items]
Line of credit facility, adjusted consolidated leverage ratio, permitted acquisitions amount, minimum threshold			$ 50,000,000
Plan [Member] | Maximum [Member] | Permitted Acquisition [Member]
Debt Instrument [Line Items]
Line of credit facility, required consolidated leverage ratio (in multiple)	3.75		3.75
Line of credit facility, adjusted consolidated leverage ratio, permitted acquisitions, maximum number of times right may be exercised	2		2
Base Rate Option (i) [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Line of credit facility, variable interest rate, margin over base rate (percentage)			0.50%
Base Rate Option (ii) [Member] | Bank of America Prime Rate [Member]
Debt Instrument [Line Items]
Line of credit facility, variable interest rate, margin over base rate (percentage)			0.00%
Base Rate Option (iii) [Member] | Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Line of credit facility, variable interest rate, margin over base rate (percentage)			1.00%
Revolving Loans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,100,000,000		$ 1,100,000,000
Long-term debt obligations	300,600,000	$ 279,900,000	300,600,000
Line of credit facility, amount of borrowings denominated in foreign currencies	171,000,000	119,000,000	171,000,000
Line of credit facility, remaining borrowing capacity	610,300,000	405,900,000	610,300,000
Line of credit facility, remaining borrowing capacity available in either Canadian dollars or Mexican pesos	$ 129,400,000	$ 80,900,000	$ 129,400,000
Revolving Loans [Member] | Weighted Average [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	2.96%	3.71%	2.96%
Term Loan [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 400,000,000		$ 400,000,000
Long-term debt obligations	$ 400,000,000	$ 237,500,000	$ 400,000,000
Line of credit facility, interest rate (percentage)	2.86%	2.77%	2.86%
Term Loan [Member] | Plan [Member]
Debt Instrument [Line Items]
Line of credit facility, term loan, frequency of payments			quarterly
Line of credit facility, term loan, amount of quarterly principal installment payments			$ 3,100,000
Letters of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate description, letters of credit			Financial standby letters of credit and commercial letters of credit issued under the 2017 Credit Facility are subject to a letter of credit fee of 1.25% to 2.00% (under the 2016 Credit Facility, the letter of credit fee was from 1.00% to 2.00%), and performance standby letters of credit are subject to a letter of credit fee of 0.50% to 1.00% under the Credit Facility.
Line of credit facility, capacity available for letters of credit	$ 460,900,000	$ 335,700,000	$ 460,900,000
Letters of Credit [Member] | Financial Standby [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	1.625%	2.00%	1.625%
Letters of Credit [Member] | Performance Standby [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	0.75%	1.00%	0.75%
Letters of Credit [Member] | Maximum [Member]
Debt Instrument [Line Items]
Line of credit facility, capacity available for letters of credit sublimit, Canadian dollars or Mexican pesos	$ 200,000,000		$ 200,000,000
Line of credit facility, capacity available for letters of credit	$ 650,000,000		$ 650,000,000
Letters of Credit [Member] | Maximum [Member] | Financial Standby [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	2.00%	2.00%	2.00%
Letters of Credit [Member] | Maximum [Member] | Performance Standby [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	1.00%	1.00%	1.00%
Letters of Credit [Member] | Minimum [Member] | Financial Standby [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	1.25%	1.00%	1.25%
Letters of Credit [Member] | Minimum [Member] | Performance Standby [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	0.50%	0.50%	0.50%
Swing Line Loans [Member] | Maximum [Member]
Debt Instrument [Line Items]
Line of credit facility, swing line loans sublimit	$ 75,000,000		$ 75,000,000
Accordion Feature [Member] | Plan [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 250,000,000		$ 250,000,000

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Debt (Other Credit Facilities) (Narrative) (Details) - Other Credit Facilities [Member] CAD in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2017 CAD	Sep. 30, 2017 USD ($)	Dec. 31, 2016 CAD	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity (in dollars) | CAD	CAD 20.0		CAD 40.0
Debt instrument, rationale for classification as long-term debt	Outstanding borrowings that are not renewed are repaid with borrowings under the Company’s senior secured credit facility. Accordingly, the carrying amounts of the Company’s borrowings under its other credit facilities, which are included within notes payable and other debt obligations in the table above, 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)	4.00%	4.00%	3.60%	3.60%
Canadian Dollars [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity (in dollars)		$ 16.0		$ 29.8
Long-term debt obligations (in dollars)		$ 5.4		$ 13.4

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Debt (Debt Guarantees and Covenants) (Narrative) (Details) - Senior Notes [Member] - 4.875% Senior Notes [Member]	9 Months Ended
	Sep. 30, 2017
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 Company’s Credit Facility or other outstanding indebtedness.
Debt instrument, interest rate (percentage)	4.875%

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Debt (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Credit Facility [Member]
Debt Instrument [Line Items]
Payments of financing costs	$ 6.0
Senior Notes [Member] | 4.875% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)	4.875%
Other Accrued Expenses [Member]
Debt Instrument [Line Items]
Debt instruments, accrued interest payable	$ 4.1	$ 8.5

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Lease Obligations (Capital Leases) (Narrative) (Details) - Property and Equipment [Member] - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Capital Leases [Line Items]
Assets held under capital lease, gross	$ 404.1	$ 294.9
Assets held under capital lease, net	$ 269.6	$ 177.5

