Supplemental Guarantor Financial Information (Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended											12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	[1]	Jun. 30, 2014	[1]	Mar. 31, 2014	[1]	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items]
Revenue	$ 1,027,400	$ 1,111,000	$ 1,066,600	$ 1,003,300	$ 1,231,300	$ 1,315,500		$ 1,107,200		$ 957,800		$ 4,208,330	$ 4,611,803	$ 4,324,787
Costs of revenue, excluding depreciation and amortization	916,300	972,700	945,900	886,400	1,063,100	1,122,900		950,700		841,300		3,721,303	3,977,963	3,682,367
Depreciation and amortization												169,662	154,452	140,926
Goodwill and intangible asset impairment												78,625	0	0
General and administrative expenses												265,910	238,305	215,402
Interest expense, net												48,055	50,769	46,442
Loss on extinguishment of debt												0	0	5,624
Other income, net												(7,479)	(8,116)	(6,188)
(Loss) income from continuing operations before income taxes												(67,746)	198,430	240,214
Benefit from (provision for) income taxes												(11,957)	(76,429)	(92,542)
Net (loss) income from continuing operations	(76,900)	7,400	(3,800)	(6,400)	26,600	49,400		33,700		12,300		(79,703)	122,001	147,672
Net loss from discontinued operations												0	(6,452)	(6,456)
Equity in income from subsidiaries, net of tax												0	0	0
Net (loss) income												(79,703)	115,549	141,216
Net (loss) income attributable to non-controlling interests												(593)	(374)	266
Net (loss) income attributable to MasTec, Inc.	$ (76,700)	$ 7,600	$ (3,700)	$ (6,300)	$ 21,100	$ 49,000		$ 33,700		$ 12,100		(79,110)	115,923	140,950
Comprehensive (loss) income												(118,050)	94,831	133,431
Reportable Legal Entities [Member] | MasTec, Inc. [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items]
Revenue												0	0	0
Costs of revenue, excluding depreciation and amortization												0	0	0
Depreciation and amortization												0	0	0
Goodwill and intangible asset impairment												0
General and administrative expenses												2,100	2,500	2,100
Interest expense, net												0	0	0
Loss on extinguishment of debt														0
Other income, net												0	0	0
(Loss) income from continuing operations before income taxes												(2,100)	(2,500)	(2,100)
Benefit from (provision for) income taxes												1,100	1,000	800
Net (loss) income from continuing operations												(1,000)	(1,500)	(1,300)
Net loss from discontinued operations												0	0	0
Equity in income from subsidiaries, net of tax												(78,100)	117,400	142,200
Net (loss) income												(79,100)	115,900	140,900
Net (loss) income attributable to non-controlling interests												0	0	0
Net (loss) income attributable to MasTec, Inc.												(79,100)	115,900	140,900
Comprehensive (loss) income												(117,500)	95,200	133,100
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items]
Revenue												3,527,000	3,768,400	3,903,800
Costs of revenue, excluding depreciation and amortization												3,073,600	3,226,200	3,321,300
Depreciation and amortization												130,600	119,300	120,100
Goodwill and intangible asset impairment												0
General and administrative expenses												235,400	208,500	184,600
Interest expense, net												42,800	47,800	45,500
Loss on extinguishment of debt														5,600
Other income, net												(6,200)	(1,900)	(6,100)
(Loss) income from continuing operations before income taxes												50,800	168,500	232,800
Benefit from (provision for) income taxes												(27,100)	(70,600)	(91,900)
Net (loss) income from continuing operations												23,700	97,900	140,900
Net loss from discontinued operations												0	0	0
Equity in income from subsidiaries, net of tax												0	0	0
Net (loss) income												23,700	97,900	140,900
Net (loss) income attributable to non-controlling interests												0	0	0
Net (loss) income attributable to MasTec, Inc.												23,700	97,900	140,900
Comprehensive (loss) income												23,700	97,900	140,900
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items]
Revenue												689,700	847,700	425,600
Costs of revenue, excluding depreciation and amortization												656,100	756,100	365,700
Depreciation and amortization												39,000	35,200	20,800
Goodwill and intangible asset impairment												78,600
General and administrative expenses												28,400	27,300	28,700
Interest expense, net												5,300	3,000	900
Loss on extinguishment of debt														0
Other income, net												(1,300)	(6,300)	0
(Loss) income from continuing operations before income taxes												(116,400)	32,400	9,500
Benefit from (provision for) income taxes												14,100	(6,800)	(1,400)
Net (loss) income from continuing operations												(102,300)	25,600	8,100
Net loss from discontinued operations												0	(6,500)	(6,500)
Equity in income from subsidiaries, net of tax												0	0	0
Net (loss) income												(102,300)	19,100	1,600
Net (loss) income attributable to non-controlling interests												(600)	(400)	300
Net (loss) income attributable to MasTec, Inc.												(101,700)	19,500	1,300
Comprehensive (loss) income												(140,700)	(1,600)	(6,200)
Eliminations [Member]
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items]
Revenue												(8,400)	(4,300)	(4,600)
Costs of revenue, excluding depreciation and amortization												(8,400)	(4,300)	(4,600)
Depreciation and amortization												0	0	0
Goodwill and intangible asset impairment												0
General and administrative expenses												0	0	0
Interest expense, net												0	0	0
Loss on extinguishment of debt														0
Other income, net												0	0	0
(Loss) income from continuing operations before income taxes												0	0	0
Benefit from (provision for) income taxes												0	0	0
Net (loss) income from continuing operations												0	0	0
Net loss from discontinued operations												0	0	0
Equity in income from subsidiaries, net of tax												78,100	(117,400)	(142,200)
Net (loss) income												78,100	(117,400)	(142,200)
Net (loss) income attributable to non-controlling interests												0	0	0
Net (loss) income attributable to MasTec, Inc.												78,100	(117,400)	(142,200)
Comprehensive (loss) income												$ 116,500	$ (96,700)	$ (134,400)

[1] Reflects restated data as previously presented in the Company’s 2014 10-K. See Independent Investigation of the Audit Committee and Related Restatements in Note 1 - Business, Basis of Presentation and Significant Accounting Policies.