Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Statements Of Cash Flows) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 31,816	$ 43,445
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net, including contingent consideration	(9,656)	(4,498)
Capital expenditures	(25,851)	(14,097)
Proceeds from sale of assets	3,411	2,014
Net cash (used in) provided by investing activities	(32,096)	(16,581)
Cash flows provided by (used in) financing activities:
Proceeds from issuance of 4.875% senior notes	400,000	0
Repayment of 7.625% senior notes	(150,000)	0
Proceeds from credit facility	231,600	166,700
Repayments of credit facility	(365,600)	(195,950)
Repayments of other borrowings	(7,683)	(5,323)
(Repayments of) proceeds from book overdrafts	(5,970)	10,433
Payments of capital lease obligations	(11,438)	(4,185)
Proceeds from stock option exercises and other share-based awards	2,838	1,218
Excess tax benefit from stock-based compensation	903	97
Payments for debt extinguishment, call premiums	(4,116)	0
Payments of financing costs	(6,852)	(52)
Net financing activities and advances (to) from consolidated affiliates	0	0
Net cash provided by (used in) financing activities	83,682	(27,062)
Net increase (decrease) in cash and cash equivalents	83,402	(198)
Net effect of currency translation on cash	(60)	49
Cash and cash equivalents - beginning of period	26,767	20,280
Cash and cash equivalents - end of period	110,109	20,131
Cash and cash equivalents of discontinued operations	862	4,286
Cash and cash equivalents of continuing operations	109,247	15,845
MasTec, Inc. [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(894)	(466)
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net, including contingent consideration	0	0
Capital expenditures	0	0
Proceeds from sale of assets	0	0
Net cash (used in) provided by investing activities	0	0
Cash flows provided by (used in) financing activities:
Proceeds from issuance of 4.875% senior notes	0
Repayment of 7.625% senior notes	0
Proceeds from credit facility	0	0
Repayments of credit facility	0	0
Repayments of other borrowings	0	0
(Repayments of) proceeds from book overdrafts	0	0
Payments of capital lease obligations	0	0
Proceeds from stock option exercises and other share-based awards	2,838	1,218
Excess tax benefit from stock-based compensation	0	0
Payments for debt extinguishment, call premiums	0
Payments of financing costs	0	0
Net financing activities and advances (to) from consolidated affiliates	(1,944)	(752)
Net cash provided by (used in) financing activities	894	466
Net increase (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
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	74,980	63,916
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net, including contingent consideration	(9,656)	(4,498)
Capital expenditures	(25,782)	(13,530)
Proceeds from sale of assets	3,340	2,014
Net cash (used in) provided by investing activities	(32,098)	(16,014)
Cash flows provided by (used in) financing activities:
Proceeds from issuance of 4.875% senior notes	400,000
Repayment of 7.625% senior notes	(150,000)
Proceeds from credit facility	231,600	166,700
Repayments of credit facility	(365,600)	(195,950)
Repayments of other borrowings	(7,683)	(5,323)
(Repayments of) proceeds from book overdrafts	(5,970)	10,433
Payments of capital lease obligations	(11,427)	(4,177)
Proceeds from stock option exercises and other share-based awards	0	0
Excess tax benefit from stock-based compensation	903	97
Payments for debt extinguishment, call premiums	(4,116)
Payments of financing costs	(6,852)	(52)
Net financing activities and advances (to) from consolidated affiliates	(32,773)	(25,371)
Net cash provided by (used in) financing activities	48,082	(53,643)
Net increase (decrease) in cash and cash equivalents	90,964	(5,741)
Net effect of currency translation on cash	0	0
Cash and cash equivalents - beginning of period	17,827	16,240
Cash and cash equivalents - end of period	108,791	10,499
Cash and cash equivalents of discontinued operations	739	4,026
Cash and cash equivalents of continuing operations	108,052	6,473
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(42,270)	(20,005)
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net, including contingent consideration	0	0
Capital expenditures	(69)	(567)
Proceeds from sale of assets	71	0
Net cash (used in) provided by investing activities	2	(567)
Cash flows provided by (used in) financing activities:
Proceeds from issuance of 4.875% senior notes	0
Repayment of 7.625% senior notes	0
Proceeds from credit facility	0	0
Repayments of credit facility	0	0
Repayments of other borrowings	0	0
(Repayments of) proceeds from book overdrafts	0	0
Payments of capital lease obligations	(11)	(8)
Proceeds from stock option exercises and other share-based awards	0	0
Excess tax benefit from stock-based compensation	0	0
Payments for debt extinguishment, call premiums	0
Payments of financing costs	0	0
Net financing activities and advances (to) from consolidated affiliates	34,717	26,123
Net cash provided by (used in) financing activities	34,706	26,115
Net increase (decrease) in cash and cash equivalents	(7,562)	5,543
Net effect of currency translation on cash	(60)	49
Cash and cash equivalents - beginning of period	8,940	4,040
Cash and cash equivalents - end of period	1,318	9,632
Cash and cash equivalents of discontinued operations	123	260
Cash and cash equivalents of continuing operations	1,195	9,372
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	0	0
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net, including contingent consideration	0	0
Capital expenditures	0	0
Proceeds from sale of assets	0	0
Net cash (used in) provided by investing activities	0	0
Cash flows provided by (used in) financing activities:
Proceeds from issuance of 4.875% senior notes	0
Repayment of 7.625% senior notes	0
Proceeds from credit facility	0	0
Repayments of credit facility	0	0
Repayments of other borrowings	0	0
(Repayments of) proceeds from book overdrafts	0	0
Payments of capital lease obligations	0	0
Proceeds from stock option exercises and other share-based awards	0	0
Excess tax benefit from stock-based compensation	0	0
Payments for debt extinguishment, call premiums	0
Payments of financing costs	0	0
Net financing activities and advances (to) from consolidated affiliates	0	0
Net cash provided by (used in) financing activities	0	0
Net increase (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