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Lease Obligations (Operating Leases) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Lease Term in Excess of One Year [Member]
Operating Leased Assets [Line Items]
Operating leases, rent and related expense (in dollars)	$ 25.4	$ 25.9	$ 77.6	$ 74.8
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 and related expense (in dollars)	$ 159.4	$ 96.7	$ 347.8	$ 213.9
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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Stock-Based Compensation and Other Employee Benefit Plans (Narrative) (Details) shares in Millions	Sep. 30, 2017 shares
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	4.9

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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, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation awards, unearned compensation	$ 15.8	$ 15.8		$ 15.8
Stock-based compensation awards, unearned compensation, weighted average expected recognition period (in years)	1 year 1 month 6 days
Stock-based compensation, vested awards, intrinsic value		$ 0.1	$ 0.1	$ 11.9	$ 1.5

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Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Activity, Restricted Shares) (Details) - Common Stock [Member]	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Restricted Shares [Member]
Restricted Shares
Non-vested restricted shares, beginning balance (in shares)	1,970,586	[1]
Granted (in shares)	193,348
Vested (in shares)	(304,211)
Canceled/forfeited (in shares)	(30,041)
Non-vested restricted shares, ending balance (in shares)	1,829,682	[1]
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) | $ / shares	$ 21.61
Granted (in dollars per share) | $ / shares	39.47
Vested (in dollars per share) | $ / shares	40.72
Canceled/forfeited (in dollars per share) | $ / shares	20.24
Non-vested restricted shares, per share weighted average grant date fair value, ending balance (in dollars per share) | $ / shares	$ 20.34
Restricted Stock Units [Member]
Restricted Shares
Non-vested restricted shares, beginning balance (in shares)	43,300	[1]
Non-vested restricted shares, ending balance (in shares)	39,050	[1]

[1] Includes 39,050 and 43,300 restricted stock units as of September 30, 2017 and December 31, 2016, respectively.

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Stock-Based Compensation and Other Employee Benefit Plans (Stock Options) (Narrative) (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercised, intrinsic value	$ 500,000	$ 1,800,000
Stock options exercised, proceeds	$ 0	$ 1,900,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation awards, stock options, outstanding (in shares)			0	0

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Stock-Based Compensation and Other Employee Benefit Plans (Employee Stock Purchase Plans) (Narrative) (Details)	9 Months Ended
	Sep. 30, 2017
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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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, 2017	Sep. 30, 2016
Common Stock [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Common shares issued (in shares)	68,789	115,556
Employee Stock Purchase Plans [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Cash proceeds (in dollars)	$ 2.4	$ 2.0
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)	$ 34.72	$ 16.88
Weighted average per share grant date fair value (in dollars per share)	$ 9.00	$ 4.58

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Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Non-Cash Stock-Based Compensation Expense and Related Tax Effects) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Non-cash stock-based compensation expense				$ 10,551	$ 11,291
Income Tax Effects:
Income tax effect of non-cash stock-based compensation		$ 1,300	$ 1,700	3,800	5,600
Excess tax benefit from non-cash stock-based compensation	[1]	0	300	100	1,400
Net income tax effect		43,378	38,816	126,170	54,331
ASU 2016-09 [Member]
Income Tax Effects:
Net income tax effect				100
General and Administrative Expenses [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Non-cash stock-based compensation expense		$ 3,400	$ 3,900	$ 10,500	$ 11,300

[1] Excess tax benefits represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with share-based payment arrangements. For the nine month period ended September 30, 2017, the Company incurred a net tax deficiency of $0.1 million related to the vesting of share-based payment awards and excess tax benefits were de minimis. As discussed in Note 1 - Business, Basis of Presentation and Significant Accounting Policies, the Company adopted ASU 2016-09 effective January 1, 2017 on a prospective basis. ASU 2016-09 changed the required presentation of excess tax benefits in the consolidated statement of cash flows from financing activities to operating activities. Excess tax benefits for the comparative prior year period are classified as cash flows from financing activities.

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Other Retirement Plans (Narrative) (Details)	9 Months Ended
	Sep. 30, 2017
Multiemployer Plans [Abstract]
Multiemployer plans, general nature	Certain of MasTec’s subsidiaries, including certain subsidiaries in Canada, contribute amounts to multiemployer pension and other multiemployer 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. Multiemployer plan contribution rates are determined annually and assessed on a “pay-as-you-go” basis based on union employee payrolls.

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Other Retirement Plans (Schedule of Covered Employees and Contributions, Multiemployer Plans) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) employee	Sep. 30, 2016 USD ($) employee	Sep. 30, 2017 USD ($) employee	Sep. 30, 2016 USD ($) employee
Covered Employees and Contributions, Multiemployer Plans [Line Items]
Multiemployer plans, contributions (in dollars)	$ 39.4	$ 29.3	$ 76.1	$ 51.0
Multiemployer Plans, Pension [Member]
Covered Employees and Contributions, Multiemployer Plans [Line Items]
Multiemployer plans, contributions (in dollars)	36.7	26.4	68.1	43.4
Multiemployer Plans, Other Multiemployer [Member]
Covered Employees and Contributions, Multiemployer Plans [Line Items]
Multiemployer plans, contributions (in dollars)	$ 2.7	$ 2.9	$ 8.0	$ 7.6
Workforce Subject to Collective Bargaining Arrangements [Member] | Unionized Employees [Member] | Low [Member]
Covered Employees and Contributions, Multiemployer Plans [Line Items]
Multiemployer plans, covered employees (in number of employees) | employee	3,669	4,170	550	1,112
Workforce Subject to Collective Bargaining Arrangements [Member] | Unionized Employees [Member] | High [Member]
Covered Employees and Contributions, Multiemployer Plans [Line Items]
Multiemployer plans, covered employees (in number of employees) | employee	7,057	4,910	7,057	4,910

