Supplemental Guarantor Condensed Unaudited Consolidating Financial Information (Condensed Unaudited Consolidating Statements Of Operations and Comprehensive Income) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	$ 1,104,556,000	$ 977,624,000	$ 2,068,585,000	$ 1,896,272,000
Costs of revenue, excluding depreciation and amortization	950,889,000	822,655,000	1,791,943,000	1,614,154,000
Depreciation and amortization	36,755,000	33,602,000	70,249,000	65,355,000
General and administrative expenses	54,237,000	51,900,000	107,564,000	100,785,000
Interest expense, net	12,949,000	11,838,000	24,952,000	21,883,000
Loss on extinguishment of debt	0	0	0	5,624,000
Other (income) expense, net	(2,051,000)	322,000	(4,007,000)	(504,000)
Income from continuing operations before income taxes	51,777,000	57,307,000	77,884,000	88,975,000
Benefit from (provision for) income taxes	(19,714,000)	(21,776,000)	(29,630,000)	(34,124,000)
Net income from continuing operations	32,063,000	35,531,000	48,254,000	54,851,000
Net loss from discontinued operations	(149,000)	(484,000)	(272,000)	(1,431,000)
Equity in income from subsidiaries, net of tax	0	0	0	0
Net income	31,914,000	35,047,000	47,982,000	53,420,000
Net (loss) income attributable to non-controlling interests	(136,000)	106,000	(91,000)	109,000
Net income attributable to MasTec, Inc.	32,050,000	34,941,000	48,073,000	53,311,000
Comprehensive income (loss)	39,592,000	28,408,000	50,325,000	46,179,000
Eliminations [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	(100,000)	(2,300,000)	(100,000)	(4,000,000)
Costs of revenue, excluding depreciation and amortization	(100,000)	(2,300,000)	(100,000)	(4,000,000)
Depreciation and amortization	0	0	0	0
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 income taxes	0	0	0	0
Benefit from (provision for) income taxes	0	0	0	0
Net income from continuing operations	0	0	0	0
Net loss from discontinued operations	0	0	0	0
Equity in income from subsidiaries, net of tax	(32,500,000)	(35,300,000)	(48,800,000)	(53,900,000)
Net income	(32,500,000)	(35,300,000)	(48,800,000)	(53,900,000)
Net (loss) income attributable to non-controlling interests	0	0	0	0
Net income attributable to MasTec, Inc.	(32,500,000)	(35,300,000)	(48,800,000)	(53,900,000)
Comprehensive income (loss)	(40,100,000)	(28,700,000)	(51,200,000)	(46,700,000)
MasTec, Inc. [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	0	0	0	0
Costs of revenue, excluding depreciation and amortization	0	0	0	0
Depreciation and amortization	0	0	0	0
General and administrative expenses	700,000	700,000	1,200,000	1,000,000
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 income taxes	(700,000)	(700,000)	(1,200,000)	(1,000,000)
Benefit from (provision for) income taxes	300,000	300,000	500,000	400,000
Net income from continuing operations	(400,000)	(400,000)	(700,000)	(600,000)
Net loss from discontinued operations	0	0	0	0
Equity in income from subsidiaries, net of tax	32,500,000	35,300,000	48,800,000	53,900,000
Net income	32,100,000	34,900,000	48,100,000	53,300,000
Net (loss) income attributable to non-controlling interests	0	0	0	0
Net income attributable to MasTec, Inc.	32,100,000	34,900,000	48,100,000	53,300,000
Comprehensive income (loss)	39,700,000	28,300,000	50,500,000	46,100,000
Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	958,300,000	897,000,000	1,755,400,000	1,740,200,000
Costs of revenue, excluding depreciation and amortization	816,200,000	757,100,000	1,509,400,000	1,478,200,000
Depreciation and amortization	29,400,000	28,400,000	57,400,000	57,300,000
General and administrative expenses	48,000,000	43,300,000	95,900,000	88,400,000
Interest expense, net	12,300,000	11,600,000	24,100,000	21,600,000
Loss on extinguishment of debt				5,600,000
Other (income) expense, net	(2,000,000)	600,000	(4,100,000)	(200,000)
Income from continuing operations before income taxes	54,400,000	56,000,000	72,700,000	89,300,000
Benefit from (provision for) income taxes	(20,500,000)	(21,500,000)	(29,200,000)	(34,400,000)
Net income from continuing operations	33,900,000	34,500,000	43,500,000	54,900,000
Net loss from discontinued operations	0	0	0	0
Equity in income from subsidiaries, net of tax	0	0	0	0
Net income	33,900,000	34,500,000	43,500,000	54,900,000
Net (loss) income attributable to non-controlling interests	0	0	0	0
Net income attributable to MasTec, Inc.	33,900,000	34,500,000	43,500,000	54,900,000
Comprehensive income (loss)	33,900,000	33,900,000	43,500,000	54,400,000
Non-Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	146,400,000	82,900,000	313,300,000	160,100,000
Costs of revenue, excluding depreciation and amortization	134,800,000	67,900,000	282,600,000	140,000,000
Depreciation and amortization	7,400,000	5,200,000	12,800,000	8,100,000
General and administrative expenses	5,500,000	7,900,000	10,500,000	11,400,000
Interest expense, net	600,000	200,000	900,000	300,000
Loss on extinguishment of debt				0
Other (income) expense, net	0	(300,000)	100,000	(400,000)
Income from continuing operations before income taxes	(1,900,000)	2,000,000	6,400,000	700,000
Benefit from (provision for) income taxes	500,000	(600,000)	(900,000)	(100,000)
Net income from continuing operations	(1,400,000)	1,400,000	5,500,000	600,000
Net loss from discontinued operations	(100,000)	(500,000)	(300,000)	(1,400,000)
Equity in income from subsidiaries, net of tax	0	0	0	0
Net income	(1,600,000)	900,000	5,200,000	(800,000)
Net (loss) income attributable to non-controlling interests	(200,000)	100,000	(100,000)	100,000
Net income attributable to MasTec, Inc.	(1,400,000)	800,000	5,300,000	(900,000)
Comprehensive income (loss)	$ 6,100,000	$ (5,100,000)	$ 7,500,000	$ (7,600,000)