Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Statements Of Operations And Comprehensive Income) (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Income Statements, Captions [Line Items]
Revenue	$ 1,269,385,000	$ 1,067,300,000	$ 3,165,657,000	$ 2,794,431,000
Costs of revenue, excluding depreciation and amortization	1,081,132,000	924,304,000	2,695,287,000	2,445,056,000
Depreciation and amortization			103,111,000	65,767,000
General and administrative expenses	58,976,000	42,514,000	159,761,000	118,192,000
Interest expense, net	12,666,000	9,446,000	34,549,000	27,883,000
Loss on extinguishment of debt	0	0	5,624,000	0
Other (income) expense, net	(2,778,000)	8,815,000	(3,283,000)	7,989,000
Income from continuing operations before provision for income taxes	81,633,000	59,576,000	170,608,000	130,186,000
(Benefit from) provision for income taxes	(31,698,000)	(23,478,000)	(65,822,000)	(51,229,000)
Net income from continuing operations before non-controlling interests	49,935,000	36,098,000	104,786,000	78,957,000
Loss from discontinued operations, net of tax	(3,735,000)	(9,281,000)	(5,165,000)	(7,881,000)
Equity in income from subsidiaries, net of tax	0	0	0	0
Net income	46,200,000	26,817,000	99,621,000	71,076,000
Net income (loss) attributable to non-controlling interests	62,000	(4,000)	172,000	(9,000)
Net income attributable to MasTec, Inc.	46,138,000	26,821,000	99,449,000	71,085,000
Comprehensive income (loss)	49,044,000	29,381,000	95,224,000	73,719,000
Continuing Operations [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	1,269,400,000	1,067,300,000	3,165,700,000	2,794,400,000
Depreciation and amortization	37,756,000	22,645,000	103,111,000	65,125,000
Interest expense, net	12,700,000	9,400,000	34,500,000	27,900,000
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	(4,367,000)	(1,013,000)	(10,367,000)	(2,033,000)
Costs of revenue, excluding depreciation and amortization	(4,367,000)	(1,013,000)	(10,367,000)	(2,033,000)
General and administrative expenses	0	0	0	0
Interest expense, net	0	0	0	0
Loss on extinguishment of debt			0
Other (income) expense, net	0	0	0	0
Income from continuing operations before provision for income taxes	0	0	0	0
(Benefit from) provision for income taxes	0	0	0	0
Net income from continuing operations before non-controlling interests	0	0	0	0
Loss from discontinued operations, net of tax	0	0	0	0
Equity in income from subsidiaries, net of tax	(46,484,000)	(27,006,000)	(100,494,000)	(71,706,000)
Net income	(46,484,000)	(27,006,000)	(100,494,000)	(71,706,000)
Net income (loss) attributable to non-controlling interests	0	0	0	0
Net income attributable to MasTec, Inc.	(46,484,000)	(27,006,000)	(100,494,000)	(71,706,000)
Comprehensive income (loss)	(46,484,000)	(27,006,000)	(100,494,000)	(71,706,000)
Consolidation, Eliminations [Member] | Continuing Operations [Member]
Condensed Income Statements, Captions [Line Items]
Depreciation and amortization	0	0	0	0
MasTec, Inc. [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	0	0	0	0
Costs of revenue, excluding depreciation and amortization	0	0	0	0
General and administrative expenses	457,000	303,000	1,443,000	1,052,000
Interest expense, net	0	0	0	0
Loss on extinguishment of debt			0
Other (income) expense, net	0	0	0	0
Income from continuing operations before provision for income taxes	(458,000)	(303,000)	(1,445,000)	(1,053,000)
(Benefit from) provision for income taxes	174,000	114,000	572,000	423,000
Net income from continuing operations before non-controlling interests	(284,000)	(189,000)	(873,000)	(630,000)
Loss from discontinued operations, net of tax	0	0	0	0
Equity in income from subsidiaries, net of tax	46,484,000	27,006,000	100,494,000	71,706,000
Net income	46,200,000	26,817,000	99,621,000	71,076,000
Net income (loss) attributable to non-controlling interests	0	0	0	0
Net income attributable to MasTec, Inc.	46,200,000	26,817,000	99,621,000	71,076,000
Comprehensive income (loss)	46,200,000	26,817,000	99,621,000	71,076,000
MasTec, Inc. [Member] | Continuing Operations [Member]
Condensed Income Statements, Captions [Line Items]
Depreciation and amortization	1,000	0	2,000	1,000
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	1,086,063,000	1,028,091,000	2,751,408,000	2,644,197,000
Costs of revenue, excluding depreciation and amortization	927,295,000	886,198,000	2,348,835,000	2,312,564,000
General and administrative expenses	47,967,000	39,251,000	134,460,000	109,366,000
Interest expense, net	11,951,000	9,435,000	33,583,000	27,880,000
Loss on extinguishment of debt			5,624,000
Other (income) expense, net	(2,309,000)	8,696,000	(2,526,000)	7,655,000
Income from continuing operations before provision for income taxes	70,522,000	62,446,000	144,006,000	123,329,000
(Benefit from) provision for income taxes	(28,840,000)	(24,564,000)	(56,782,000)	(49,766,000)
Net income from continuing operations before non-controlling interests	41,682,000	37,882,000	87,224,000	73,563,000
Loss from discontinued operations, net of tax	(3,566,000)	(8,852,000)	(4,178,000)	(6,099,000)
Equity in income from subsidiaries, net of tax	0	0	0	0
Net income	38,116,000	29,030,000	83,046,000	67,464,000
Net income (loss) attributable to non-controlling interests	87,000	0	87,000	0
Net income attributable to MasTec, Inc.	38,029,000	29,030,000	82,959,000	67,464,000
Comprehensive income (loss)	38,024,000	29,418,000	82,489,000	67,803,000
Guarantor Subsidiaries [Member] | Continuing Operations [Member]
Condensed Income Statements, Captions [Line Items]
Depreciation and amortization	30,637,000	22,065,000	87,426,000	63,403,000
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	187,689,000	40,222,000	424,616,000	152,267,000
Costs of revenue, excluding depreciation and amortization	158,204,000	39,119,000	356,819,000	134,525,000
General and administrative expenses	10,552,000	2,960,000	23,858,000	7,774,000
Interest expense, net	715,000	11,000	966,000	3,000
Loss on extinguishment of debt			0
Other (income) expense, net	(469,000)	119,000	(757,000)	334,000
Income from continuing operations before provision for income taxes	11,569,000	(2,567,000)	28,047,000	7,910,000
(Benefit from) provision for income taxes	(3,032,000)	972,000	(9,612,000)	(1,886,000)
Net income from continuing operations before non-controlling interests	8,537,000	(1,595,000)	18,435,000	6,024,000
Loss from discontinued operations, net of tax	(169,000)	(429,000)	(987,000)	(1,782,000)
Equity in income from subsidiaries, net of tax	0	0	0	0
Net income	8,368,000	(2,024,000)	17,448,000	4,242,000
Net income (loss) attributable to non-controlling interests	(25,000)	(4,000)	85,000	(9,000)
Net income attributable to MasTec, Inc.	8,393,000	(2,020,000)	17,363,000	4,251,000
Comprehensive income (loss)	11,304,000	152,000	13,608,000	6,546,000
Non-Guarantor Subsidiaries [Member] | Continuing Operations [Member]
Condensed Income Statements, Captions [Line Items]
Depreciation and amortization	$ 7,118,000	$ 580,000	$ 15,683,000	$ 1,721,000