Supplemental Guarantor Condensed Unaudited Consolidating Financial Information (Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	$ 1,309,596,000	$ 1,269,385,000	$ 3,378,180,000	$ 3,165,657,000
Costs of revenue, excluding depreciation and amortization	1,122,961,000	1,081,132,000	2,914,904,000	2,695,287,000
Depreciation and amortization	41,747,000	37,756,000	111,996,000	103,111,000
General and administrative expenses	59,889,000	58,976,000	167,454,000	159,761,000
Interest expense, net	12,643,000	12,666,000	37,595,000	34,549,000
Loss on extinguishment of debt	0	0	0	5,624,000
Other (income) expense, net	(1,416,000)	(2,778,000)	(5,424,000)	(3,283,000)
Income from continuing operations before income taxes	73,772,000	81,633,000	151,655,000	170,608,000
Benefit from (provision for) income taxes	(28,042,000)	(31,698,000)	(57,671,000)	(65,822,000)
Net income from continuing operations	45,730,000	49,935,000	93,984,000	104,786,000
Net loss from discontinued operations	(320,000)	(3,735,000)	(592,000)	(5,165,000)
Equity in income from subsidiaries, net of tax	0	0	0	0
Net income	45,410,000	46,200,000	93,392,000	99,621,000
Net income attributable to non-controlling interests	139,000	62,000	48,000	172,000
Net income attributable to MasTec, Inc.	45,271,000	46,138,000	93,344,000	99,449,000
Comprehensive income (loss)	32,466,000	49,044,000	82,791,000	95,224,000
Eliminations [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	(2,000,000)	(500,000)	(2,100,000)	(4,400,000)
Costs of revenue, excluding depreciation and amortization	(2,000,000)	(500,000)	(2,100,000)	(4,400,000)
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	(45,700,000)	(46,400,000)	(94,500,000)	(100,300,000)
Net income	(45,700,000)	(46,400,000)	(94,500,000)	(100,300,000)
Net income attributable to non-controlling interests	0	0	0	0
Net income attributable to MasTec, Inc.	(45,700,000)	(46,400,000)	(94,500,000)	(100,300,000)
Comprehensive income (loss)	(32,700,000)	(49,300,000)	(83,900,000)	(95,900,000)
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	600,000	500,000	1,800,000	1,400,000
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	(600,000)	(500,000)	(1,800,000)	(1,400,000)
Benefit from (provision for) income taxes	200,000	200,000	700,000	600,000
Net income from continuing operations	(400,000)	(300,000)	(1,100,000)	(800,000)
Net loss from discontinued operations	0	0	0	0
Equity in income from subsidiaries, net of tax	45,700,000	46,400,000	94,500,000	100,300,000
Net income	45,300,000	46,100,000	93,400,000	99,500,000
Net income attributable to non-controlling interests	0	0	0	0
Net income attributable to MasTec, Inc.	45,300,000	46,100,000	93,400,000	99,500,000
Comprehensive income (loss)	32,300,000	49,000,000	82,800,000	95,100,000
Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	1,043,100,000	1,140,900,000	2,798,600,000	2,881,100,000
Costs of revenue, excluding depreciation and amortization	892,600,000	969,500,000	2,402,000,000	2,447,700,000
Depreciation and amortization	30,800,000	31,600,000	88,400,000	88,800,000
General and administrative expenses	50,800,000	50,100,000	146,600,000	138,500,000
Interest expense, net	11,500,000	12,000,000	35,600,000	33,500,000
Loss on extinguishment of debt				5,600,000
Other (income) expense, net	(1,600,000)	(2,300,000)	(5,800,000)	(2,400,000)
Income from continuing operations before income taxes	59,000,000	80,000,000	131,800,000	169,400,000
Benefit from (provision for) income taxes	(22,000,000)	(31,500,000)	(51,200,000)	(66,000,000)
Net income from continuing operations	37,000,000	48,500,000	80,600,000	103,400,000
Net loss from discontinued operations	0	0	0	0
Equity in income from subsidiaries, net of tax	0	0	0	0
Net income	37,000,000	48,500,000	80,600,000	103,400,000
Net income attributable to non-controlling interests	0	0	0	0
Net income attributable to MasTec, Inc.	37,000,000	48,500,000	80,600,000	103,400,000
Comprehensive income (loss)	37,000,000	48,500,000	80,500,000	102,800,000
Non-Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	268,500,000	129,000,000	581,700,000	289,000,000
Costs of revenue, excluding depreciation and amortization	232,400,000	112,100,000	515,000,000	252,000,000
Depreciation and amortization	10,900,000	6,200,000	23,600,000	14,300,000
General and administrative expenses	8,500,000	8,400,000	19,100,000	19,900,000
Interest expense, net	1,100,000	700,000	2,000,000	1,000,000
Loss on extinguishment of debt				0
Other (income) expense, net	200,000	(500,000)	300,000	(800,000)
Income from continuing operations before income taxes	15,400,000	2,100,000	21,700,000	2,600,000
Benefit from (provision for) income taxes	(6,200,000)	(400,000)	(7,200,000)	(400,000)
Net income from continuing operations	9,200,000	1,700,000	14,500,000	2,200,000
Net loss from discontinued operations	(300,000)	(3,700,000)	(600,000)	(5,200,000)
Equity in income from subsidiaries, net of tax	0	0	0	0
Net income	8,900,000	(2,000,000)	13,900,000	(3,000,000)
Net income attributable to non-controlling interests	100,000	100,000	0	200,000
Net income attributable to MasTec, Inc.	8,800,000	(2,100,000)	13,800,000	(3,200,000)
Comprehensive income (loss)	$ (4,100,000)	$ 800,000	$ 3,400,000	$ (6,800,000)