Supplemental Guarantor Condensed Unaudited Consolidating Financial Information (Condensed Unaudited Consolidating Statements Of Operations and Comprehensive Income) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	$ 964,029,000	$ 918,648,000
Costs of revenue, excluding depreciation and amortization	841,054,000	791,499,000
Depreciation and amortization	33,494,000	31,753,000
General and administrative expenses	53,327,000	48,885,000
Interest expense, net	12,003,000	10,045,000
Loss on extinguishment of debt	0	5,624,000
Other (income) expense, net	(1,955,000)	(826,000)
Income from continuing operations before income taxes	26,106,000	31,668,000
Benefit from (provision for) income taxes	(9,916,000)	(12,348,000)
Net income from continuing operations	16,190,000	19,320,000
Net loss from discontinued operations	(122,000)	(947,000)
Equity in income from subsidiaries, net of tax	0	0
Net income	16,068,000	18,373,000
Net income attributable to non-controlling interests	45,000	3,000
Net income attributable to MasTec, Inc.	16,023,000	18,370,000
Comprehensive income (loss)	10,733,000	17,770,000
Eliminations [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	0	(1,700,000)
Costs of revenue, excluding depreciation and amortization	0	(1,700,000)
Depreciation and amortization	0	0
General and administrative expenses	0	0
Interest expense, net	0	0
Loss on extinguishment of debt		0
Other (income) expense, net	0	0
Income from continuing operations before income taxes	0	0
Benefit from (provision for) income taxes	0	0
Net income from continuing operations	0	0
Net loss from discontinued operations	0	0
Equity in income from subsidiaries, net of tax	(16,400,000)	(18,800,000)
Net income	(16,400,000)	(18,800,000)
Net income attributable to non-controlling interests	0	0
Net income attributable to MasTec, Inc.	(16,400,000)	(18,800,000)
Comprehensive income (loss)	(11,000,000)	(18,000,000)
MasTec, Inc. [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	0	0
Costs of revenue, excluding depreciation and amortization	0	0
Depreciation and amortization	0	0
General and administrative expenses	600,000	300,000
Interest expense, net	0	0
Loss on extinguishment of debt		0
Other (income) expense, net	0	0
Income from continuing operations before income taxes	(600,000)	(300,000)
Benefit from (provision for) income taxes	200,000	100,000
Net income from continuing operations	(400,000)	(200,000)
Net loss from discontinued operations	0	0
Equity in income from subsidiaries, net of tax	16,400,000	18,800,000
Net income	16,000,000	18,600,000
Net income attributable to non-controlling interests	0	0
Net income attributable to MasTec, Inc.	16,000,000	18,600,000
Comprehensive income (loss)	10,600,000	17,800,000
Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	793,100,000	843,100,000
Costs of revenue, excluding depreciation and amortization	689,800,000	721,200,000
Depreciation and amortization	27,400,000	28,900,000
General and administrative expenses	47,300,000	45,100,000
Interest expense, net	11,700,000	10,000,000
Loss on extinguishment of debt		5,600,000
Other (income) expense, net	(2,100,000)	(900,000)
Income from continuing operations before income taxes	19,000,000	33,200,000
Benefit from (provision for) income taxes	(9,400,000)	(13,000,000)
Net income from continuing operations	9,600,000	20,200,000
Net loss from discontinued operations	0	0
Equity in income from subsidiaries, net of tax	0	0
Net income	9,600,000	20,200,000
Net income attributable to non-controlling interests	0	0
Net income attributable to MasTec, Inc.	9,600,000	20,200,000
Comprehensive income (loss)	9,500,000	20,500,000
Non-Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	170,900,000	77,200,000
Costs of revenue, excluding depreciation and amortization	151,300,000	72,000,000
Depreciation and amortization	6,100,000	2,900,000
General and administrative expenses	5,400,000	3,500,000
Interest expense, net	300,000	0
Loss on extinguishment of debt		0
Other (income) expense, net	100,000	0
Income from continuing operations before income taxes	7,700,000	(1,200,000)
Benefit from (provision for) income taxes	(700,000)	500,000
Net income from continuing operations	7,000,000	(700,000)
Net loss from discontinued operations	(100,000)	(900,000)
Equity in income from subsidiaries, net of tax	0	0
Net income	6,900,000	(1,600,000)
Net income attributable to non-controlling interests	100,000	0
Net income attributable to MasTec, Inc.	6,800,000	(1,600,000)
Comprehensive income (loss)	$ 1,600,000	$ (2,500,000)