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Equity (Share Activity) (Narrative) (Details)	19 Months Ended
	Sep. 30, 2017 shares
2016 Share Repurchase Program [Member] | Treasury Stock, Common [Member]
Equity, Treasury Stock [Line Items]
Common stock repurchases (in shares)	0

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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
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.
Long-term deferred tax liabilities	$ 274,465
Current deferred tax assets, net		$ 11,800
Long-term deferred tax liabilities, net		178,355
Accrued income and other taxes payable, current	$ 19,800	$ 40,300

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Segments and Related Information (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)
Segments and Related Information [Line Items]
Segment reporting information, factors used to identify entity's reportable segments			MasTec manages its 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 includes equity investees, the services of which vary from those provided by the Company’s four primary segments, as well as other small business units that perform construction and other services for a variety of international end-markets.
Communications [Member]
Segments and Related Information [Line Items]
Segment reporting information, description of products and services			The Communications segment performs engineering, construction, maintenance and customer fulfillment activities related to communications infrastructure primarily for wireless and wireline/fiber communications and install-to-the-home customers, and, to a lesser extent, infrastructure for utilities, among others.
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.
Oil and Gas [Member] | Contracts Accounted for under Percentage-of-Completion [Member]
Segments and Related Information [Line Items]
Project losses (in dollars) | $				$ 13.5
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] | Contracts Accounted for under Percentage-of-Completion [Member]
Segments and Related Information [Line Items]
Project losses (in dollars) | $				15.1
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/biofuel facilities and various types of heavy civil and industrial infrastructure.
Primary Segments [Member]
Segments and Related Information [Line Items]
Number of operating segments | segment			4
Other [Member] | Contracts Accounted for under Percentage-of-Completion [Member] | Joint Venture [Member] | Pacer [Member] | Canadian Dollars [Member]
Segments and Related Information [Line Items]
Project losses (in dollars) | $	$ 0.4	$ 5.1	$ 7.4	$ 5.1

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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Revenue (in dollars)		$ 1,955,752	$ 1,586,181	$ 5,004,116	$ 3,792,811
Communications [Member] | Customer Concentration Risk [Member] | Revenue [Member] | Utilities [Member]
Revenue:
Utilities customers, percentage of Communications segment revenue		13.00%	11.10%	12.60%	10.90%
Reportable Segments [Member] | Communications [Member]
Revenue:
Revenue (in dollars)	[1]	$ 610,500	$ 624,300	$ 1,762,200	$ 1,728,000
Reportable Segments [Member] | Oil and Gas [Member]
Revenue:
Revenue (in dollars)		1,161,000	736,000	2,757,200	1,454,300
Reportable Segments [Member] | Electrical Transmission [Member]
Revenue:
Revenue (in dollars)		81,800	101,700	277,300	283,600
Reportable Segments [Member] | Power Generation and Industrial [Member]
Revenue:
Revenue (in dollars)		96,900	123,600	204,100	324,700
Reportable Segments [Member] | Other [Member]
Revenue:
Revenue (in dollars)		10,600	7,600	14,200	14,900
Eliminations [Member]
Revenue:
Revenue (in dollars)		$ (5,000)	$ (7,000)	$ (10,900)	$ (12,700)

[1] Revenue generated primarily by utilities customers represented 13.0% and 11.1% of Communications segment revenue for the three month periods ended September 30, 2017 and 2016, respectively, and represented 12.6% and 10.9% for the nine month periods ended September 30, 2017 and 2016, respectively.

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Segments and Related Information (Schedule of Financial Information by Reportable Segment - EBITDA) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
EBITDA:
EBITDA	$ 175.3	$ 151.0	$ 497.7	$ 292.6
Reportable Segments [Member] | Communications [Member]
EBITDA:
EBITDA	65.3	62.8	173.2	190.9
Reportable Segments [Member] | Oil and Gas [Member]
EBITDA:
EBITDA	108.1	117.8	356.1	187.6
Reportable Segments [Member] | Electrical Transmission [Member]
EBITDA:
EBITDA	4.5	(8.3)	11.2	(42.0)
Reportable Segments [Member] | Power Generation and Industrial [Member]
EBITDA:
EBITDA	9.3	6.1	14.8	13.8
Reportable Segments [Member] | Other [Member]
EBITDA:
EBITDA	10.1	(3.1)	11.6	(2.6)
Corporate [Member]
EBITDA:
EBITDA	$ (22.0)	$ (24.3)	$ (69.2)	$ (55.1)

