Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Statements Of Operations And Comprehensive Income) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenue	$ 1,067,300	$ 816,226	$ 2,794,431	$ 2,099,674
Costs of revenue, excluding depreciation and amortization	924,304	702,969	2,445,056	1,805,997
Depreciation and amortization	22,645	19,587	65,125	52,769
General and administrative expenses	42,514	35,174	118,192	97,739
Interest expense, net	9,446	8,977	27,883	25,202
Gain on remeasurement of equity interest in acquiree	0	0	0	(29,041)
Other expense (income), net	8,815	650	7,989	160
Income from continuing operations before provision for income taxes	59,576	48,869	130,186	146,848
Benefit (provision) for income taxes	(23,478)	(18,042)	(51,229)	(56,374)
Income from continuing operations before non-controlling interests	36,098	30,827	78,957	90,474
Income (loss) from discontinued operations, net of tax	(9,281)	1,003	(7,881)	6,937
Equity in income from subsidiaries, net of tax			0	0
Net income	26,817	31,830	71,076	97,411
Net loss attributable to non-controlling interests	(4)	(12)	(9)	(31)
Net income attributable to MasTec, Inc.	26,821	31,842	71,085	97,442
Comprehensive income (loss)	29,381	28,529	73,719	94,167
Parent Company [Member]
Revenue			0	0
Costs of revenue, excluding depreciation and amortization			0	0
Depreciation and amortization			1	0
General and administrative expenses			1,052	1,754
Interest expense, net			0	0
Gain on remeasurement of equity interest in acquiree				0
Other expense (income), net			0	0
Income from continuing operations before provision for income taxes			(1,053)	(1,754)
Benefit (provision) for income taxes			423	684
Income from continuing operations before non-controlling interests			(630)	(1,070)
Income (loss) from discontinued operations, net of tax			0	0
Equity in income from subsidiaries, net of tax			71,706	98,481
Net income			71,076	97,411
Net loss attributable to non-controlling interests			0	0
Net income attributable to MasTec, Inc.			71,076	97,411
Comprehensive income (loss)			71,415	97,227
Guarantor Subsidiaries [Member]
Revenue			2,644,197	2,036,180
Costs of revenue, excluding depreciation and amortization			2,312,564	1,753,352
Depreciation and amortization			63,403	51,317
General and administrative expenses			109,454	92,918
Interest expense, net			27,880	25,077
Gain on remeasurement of equity interest in acquiree				(29,041)
Other expense (income), net			7,775	441
Income from continuing operations before provision for income taxes			123,121	142,116
Benefit (provision) for income taxes			(49,766)	(55,378)
Income from continuing operations before non-controlling interests			73,355	86,738
Income (loss) from discontinued operations, net of tax			(6,086)	8,682
Equity in income from subsidiaries, net of tax			0	0
Net income			67,269	95,420
Net loss attributable to non-controlling interests			0	0
Net income attributable to MasTec, Inc.			67,269	95,420
Comprehensive income (loss)			67,269	95,420
Non-Guarantor Subsidiaries [Member]
Revenue			152,267	63,494
Costs of revenue, excluding depreciation and amortization			134,525	52,645
Depreciation and amortization			1,721	1,452
General and administrative expenses			7,686	3,067
Interest expense, net			3	125
Gain on remeasurement of equity interest in acquiree				0
Other expense (income), net			214	(281)
Income from continuing operations before provision for income taxes			8,118	6,486
Benefit (provision) for income taxes			(1,886)	(1,680)
Income from continuing operations before non-controlling interests			6,232	4,806
Income (loss) from discontinued operations, net of tax			(1,795)	(1,745)
Equity in income from subsidiaries, net of tax			0	0
Net income			4,437	3,061
Net loss attributable to non-controlling interests			(9)	(31)
Net income attributable to MasTec, Inc.			4,446	3,092
Comprehensive income (loss)			6,741	1
Consolidation, Eliminations [Member]
Revenue			(2,033)	0
Costs of revenue, excluding depreciation and amortization			(2,033)	0
Depreciation and amortization			0	0
General and administrative expenses			0	0
Interest expense, net			0	0
Gain on remeasurement of equity interest in acquiree				0
Other expense (income), net			0	0
Income from continuing operations before provision for income taxes			0	0
Benefit (provision) for income taxes			0	0
Income from continuing operations before non-controlling interests			0	0
Income (loss) from discontinued operations, net of tax			0	0
Equity in income from subsidiaries, net of tax			(71,706)	(98,481)
Net income			(71,706)	(98,481)
Net loss attributable to non-controlling interests			0	0
Net income attributable to MasTec, Inc.			(71,706)	(98,481)
Comprehensive income (loss)			$ (71,706)	$ (98,481)