Number of persons employed by the Entity

No definition available.

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- Definition

Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Balance Type:	credit
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- Definition

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3
-Subparagraph a
-Article 5

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

For an unclassified balance sheet, amounts due from related parties other than affiliates, employees, joint ventures, officers or stockholders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
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Balance Type:	debit
Period Type:	instant

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
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-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Subparagraph (SX 210.6-07.1(c))
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- Details

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- Details

Name:	us-gaap_RelatedPartyTransactionAxis=us-gaap_ConstructionContractsMember
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- Details

Name:	us-gaap_MajorCustomersAxis=mtz_RelatedCustomerMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=us-gaap_EmploymentContractsMember
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Balance Type:
Period Type:

- Details

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- Details

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Period Type:

- Details

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- Details

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- Details

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Related Party Transactions (Other Related Party Transactions) (Narrative) (Details)	3 Months Ended
	Mar. 31, 2016 USD ($) employee	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Executive Officers [Member] \| Subcontractor Ancillary Services [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 1,500,000
Accounts payable, related party	1,200,000
Executive Officers [Member] \| Related Customer [Member] \| Employee Leasing Arrangements [Member]
Related Party Transaction [Line Items]
Charges to related party	200,000	$ 200,000
Due from related party	100,000		$ 100,000
Executive Officers [Member] \| Related Customer [Member] \| Service Agreements [Member]
Related Party Transaction [Line Items]
Revenue, related party	200,000	200,000
Accounts receivable, related party	400,000		300,000
Chairman, Board of Directors [Member] \| Lease Agreements [Member] \| Aircraft [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 700,000	0
Management [Member] \| Subcontractor Ancillary Services [Member]
Related Party Transaction [Line Items]
Number of other management employees in subcontracting arrangement \| employee	2
Management [Member] \| Service Agreements [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 3,100,000	900,000
Accounts payable, related party	1,000,000		2,100,000
Management [Member] \| Lease Agreements [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	9,100,000	$ 5,300,000
Accounts payable, related party	$ 800,000		$ 100,000