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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Depreciation and Amortization:
Depreciation and amortization	$ 50,101	$ 42,584	$ 138,384	$ 122,249
Reportable Segments [Member] | Communications [Member]
Depreciation and Amortization:
Depreciation and amortization	13,800	12,500	39,400	37,200
Reportable Segments [Member] | Oil and Gas [Member]
Depreciation and Amortization:
Depreciation and amortization	26,000	20,700	71,100	58,200
Reportable Segments [Member] | Electrical Transmission [Member]
Depreciation and Amortization:
Depreciation and amortization	5,800	6,100	17,300	17,100
Reportable Segments [Member] | Power Generation and Industrial [Member]
Depreciation and Amortization:
Depreciation and amortization	2,900	1,600	5,800	4,600
Reportable Segments [Member] | Other [Member]
Depreciation and Amortization:
Depreciation and amortization	0	0	100	0
Corporate [Member]
Depreciation and Amortization:
Depreciation and amortization	$ 1,600	$ 1,700	$ 4,700	$ 5,100

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Segments and Related Information (Reconciliation of Consolidated Income before Income Taxes to EBITDA) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
EBITDA Reconciliation:
Income before income taxes	$ 107,579	$ 95,346	$ 314,330	$ 132,417
Interest expense, net	17,578	13,097	44,966	37,895
Depreciation and amortization	50,101	42,584	138,384	122,249
Consolidated EBITDA	$ 175,300	$ 151,000	$ 497,700	$ 292,600

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Segments and Related Information (Foreign Operations) (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segments and Related Information [Line Items]
Revenue			$ 1,955,752	$ 1,586,181	$ 5,004,116	$ 3,792,811
Property and equipment, net	$ 691,430	$ 549,084	691,430		691,430
Intangible assets and goodwill, net	1,330,900	1,175,600	1,330,900		1,330,900
United States [Member]
Segments and Related Information [Line Items]
Revenue			1,900,000	1,500,000	4,800,000	3,600,000
Property and equipment, net	629,200	475,300	629,200		629,200
Intangible assets and goodwill, net	1,200,000	1,100,000	1,200,000		1,200,000
Foreign Operations [Member]
Segments and Related Information [Line Items]
Revenue			61,000	$ 73,800	160,700	$ 222,800
Property and equipment, net	62,200	73,800	62,200		62,200
Intangible assets and goodwill, net	$ 114,300	$ 107,800	$ 114,300		$ 114,300
Foreign Operations [Member] | Accounts Receivable, Net, Less Billings in Excess of Costs and Earnings [Member] | Geographic Concentration Risk [Member] | Foreign Customers [Member]
Segments and Related Information [Line Items]
Concentration risk, percentage of total	6.00%	8.00%

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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Oil and Gas [Member] | Energy Transfer Affiliates [Member]
Revenue, Significant Customers [Line Items]
Significant customers, percentage of total consolidated revenue	[1]	49.00%	35.00%	40.00%	26.00%
Communications [Member] | AT&T (including DIRECTV) [Member]
Revenue, Significant Customers [Line Items]
Significant customers, percentage of total consolidated revenue	[2]	21.00%	30.00%	25.00%	34.00%

[1] The Company's relationship with Energy Transfer affiliates is based upon various construction contracts for pipeline activities with Energy Transfer Partners L.P., and their subsidiaries and affiliates, all of which are consolidated by Energy Transfer Equity, L.P. Revenue from Energy Transfer affiliates is included in the Oil and Gas segment.

[2] The Company’s relationship with AT&T is based upon multiple separate master service and other service agreements, including for installation and maintenance services, as well as construction/installation contracts for AT&T’s: (i) wireless business; (ii) wireline/fiber businesses; and (iii) various install-to-the-home businesses, including DIRECTV®. Revenue from AT&T is included in the Communications segment.

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Commitments and Contingencies (Other Commitments and Contingencies) (Narrative) (Details) CAD in Millions, $ in Millions			3 Months Ended	61 Months Ended
	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2017 CAD	Sep. 30, 2017 USD ($)	Dec. 31, 2016 CAD	Dec. 31, 2016 USD ($)	Nov. 30, 2011 USD ($)
Central States Southeast and Southwest Areas Pension Fund [Member] | Multiemployer Plans, Pension [Member]
Commitments and Contingencies [Line Items]
Multiemployer plans, withdrawal obligation, amount									$ 6.4
Multiemployer plans, withdrawal obligation, payments				$ 6.4
Multiemployer plans, withdrawal obligation, expected settlement, expense			$ 0.6
Self-Insurance [Member] | Workers Compensation, General and Automobile Policies [Member]
Commitments and Contingencies [Line Items]
Self-insurance reserve						$ 98.5		$ 85.8
Self-Insurance [Member] | Workers Compensation, General and Automobile Policies [Member] | Other Long-Term Liabilities [Member]
Commitments and Contingencies [Line Items]
Self-insurance reserve, non-current						67.5		55.2
Self-Insurance [Member] | Workers Compensation, General and Automobile Policies [Member] | Other Long-Term Assets [Member] | Cash [Member]
Commitments and Contingencies [Line Items]
Cash collateral deposited with insurance carriers						1.5		1.5
Self-Insurance [Member] | Employee Group Medical Claims Policies [Member]
Commitments and Contingencies [Line Items]
Self-insurance reserve						$ 2.6		2.6
Joint Ventures [Member] | Joint Ventures That Provide Infrastructure Construction Services For Electrical Transmission Projects [Member]
Commitments and Contingencies [Line Items]
Number of joint ventures					7	7
Joint Ventures [Member] | Joint Ventures That Provide Infrastructure Construction Services For Electrical Transmission Projects [Member] | Minimum [Member]
Commitments and Contingencies [Line Items]
Proportionately consolidated non-controlled joint venture, percentage interest					85.00%	85.00%
Joint Ventures [Member] | Joint Ventures That Provide Infrastructure Construction Services For Electrical Transmission Projects [Member] | Maximum [Member]
Commitments and Contingencies [Line Items]
Proportionately consolidated non-controlled joint venture, percentage interest					90.00%	90.00%
Joint Ventures [Member] | Pacer [Member]
Commitments and Contingencies [Line Items]
Proportionately consolidated non-controlled joint venture, percentage interest					35.00%	35.00%
Performance and Payment Bonds [Member]
Commitments and Contingencies [Line Items]
Outstanding bonds, amount						$ 119.2		72.9
Performance and Payment Bonds [Member] | Joint Ventures [Member] | Pacer [Member]
Commitments and Contingencies [Line Items]
Outstanding bonds, amount | CAD					CAD 132.1		CAD 132.1
Performance and Payment Bonds [Member] | Estimate [Member]
Commitments and Contingencies [Line Items]
Bonded projects, costs to complete	$ 51.3	$ 9.5
Surety Bond [Member] | Self-Insurance [Member] | Workers Compensation [Member]
Commitments and Contingencies [Line Items]
Outstanding bonds, amount						13.7		13.5
Credit Facility [Member]
Commitments and Contingencies [Line Items]
Letters of credit issued						189.1		314.3
Credit Facility [Member] | Financial Guarantees [Member] | Self-Insurance [Member] | Workers Compensation, General and Automobile Policies [Member]
Commitments and Contingencies [Line Items]
Letters of credit issued						$ 84.6		$ 85.1

