Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	$ 1,003,268	$ 957,818
Costs of revenue, excluding depreciation and amortization	886,414	841,324
Depreciation and amortization	42,598	33,494
General and administrative expenses	74,030	53,327
Interest expense (income), net	10,973	12,003
Other (income) expense, net	(7)	(2,083)
(Loss) income from continuing operations before income taxes	(10,740)	19,753
Benefit from (provision for) income taxes	4,352	(7,489)
Net (loss) income from continuing operations	(6,388)	12,264
Net loss from discontinued operations	0	(122)
Equity in (loss) income from subsidiaries, net of tax	0	0
Net (loss) income	(6,388)	12,142
Net (loss) income attributable to non-controlling interests	(125)	45
Net (loss) income attributable to MasTec, Inc.	(6,263)	12,097
Comprehensive (loss) income	(28,416)	6,806
Reportable Legal Entities [Member] | 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	600
Interest expense (income), net	0	0
Other (income) expense, net	0	0
(Loss) income from continuing operations before income taxes	(600)	(600)
Benefit from (provision for) income taxes	200	300
Net (loss) income from continuing operations	(400)	(300)
Net loss from discontinued operations		0
Equity in (loss) income from subsidiaries, net of tax	(5,900)	12,300
Net (loss) income	(6,300)	12,000
Net (loss) income attributable to non-controlling interests	0	0
Net (loss) income attributable to MasTec, Inc.	(6,300)	12,000
Comprehensive (loss) income	(28,300)	6,800
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	803,000	791,000
Costs of revenue, excluding depreciation and amortization	682,700	693,200
Depreciation and amortization	32,300	28,100
General and administrative expenses	66,200	47,700
Interest expense (income), net	27,100	11,800
Other (income) expense, net	(900)	(2,200)
(Loss) income from continuing operations before income taxes	(4,400)	12,400
Benefit from (provision for) income taxes	1,700	(7,000)
Net (loss) income from continuing operations	(2,700)	5,400
Net loss from discontinued operations		0
Equity in (loss) income from subsidiaries, net of tax	0	0
Net (loss) income	(2,700)	5,400
Net (loss) income attributable to non-controlling interests	0	0
Net (loss) income attributable to MasTec, Inc.	(2,700)	5,400
Comprehensive (loss) income	(2,700)	5,400
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	201,700	166,800
Costs of revenue, excluding depreciation and amortization	205,100	148,100
Depreciation and amortization	10,300	5,400
General and administrative expenses	7,200	5,000
Interest expense (income), net	(16,100)	200
Other (income) expense, net	900	100
(Loss) income from continuing operations before income taxes	(5,700)	8,000
Benefit from (provision for) income taxes	2,400	(800)
Net (loss) income from continuing operations	(3,300)	7,200
Net loss from discontinued operations		(200)
Equity in (loss) income from subsidiaries, net of tax	0	0
Net (loss) income	(3,300)	7,000
Net (loss) income attributable to non-controlling interests	(100)	0
Net (loss) income attributable to MasTec, Inc.	(3,200)	7,000
Comprehensive (loss) income	(25,400)	1,600
Eliminations [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income [Line Items]
Revenue	(1,400)	0
Costs of revenue, excluding depreciation and amortization	(1,400)	0
Depreciation and amortization	0	0
General and administrative expenses	0	0
Interest expense (income), net	0	0
Other (income) expense, net	0	0
(Loss) income from continuing operations before income taxes	0	0
Benefit from (provision for) income taxes	0	0
Net (loss) income from continuing operations	0	0
Net loss from discontinued operations		0
Equity in (loss) income from subsidiaries, net of tax	5,900	(12,300)
Net (loss) income	5,900	(12,300)
Net (loss) income attributable to non-controlling interests	0	0
Net (loss) income attributable to MasTec, Inc.	5,900	(12,300)
Comprehensive (loss) income	$ 28,000	$ (7,000)