Condensed Unaudited Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Total MasTec, Inc. Shareholders' Equity [Member]	Non-Controlling Interests [Member]
Condensed Unaudited Consolidated Statements of Equity
Cumulative effect of adoption, Topic 606	$ 1,563				$ 1,563		$ 1,563
Beginning balance, common shares outstanding (in shares) at Dec. 31, 2017		90,935,584
Beginning balance at Dec. 31, 2017	1,433,353	$ 9,094	$ (147,124)	$ 775,387	857,154	$ (63,712)	1,430,799	$ 2,554
Beginning balance, treasury shares (in shares) at Dec. 31, 2017			(8,132,811)
Condensed Unaudited Consolidated Statements of Equity
Net income (loss)	26,463				26,560		26,560	(97)
Other comprehensive (loss) income	7,193					7,193	7,193
Non-cash stock-based compensation	3,182			3,182			3,182
Issuance of restricted shares, net (in shares)		104,815
Issuance of restricted shares, net	0	$ 10		(10)			0
Other stock issuances, net of shares withheld for taxes (in shares)		23,300
Other stock issuances, net of shares withheld for taxes	892	$ 2		890			892
Acquisition of treasury stock, at cost (in shares)			(2,038,720)
Acquisition of treasury stock, at cost	(98,449)		$ (98,449)				(98,449)
Ending balance, common shares outstanding (in shares) at Mar. 31, 2018		91,063,699
Ending balance at Mar. 31, 2018	$ 1,374,197	$ 9,106	$ (245,573)	779,449	885,277	(56,519)	1,371,740	2,457
Ending balance, treasury shares (in shares) at Mar. 31, 2018			(10,171,531)
Beginning balance, common shares outstanding (in shares) at Dec. 31, 2018	91,327,009	91,327,009
Beginning balance at Dec. 31, 2018	$ 1,392,024	$ 9,133	$ (466,125)	789,009	1,118,375	(60,494)	1,389,898	2,126
Beginning balance, treasury shares (in shares) at Dec. 31, 2018	(15,329,817)		(15,329,817)
Condensed Unaudited Consolidated Statements of Equity
Net income (loss)	$ 43,107				43,112		43,112	(5)
Other comprehensive (loss) income	(5,562)					(5,562)	(5,562)
Non-cash stock-based compensation	3,720			3,720			3,720
Issuance of restricted shares, net (in shares)		233,362
Issuance of restricted shares, net	0	$ 23		(23)			0
Other stock issuances, net of shares withheld for taxes (in shares)		31,027
Other stock issuances, net of shares withheld for taxes	1,045	$ 3		1,042			1,045
Acquisition of treasury stock, at cost (in shares)			(15,100)
Acquisition of treasury stock, at cost	$ (602)		$ (602)				(602)
Ending balance, common shares outstanding (in shares) at Mar. 31, 2019	91,591,398	91,591,398
Ending balance at Mar. 31, 2019	$ 1,433,732	$ 9,159	$ (466,727)	$ 793,748	$ 1,161,487	$ (66,056)	$ 1,431,611	$ 2,121
Ending balance, treasury shares (in shares) at Mar. 31, 2019	(15,344,917)		(15,344,917)