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Commitments and Contingencies (Other Guarantees) (Narrative) (Details)	9 Months Ended
	Sep. 30, 2017
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. Much of the work performed by the Company is evaluated for defects shortly after the work is completed.
Warranty [Member] | Minimum [Member]
Other Guarantees [Line Items]
Expected term or period (in years)	1 year
Warranty [Member] | Maximum [Member]
Other Guarantees [Line Items]
Expected term or 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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Commitments and Contingencies (Concentrations of Risk) (Narrative) (Details) - customer			3 Months Ended		9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Concentration Risk [Line Items]
Number of customers					455
Accounts Receivable, Net, Less Billings in Excess of Costs and Earnings [Member] | Credit Concentration Risk [Member] | Customer with Highest Net Accounts Receivable Position [Member]
Concentration Risk [Line Items]
Number of customers	1	1
Concentration risk, percentage of total	44.00%	24.00%
Accounts Receivable, Net, Less Billings in Excess of Costs and Earnings [Member] | Credit Concentration Risk [Member] | Customer with Second Highest Net Accounts Receivable Position [Member]
Concentration Risk [Line Items]
Concentration risk, percentage of total	13.00%	17.00%
Revenue [Member] | Customer Concentration Risk [Member] | Ten Largest Customers [Member]
Concentration Risk [Line Items]
Number of customers			10	10	10	10
Concentration risk, percentage of total			83.00%	80.00%	80.00%	76.00%

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Related Party Transactions (Contractual Joint Ventures and Investments) (Narrative) (Details) CAD in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 CAD	Sep. 30, 2017 USD ($)	Dec. 31, 2016 CAD	Dec. 31, 2016 USD ($)
Performance Guarantees [Member]
Related Party Transaction [Line Items]
Guarantees issued, related party						$ 119,200,000		$ 72,900,000
Joint Venture [Member] | Pacer [Member]
Related Party Transaction [Line Items]
Proportionately consolidated non-controlled joint venture, percentage interest					35.00%	35.00%
Joint Venture [Member] | Pacer [Member] | Performance Guarantees [Member]
Related Party Transaction [Line Items]
Guarantees issued, related party | CAD					CAD 132.1		CAD 132.1
Joint Venture [Member] | Pacer [Member] | Canadian Dollars [Member]
Related Party Transaction [Line Items]
Revenue, related party	$ 600,000	$ 200,000	$ 900,000	$ 800,000
Joint Venture [Member] | Pacer [Member] | Canadian Dollars [Member] | Financing Support [Member]
Related Party Transaction [Line Items]
Financing or amounts advanced, related party	2,700,000	$ 800,000	5,900,000	$ 5,600,000
Amounts committed, related party						$ 0
Joint Venture [Member] | Pacer [Member] | Canadian Dollars [Member] | Performance Guarantees [Member]
Related Party Transaction [Line Items]
Guarantees issued, related party						105,900,000		98,300,000
Joint Venture [Member] | Pacer [Member] | Canadian Dollars [Member] | Accounts Receivable [Member]
Related Party Transaction [Line Items]
Receivables, related party						$ 900,000		$ 700,000
Equity Investees [Member] | April 2017 Acquisition [Member]
Related Party Transaction [Line Items]
Financing or amounts advanced, related party			300,000
Equity investment, ownership percentage					40.00%	40.00%
Equity investment, value						$ 400,000
Receivable, related party						300,000
Equity Investees [Member] | April 2017 Acquisition [Member] | Subcontracting Arrangements [Member]
Related Party Transaction [Line Items]
Payments, related party			200,000
Payables, related party						0
Management [Member] | April 2017 Acquisition [Member] | Financing Arrangements [Member]
Related Party Transaction [Line Items]
Payments, related party	$ 1,400,000		$ 5,300,000
Payables, related party						$ 0

