Supplemental Guarantor Condensed Unaudited Consolidating Financial Information (Condensed Unaudited Consolidating Statements of Cash Flows) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	$ 81,019,000	$ 129,256,000
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	(162,901,000)	(146,598,000)
Capital expenditures	(90,962,000)	(101,411,000)
Proceeds from sale of property and equipment	12,204,000	8,288,000
Proceeds from disposal of business, net of cash divested	0	(4,332,000)
(Payments for) proceeds from other investments, net	(1,046,000)	3,852,000
Net cash used in investing activities	(242,705,000)	(240,201,000)
Cash flows provided by (used in) financing activities:
Proceeds from credit facility	1,319,623,000	766,154,000
Repayments of credit facility	(955,151,000)	(860,070,000)
(Repayments of) proceeds from senior notes, including convertible notes	(105,300,000)	250,000,000
Repayments of other borrowings and capital lease obligations	(54,100,000)	(56,500,000)
Payments of financing costs, including call premiums on extinguishment of debt	(1,455,000)	(11,835,000)
Net financing activities and advances (to) from consolidated affiliates	0	0
Net cash provided by financing activities	146,978,000	87,144,000
Effect of currency translation on cash	(1,152,000)	(118,000)
Net decrease in cash and cash equivalents	(15,860,000)	(23,919,000)
Cash and cash equivalents - beginning of period	22,927,000	26,767,000
Cash and cash equivalents - end of period	7,067,000	2,848,000
Earn-Out Arrangements [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities	(60,341,000)	(12,848,000)
Stock Compensation Plan [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities	3,800,000	12,200,000
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 disposal of business, net of cash divested		0
(Payments for) 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
Effect of currency translation on cash	0	0
Net decrease in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0
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	(1,100,000)	(2,400,000)
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 disposal of business, net of cash divested		0
(Payments for) 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	(1,800,000)	(6,800,000)
Net cash provided by financing activities	1,100,000	2,400,000
Effect of currency translation on cash	0	0
Net decrease in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0
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	2,900,000	9,200,000
Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	39,600,000	103,200,000
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	(39,900,000)	(43,000,000)
Capital expenditures	(75,600,000)	(96,800,000)
Proceeds from sale of property and equipment	10,300,000	7,600,000
Proceeds from disposal of business, net of cash divested		(4,300,000)
(Payments for) proceeds from other investments, net	(1,000,000)	3,800,000
Net cash used in investing activities	(106,200,000)	(132,700,000)
Cash flows provided by (used in) financing activities:
Proceeds from credit facility	1,122,400,000	639,600,000
Repayments of credit facility	(723,200,000)	(737,200,000)
(Repayments of) proceeds from senior notes, including convertible notes	(105,300,000)	250,000,000
Repayments of other borrowings and capital lease obligations	(45,300,000)	(55,500,000)
Payments of financing costs, including call premiums on extinguishment of debt	(1,500,000)	(11,800,000)
Net financing activities and advances (to) from consolidated affiliates	(124,100,000)	(56,400,000)
Net cash provided by financing activities	63,600,000	18,900,000
Effect of currency translation on cash	0	0
Net decrease in cash and cash equivalents	(3,000,000)	(10,600,000)
Cash and cash equivalents - beginning of period	5,300,000	12,700,000
Cash and cash equivalents - end of period	2,300,000	2,100,000
Guarantor Subsidiaries [Member] | Earn-Out Arrangements [Member]
Cash flows provided by (used in) financing activities:
Proceeds from (payments for) other financing activities	(60,300,000)	(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	900,000	3,000,000
Non-Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	42,500,000	28,500,000
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	(123,000,000)	(103,600,000)
Capital expenditures	(15,400,000)	(4,600,000)
Proceeds from sale of property and equipment	1,900,000	700,000
Proceeds from disposal of business, net of cash divested		0
(Payments for) proceeds from other investments, net	0	0
Net cash used in investing activities	(136,500,000)	(107,500,000)
Cash flows provided by (used in) financing activities:
Proceeds from credit facility	197,200,000	126,600,000
Repayments of credit facility	(232,000,000)	(123,000,000)
(Repayments of) proceeds from senior notes, including convertible notes	0	0
Repayments of other borrowings and capital lease obligations	(8,800,000)	(1,000,000)
Payments of financing costs, including call premiums on extinguishment of debt	0	0
Net financing activities and advances (to) from consolidated affiliates	125,900,000	63,200,000
Net cash provided by financing activities	82,300,000	65,800,000
Effect of currency translation on cash	(1,200,000)	(100,000)
Net decrease in cash and cash equivalents	(12,900,000)	(13,300,000)
Cash and cash equivalents - beginning of period	17,700,000	14,000,000
Cash and cash equivalents - end of period	4,800,000	700,000
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