Supplemental Guarantor Condensed Unaudited Consolidating Financial Information (Condensed Unaudited Consolidating Statements Of Cash Flows) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	$ (20,394,000)	$ 26,130,000
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	(23,831,000)	(4,653,000)
Capital expenditures	(35,554,000)	(25,851,000)
Proceeds from sale of property and equipment	3,373,000	3,411,000
Payments for other investments	(1,098,000)	0
Net cash used in investing activities	(57,110,000)	(27,093,000)
Cash flows provided by (used in) financing activities:
Proceeds from (repayments of) credit facility	76,500,000	(134,000,000)
Proceeds from senior notes, net		250,000,000
Repayments of other borrowings and capital lease obligations	(13,800,000)	(19,100,000)
Payments of financing costs, including call premiums on extinguishment of debt	(218,000)	(10,968,000)
Net financing activities and advances (to) from consolidated affiliates	0	0
Net cash provided by financing activities	64,314,000	84,365,000
Net (decrease) increase in cash and cash equivalents	(13,190,000)	83,402,000
Net effect of currency translation on cash	(476,000)	(60,000)
Cash and cash equivalents - beginning of period	22,927,000	26,767,000
Cash and cash equivalents - end of period	9,261,000	110,109,000
Cash and cash equivalents of discontinued operations	0	862,000
Cash and cash equivalents of continuing operations	9,261,000	109,247,000
Earn-out Arrangements [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities	0	(5,003,000)
Stock Compensation Plan [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities	1,800,000	3,500,000
Eliminations [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	0	0
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	0	0
Capital expenditures	0	0
Proceeds from sale of property and equipment	0	0
Payments for other investments	0
Net cash used in investing activities	0	0
Cash flows provided by (used in) financing activities:
Proceeds from (repayments of) credit facility	0	0
Proceeds from senior notes, net		0
Repayments of other borrowings and capital lease obligations	0	0
Payments of financing costs, including call premiums on extinguishment of debt	0	0
Net financing activities and advances (to) from consolidated affiliates	0	0
Net cash provided by financing activities	0	0
Net (decrease) increase in cash and cash equivalents	0	0
Net effect of currency translation on cash	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0
Cash and cash equivalents of discontinued operations	0	0
Cash and cash equivalents of continuing operations	0	0
Eliminations [Member] | Earn-out Arrangements [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities		0
Eliminations [Member] | Stock Compensation Plan [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities	0	0
MasTec, Inc. [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	(300,000)	(600,000)
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	0	0
Capital expenditures	0	0
Proceeds from sale of property and equipment	0	0
Payments for other investments	0
Net cash used in investing activities	0	0
Cash flows provided by (used in) financing activities:
Proceeds from (repayments of) credit facility	0	0
Proceeds from senior notes, net		0
Repayments of other borrowings and capital lease obligations	0	0
Payments of financing costs, including call premiums on extinguishment of debt	0	0
Net financing activities and advances (to) from consolidated affiliates	(800,000)	(2,200,000)
Net cash provided by financing activities	300,000	600,000
Net (decrease) increase in cash and cash equivalents	0	0
Net effect of currency translation on cash	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0
Cash and cash equivalents of discontinued operations	0	0
Cash and cash equivalents of continuing operations	0	0
MasTec, Inc. [Member] | Earn-out Arrangements [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities		0
MasTec, Inc. [Member] | Stock Compensation Plan [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities	1,100,000	2,800,000
Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	15,200,000	50,300,000
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	(23,800,000)	(4,700,000)
Capital expenditures	(32,600,000)	(25,400,000)
Proceeds from sale of property and equipment	3,400,000	3,400,000
Payments for other investments	(1,100,000)
Net cash used in investing activities	(54,100,000)	(26,700,000)
Cash flows provided by (used in) financing activities:
Proceeds from (repayments of) credit facility	76,500,000	(134,000,000)
Proceeds from senior notes, net		250,000,000
Repayments of other borrowings and capital lease obligations	(12,900,000)	(19,100,000)
Payments of financing costs, including call premiums on extinguishment of debt	(200,000)	(11,000,000)
Net financing activities and advances (to) from consolidated affiliates	(24,700,000)	(12,900,000)
Net cash provided by financing activities	39,400,000	68,700,000
Net (decrease) increase in cash and cash equivalents	500,000	92,300,000
Net effect of currency translation on cash	0	(100,000)
Cash and cash equivalents - beginning of period	5,300,000	12,700,000
Cash and cash equivalents - end of period	5,800,000	104,900,000
Cash and cash equivalents of discontinued operations	0	0
Cash and cash equivalents of continuing operations	5,800,000	104,900,000
Guarantor Subsidiaries [Member] | Earn-out Arrangements [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities		(5,000,000)
Guarantor Subsidiaries [Member] | Stock Compensation Plan [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities	700,000	700,000
Non-Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	(35,300,000)	(23,600,000)
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	0	0
Capital expenditures	(3,000,000)	(400,000)
Proceeds from sale of property and equipment	0	0
Payments for other investments	0
Net cash used in investing activities	(3,000,000)	(400,000)
Cash flows provided by (used in) financing activities:
Proceeds from (repayments of) credit facility	0	0
Proceeds from senior notes, net		0
Repayments of other borrowings and capital lease obligations	(900,000)	0
Payments of financing costs, including call premiums on extinguishment of debt	0	0
Net financing activities and advances (to) from consolidated affiliates	25,500,000	15,100,000
Net cash provided by financing activities	24,600,000	15,100,000
Net (decrease) increase in cash and cash equivalents	(13,700,000)	(8,900,000)
Net effect of currency translation on cash	(500,000)	0
Cash and cash equivalents - beginning of period	17,700,000	14,100,000
Cash and cash equivalents - end of period	3,500,000	5,200,000
Cash and cash equivalents of discontinued operations	0	900,000
Cash and cash equivalents of continuing operations	3,500,000	4,300,000
Non-Guarantor Subsidiaries [Member] | Earn-out Arrangements [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities		0
Non-Guarantor Subsidiaries [Member] | Stock Compensation Plan [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities	$ 0	$ 0