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Related Party Transactions (CCI) (Narrative) (Details) - CCI [Member] - Immediate Family Member of Management or Principal Owner [Member] - Equipment [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Payments, related party	$ 22.9	$ 10.0	$ 34.9	$ 13.7
Payables, related party	$ 6.1		$ 6.1		$ 1.5

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Related Party Transactions (Other Related Party Transactions) (Narrative) (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017 USD ($) employee	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) employee	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items]
Distributions to non-controlling interests				$ 1,280	$ 0
Earn-Out Arrangements [Member]
Related Party Transaction [Line Items]
Acquisition-related contingent consideration, new business combinations				$ 89,614	0
Management [Member]
Related Party Transaction [Line Items]
Distributions to non-controlling interests		$ 1,300
Management [Member] | 2017 Oil and Gas Acquisition [Member]
Related Party Transaction [Line Items]
Business combinations, cash payments	$ 40,600
Management [Member] | 2017 Oil and Gas Acquisition [Member] | Earn-Out Arrangements [Member]
Related Party Transaction [Line Items]
Acquisition-related contingent consideration, new business combinations	$ 57,300
Management [Member] | Subcontracting Arrangement, Construction Services [Member]
Related Party Transaction [Line Items]
Number of subsidiaries, non-controlling interests				1
Management [Member] | Subcontracting Arrangement, Construction Services [Member] | Related Contractor [Member]
Related Party Transaction [Line Items]
Number of additional management employees, subcontracting arrangement | employee	2			2
Payments, related party	$ 39,200		$ 5,600	$ 54,800	8,800
Payables, related party	20,100			20,100		$ 100
Management [Member] | Equipment [Member] | Related Contractor [Member]
Related Party Transaction [Line Items]
Proceeds from sale of equipment, related party			300
Management [Member] | Service Agreements [Member]
Related Party Transaction [Line Items]
Payments, related party	26,400		7,400	41,000	14,200
Payables, related party	800			800		3,700
Management [Member] | Lease Agreements [Member]
Related Party Transaction [Line Items]
Payments, related party	11,300		12,500	38,400	31,600
Payables, related party	600			600		300
Management [Member] | Construction Contracts [Member]
Related Party Transaction [Line Items]
Revenue, related party	1,000
Accounts receivable, related party	500			500
Executive Officers [Member] | Employee Leasing Arrangements [Member] | Related Customer [Member]
Related Party Transaction [Line Items]
Charges, related party	200		200	600	600
Receivables, related party	200			200		200
Executive Officers [Member] | Service Agreements [Member] | Related Customer [Member]
Related Party Transaction [Line Items]
Revenue, related party	200		200	600	700
Accounts receivable, related party	300			300		$ 400
Chairman, Board of Directors [Member] | Lease Agreements [Member] | Aircraft [Member]
Related Party Transaction [Line Items]
Payments, related party	$ 500		$ 700	$ 1,500	$ 2,000

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Related Party Transactions (Split Dollar Agreements) (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Payments for life insurance policies	$ 0	$ 0	$ 700,000	$ 700,000
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	$ 16,600,000		$ 16,600,000		$ 14,800,000

