Consolidated Statements of Equity (Unaudited) - 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]
Beginning balance, common shares outstanding (in shares) at Dec. 31, 2018		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)
Condensed Unaudited Consolidated Statements of Equity
Net income (loss)	43,107				43,112		43,112	(5)
Other comprehensive loss	(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
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)
Beginning balance, common shares outstanding (in shares) at Dec. 31, 2019	91,909,430	91,909,430
Beginning balance at Dec. 31, 2019	$ 1,791,691	$ 9,191	$ (466,727)	809,753	1,510,709	(75,706)	1,787,220	4,471
Beginning balance, treasury shares (in shares) at Dec. 31, 2019	(15,344,917)		(15,344,917)
Condensed Unaudited Consolidated Statements of Equity
Net income (loss)	$ 36,062				36,230		36,230	(168)
Other comprehensive loss	(23,257)					(23,257)	(23,257)
Non-cash stock-based compensation	4,049			4,049			4,049
Issuance of restricted shares, net (in shares)		694,779
Issuance of restricted shares, net	0	$ 69		(69)			0
Other stock issuances, net of shares withheld for taxes (in shares)		13,823
Other stock issuances, net of shares withheld for taxes	$ 694	$ 2		692			694
Acquisition of treasury stock, at cost (in shares)	(3,600,000)		(3,569,924)
Acquisition of treasury stock, at cost	$ (119,426)		$ (119,426)				(119,426)
Ending balance, common shares outstanding (in shares) at Mar. 31, 2020	92,618,032	92,618,032
Ending balance at Mar. 31, 2020	$ 1,689,813	$ 9,262	$ (586,153)	$ 814,425	$ 1,546,939	$ (98,963)	$ 1,685,510	$ 4,303
Ending balance, treasury shares (in shares) at Mar. 31, 2020	(18,914,841)		(18,914,841)