Supplemental Guarantor Condensed Unaudited Consolidating Financial Information (Condensed Unaudited Consolidating Statements Of Cash Flows) (Details) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	$ 55,319,000	$ 22,857,000
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	(162,901,000)	(120,544,000)
Capital expenditures	(67,566,000)	(57,527,000)
Proceeds from sale of property and equipment	8,752,000	5,123,000
Proceeds from other investments, net	573,000	4,931,000
Net cash used in investing activities	(221,142,000)	(168,017,000)
Cash flows provided by (used in) financing activities:
Proceeds from credit facility	815,840,000	499,666,000
Repayments of credit facility	(463,713,000)	(558,596,000)
(Repayments of) proceeds from senior notes, including convertible notes	(105,300,000)	250,000,000
Repayments of other borrowings and capital lease obligations	(30,200,000)	(39,700,000)
Payments of financing costs, including call premiums on extinguishment of debt	(1,298,000)	(11,685,000)
Net financing activities and advances (to) from consolidated affiliates	0	0
Net cash provided by financing activities	159,167,000	132,272,000
Net decrease in cash and cash equivalents	(6,656,000)	(12,888,000)
Net effect of currency translation on cash	(347,000)	(274,000)
Cash and cash equivalents - beginning of period	22,927,000	26,767,000
Cash and cash equivalents - end of period	15,924,000	13,605,000
Cash and cash equivalents of discontinued operations	0	310,000
Cash and cash equivalents of continuing operations	15,924,000	13,295,000
Earn-Out Arrangements [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities	(58,902,000)	(12,848,000)
Stock Compensation Plan [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities	2,800,000	5,400,000
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
Proceeds from other investments, net	0	0
Net cash used in investing activities	0	0
Cash flows provided by (used in) financing activities:
Proceeds from credit facility	0	0
Repayments of credit facility	0	0
(Repayments of) proceeds from senior notes, including convertible notes	0	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 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	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	(700,000)	(900,000)
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
Proceeds from other investments, net	0	0
Net cash used in investing activities	0	0
Cash flows provided by (used in) financing activities:
Proceeds from credit facility	0	0
Repayments of credit facility	0	0
(Repayments of) proceeds from senior notes, including convertible notes	0	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	(1,300,000)	(3,300,000)
Net cash provided by financing activities	700,000	900,000
Net decrease 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	0
MasTec, Inc. [Member] | Stock Compensation Plan [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities	2,000,000	4,200,000
Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	23,200,000	31,000,000
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	(39,900,000)	(120,500,000)
Capital expenditures	(59,200,000)	(47,500,000)
Proceeds from sale of property and equipment	8,000,000	5,000,000
Proceeds from other investments, net	600,000	4,900,000
Net cash used in investing activities	(90,500,000)	(158,100,000)
Cash flows provided by (used in) financing activities:
Proceeds from credit facility	776,000,000	451,000,000
Repayments of credit facility	(430,400,000)	(514,400,000)
(Repayments of) proceeds from senior notes, including convertible notes	(105,300,000)	250,000,000
Repayments of other borrowings and capital lease obligations	(28,400,000)	(39,300,000)
Payments of financing costs, including call premiums on extinguishment of debt	(1,300,000)	(11,700,000)
Net financing activities and advances (to) from consolidated affiliates	(79,400,000)	(6,400,000)
Net cash provided by financing activities	73,100,000	117,600,000
Net decrease in cash and cash equivalents	5,800,000	(9,500,000)
Net effect of currency translation on cash	0	0
Cash and cash equivalents - beginning of period	5,300,000	12,700,000
Cash and cash equivalents - end of period	11,100,000	3,200,000
Cash and cash equivalents of discontinued operations	0	0
Cash and cash equivalents of continuing operations	11,100,000	3,200,000
Guarantor Subsidiaries [Member] | Earn-Out Arrangements [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities	(58,900,000)	(12,800,000)
Guarantor Subsidiaries [Member] | Stock Compensation Plan [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities	800,000	1,200,000
Non-Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	32,800,000	(7,200,000)
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	(123,000,000)	0
Capital expenditures	(8,400,000)	(10,000,000)
Proceeds from sale of property and equipment	800,000	100,000
Proceeds from other investments, net	0	0
Net cash used in investing activities	(130,600,000)	(9,900,000)
Cash flows provided by (used in) financing activities:
Proceeds from credit facility	39,800,000	48,700,000
Repayments of credit facility	(33,300,000)	(44,200,000)
(Repayments of) proceeds from senior notes, including convertible notes	0	0
Repayments of other borrowings and capital lease obligations	(1,800,000)	(400,000)
Payments of financing costs, including call premiums on extinguishment of debt	0	0
Net financing activities and advances (to) from consolidated affiliates	80,700,000	9,700,000
Net cash provided by financing activities	85,400,000	13,800,000
Net decrease in cash and cash equivalents	(12,400,000)	(3,300,000)
Net effect of currency translation on cash	(400,000)	(300,000)
Cash and cash equivalents - beginning of period	17,600,000	14,000,000
Cash and cash equivalents - end of period	4,800,000	10,400,000
Cash and cash equivalents of discontinued operations	0	300,000
Cash and cash equivalents of continuing operations	4,800,000	10,100,000
Non-Guarantor Subsidiaries [Member] | Earn-Out Arrangements [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities	0	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