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Supplemental Guarantor Financial Information (Narrative) (Details)	Sep. 30, 2017
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 (Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items]
Revenue		$ 1,955,752	$ 1,586,181	$ 5,004,116	$ 3,792,811
Costs of revenue, excluding depreciation and amortization		1,726,173	1,368,988	4,323,642	3,321,571
Depreciation and amortization		50,101	42,584	138,384	122,249
General and administrative expenses		66,397	67,131	202,001	195,031
Interest expense (income), net		17,578	13,097	44,966	37,895
Equity in earnings of unconsolidated affiliates		(7,399)	6	(15,105)	(3,549)
Other (income) expense, net		(4,677)	(971)	(4,102)	(12,803)
Income before income taxes		107,579	95,346	314,330	132,417
(Provision for) benefit from income taxes		(43,378)	(38,816)	(126,170)	(54,331)
Net income (loss) before equity in income from subsidiaries		64,200	56,500	188,200	78,100
Equity in income (losses) from subsidiaries, net of tax		0	0	0	0
Net income		64,201	56,530	188,160	78,086
Net income attributable to non-controlling interests		449	253	1,770	414
Net income attributable to MasTec, Inc.	[1]	63,752	56,277	186,390	77,672
Comprehensive income (loss)		65,650	54,731	189,288	69,571
Reportable Legal Entities [Member] | MasTec, Inc. [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss) [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		500	600	1,700	1,700
Interest expense (income), net		0	0	0	0
Equity in earnings of unconsolidated affiliates		0	0	0	0
Other (income) expense, net		0	0	0	0
Income before income taxes		(500)	(600)	(1,700)	(1,700)
(Provision for) benefit from income taxes		200	200	600	600
Net income (loss) before equity in income from subsidiaries		(300)	(400)	(1,100)	(1,100)
Equity in income (losses) from subsidiaries, net of tax		64,100	56,700	187,500	78,800
Net income		63,800	56,300	186,400	77,700
Net income attributable to non-controlling interests		0	0	0	0
Net income attributable to MasTec, Inc.		63,800	56,300	186,400	77,700
Comprehensive income (loss)		65,200	54,500	187,500	69,200
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items]
Revenue		1,860,300	1,493,900	4,763,400	3,521,500
Costs of revenue, excluding depreciation and amortization		1,640,300	1,282,300	4,097,700	3,054,500
Depreciation and amortization		41,100	33,700	112,200	96,600
General and administrative expenses		61,700	60,600	187,700	172,100
Interest expense (income), net		33,200	28,600	91,500	83,800
Equity in earnings of unconsolidated affiliates		0	0	0	0
Other (income) expense, net		(4,600)	(3,400)	(9,900)	(12,700)
Income before income taxes		88,600	92,100	284,200	127,200
(Provision for) benefit from income taxes		(33,800)	(33,400)	(104,900)	(47,300)
Net income (loss) before equity in income from subsidiaries		54,800	58,700	179,300	79,900
Equity in income (losses) from subsidiaries, net of tax		0	0	0	0
Net income		54,800	58,700	179,300	79,900
Net income attributable to non-controlling interests		0	0	0	0
Net income attributable to MasTec, Inc.		54,800	58,700	179,300	79,900
Comprehensive income (loss)		54,900	58,700	179,300	79,900
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items]
Revenue		130,300	112,700	347,400	302,200
Costs of revenue, excluding depreciation and amortization		120,700	107,200	332,600	298,000
Depreciation and amortization		9,000	8,900	26,200	25,600
General and administrative expenses		4,200	5,900	12,600	21,200
Interest expense (income), net		(15,600)	(15,500)	(46,500)	(45,900)
Equity in earnings of unconsolidated affiliates		(7,400)	0	(15,100)	(3,500)
Other (income) expense, net		(100)	2,300	5,800	(100)
Income before income taxes		19,500	3,900	31,800	6,900
(Provision for) benefit from income taxes		(9,900)	(5,600)	(21,900)	(7,600)
Net income (loss) before equity in income from subsidiaries		9,600	(1,700)	9,900	(700)
Equity in income (losses) from subsidiaries, net of tax		0	0	0	0
Net income		9,600	(1,700)	9,900	(700)
Net income attributable to non-controlling interests		400	300	1,800	400
Net income attributable to MasTec, Inc.		9,200	(2,000)	8,100	(1,100)
Comprehensive income (loss)		11,100	(3,600)	11,100	(9,200)
Eliminations [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items]
Revenue		(34,800)	(20,400)	(106,700)	(30,900)
Costs of revenue, excluding depreciation and amortization		(34,800)	(20,400)	(106,700)	(30,900)
Depreciation and amortization		0	0	0	0
General and administrative expenses		0	0	0	0
Interest expense (income), net		0	0	0	0
Equity in earnings of unconsolidated affiliates		0	0	0	0
Other (income) expense, net		0	0	0	0
Income before income taxes		0	0	0	0
(Provision for) benefit from income taxes		0	0	0	0
Net income (loss) before equity in income from subsidiaries		0	0	0	0
Equity in income (losses) from subsidiaries, net of tax		(64,100)	(56,700)	(187,500)	(78,800)
Net income		(64,100)	(56,700)	(187,500)	(78,800)
Net income attributable to non-controlling interests		0	0	0	0
Net income attributable to MasTec, Inc.		(64,100)	(56,700)	(187,500)	(78,800)
Comprehensive income (loss)		$ (65,500)	$ (54,900)	$ (188,600)	$ (70,300)

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

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Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets
Total current assets	$ 1,747,747	$ 1,402,486
Property and equipment, net	691,430	549,084
Goodwill and other intangible assets, net	1,330,900	1,175,600
Investments in and advances to consolidated affiliates, net	0	0
Other long-term assets	172,094	55,977
Total assets	3,942,175	3,183,132
Liabilities and equity
Total current liabilities	1,002,151	839,990
Long-term debt	1,192,311	961,379
Other long-term liabilities	444,700	278,100
Total liabilities	2,639,130	2,079,498
Total equity	1,303,045	1,103,634
Total liabilities and equity	3,942,175	3,183,132
Reportable Legal Entities [Member] | MasTec, Inc. [Member]
Assets
Total 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	1,279,700	1,083,900
Other long-term assets	15,800	12,600
Total assets	1,295,500	1,096,500
Liabilities and equity
Total current liabilities	0	0
Long-term debt	0	0
Other long-term liabilities	0	0
Total liabilities	0	0
Total equity	1,295,500	1,096,500
Total liabilities and equity	1,295,500	1,096,500
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Assets
Total current assets	1,576,000	1,256,300
Property and equipment, net	600,800	456,600
Goodwill and other intangible assets, net	1,187,900	1,037,400
Investments in and advances to consolidated affiliates, net	848,000	625,900
Other long-term assets	25,700	25,300
Total assets	4,238,400	3,401,500
Liabilities and equity
Total current liabilities	982,500	759,700
Long-term debt	1,181,100	938,700
Other long-term liabilities	432,000	256,200
Total liabilities	2,595,600	1,954,600
Total equity	1,642,800	1,446,900
Total liabilities and equity	4,238,400	3,401,500
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Assets
Total current assets	259,800	175,800
Property and equipment, net	90,600	92,500
Goodwill and other intangible assets, net	143,000	138,200
Investments in and advances to consolidated affiliates, net	710,200	861,200
Other long-term assets	130,600	18,000
Total assets	1,334,200	1,285,700
Liabilities and equity
Total current liabilities	107,700	109,900
Long-term debt	11,200	22,700
Other long-term liabilities	12,700	21,900
Total liabilities	131,600	154,500
Total equity	1,202,600	1,131,200
Total liabilities and equity	1,334,200	1,285,700
Eliminations [Member]
Assets
Total current assets	(88,100)	(29,600)
Property and equipment, net	0	0
Goodwill and other intangible assets, net	0	0
Investments in and advances to consolidated affiliates, net	(2,837,900)	(2,571,000)
Other long-term assets	0	0
Total assets	(2,926,000)	(2,600,600)
Liabilities and equity
Total current liabilities	(88,100)	(29,600)
Long-term debt	0	0
Other long-term liabilities	0	0
Total liabilities	(88,100)	(29,600)
Total equity	(2,837,900)	(2,571,000)
Total liabilities and equity	$ (2,926,000)	$ (2,600,600)

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Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	$ 178,625	$ 127,141
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(115,995)	(4,102)
Capital expenditures	(83,330)	(89,050)
Proceeds from sale of property and equipment	13,585	6,824
Payments for other investments	(77,105)	(8,858)
Proceeds from other investments	13,416	1,125
Net cash used in investing activities	(249,429)	(94,061)
Cash flows from financing activities:
Proceeds from credit facilities	2,002,430	1,186,816
Repayments of credit facilities	(1,840,409)	(1,149,930)
Repayments of other borrowings and capital lease obligations	(60,800)	(50,000)
Payments of acquisition-related contingent consideration	(18,843)	(19,822)
Distributions to non-controlling interests	(1,280)	0
Proceeds from stock-based awards, net	853	3,938
Other financing activities, net	(6,301)	1,385
Net financing activities and advances (to) from consolidated affiliates	0	0
Net cash provided by (used in) financing activities	75,622	(27,629)
Effect of currency translation on cash	237	(1,008)
Net increase in cash and cash equivalents	5,055	4,443
Cash and cash equivalents - beginning of period	38,767	4,984
Cash and cash equivalents - end of period	43,822	9,427
Reportable Legal Entities [Member] | MasTec, Inc. [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	0	0
Cash flows from 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 other investments	0	0
Proceeds from other investments	0	0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Proceeds from credit facilities	0	0
Repayments of credit facilities	0	0
Repayments of other borrowings and capital lease obligations	0	0
Payments of acquisition-related contingent consideration	0	0
Distributions to non-controlling interests	0
Proceeds from stock-based awards, net	900	3,400
Other financing activities, net	0	1,400
Net financing activities and advances (to) from consolidated affiliates	(900)	(4,800)
Net cash provided by (used in) financing activities	0	0
Effect of currency translation on cash	0	0
Net increase 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 provided by (used in) operating activities	222,000	87,200
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(116,000)	(4,100)
Capital expenditures	(70,000)	(84,000)
Proceeds from sale of property and equipment	12,500	3,100
Payments for other investments	(3,800)	(3,800)
Proceeds from other investments	1,200	0
Net cash used in investing activities	(176,100)	(88,800)
Cash flows from financing activities:
Proceeds from credit facilities	1,988,100	1,093,800
Repayments of credit facilities	(1,817,400)	(1,056,100)
Repayments of other borrowings and capital lease obligations	(52,600)	(37,600)
Payments of acquisition-related contingent consideration	(18,800)	(16,500)
Distributions to non-controlling interests	0
Proceeds from stock-based awards, net	0	0
Other financing activities, net	(6,300)	0
Net financing activities and advances (to) from consolidated affiliates	(131,900)	15,100
Net cash provided by (used in) financing activities	(38,900)	(1,300)
Effect of currency translation on cash	0	0
Net increase in cash and cash equivalents	7,000	(2,900)
Cash and cash equivalents - beginning of period	28,300	4,700
Cash and cash equivalents - end of period	35,300	1,800
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	(43,400)	39,900
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	0	0
Capital expenditures	(13,300)	(5,100)
Proceeds from sale of property and equipment	1,100	3,700
Payments for other investments	(73,300)	(5,000)
Proceeds from other investments	12,200	1,100
Net cash used in investing activities	(73,300)	(5,300)
Cash flows from financing activities:
Proceeds from credit facilities	14,300	93,000
Repayments of credit facilities	(23,000)	(93,800)
Repayments of other borrowings and capital lease obligations	(8,300)	(12,400)
Payments of acquisition-related contingent consideration	0	(3,300)
Distributions to non-controlling interests	(1,300)
Proceeds from stock-based awards, net	0	500
Other financing activities, net	0	0
Net financing activities and advances (to) from consolidated affiliates	132,800	(10,300)
Net cash provided by (used in) financing activities	114,500	(26,300)
Effect of currency translation on cash	200	(1,000)
Net increase in cash and cash equivalents	(2,000)	7,300
Cash and cash equivalents - beginning of period	10,500	300
Cash and cash equivalents - end of period	8,500	7,600
Eliminations [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash provided by (used in) operating activities	0	0
Cash flows from 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 other investments	0	0
Proceeds from other investments	0	0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Proceeds from credit facilities	0	0
Repayments of credit facilities	0	0
Repayments of other borrowings and capital lease obligations	0	0
Payments of acquisition-related contingent consideration	0	0
Distributions to non-controlling interests	0
Proceeds from stock-based awards, net	0	0
Other financing activities, net	0	0
Net financing activities and advances (to) from consolidated affiliates	0	0
Net cash provided by (used in) financing activities	0	0
Effect of currency translation on cash	0	0
Net increase 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