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, 2019		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)
Condensed Unaudited Consolidated Statements of Equity
Net income (loss)	36,062				36,230		36,230	(168)
Other comprehensive income (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
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)
Beginning balance, common shares outstanding (in shares) at Dec. 31, 2020	93,107,440	93,107,440
Beginning balance at Dec. 31, 2020	$ 2,005,525	$ 9,311	$ (586,955)	837,453	1,833,557	(91,444)	2,001,922	3,603
Beginning balance, treasury shares (in shares) at Dec. 31, 2020	(18,941,926)		(18,941,926)
Condensed Unaudited Consolidated Statements of Equity
Net income (loss)	$ 66,112				65,649		65,649	463
Other comprehensive income (loss)	14,210					14,210	14,210
Non-cash stock-based compensation	5,528			5,528			5,528
Issuance of restricted shares, net (in shares)		138,081
Issuance of restricted shares, net	0	$ 14		(14)			0
Other stock issuances, net of shares withheld for taxes (in shares)		7,747
Other stock issuances, net of shares withheld for taxes	$ (2,400)	$ 0		(2,400)			(2,400)
Acquisition of treasury stock, at cost (in shares)	0
Ending balance, common shares outstanding (in shares) at Mar. 31, 2021	93,253,268	93,253,268
Ending balance at Mar. 31, 2021	$ 2,088,975	$ 9,325	$ (586,955)	$ 840,567	$ 1,899,206	$ (77,234)	$ 2,084,909	$ 4,066
Ending balance, treasury shares (in shares) at Mar. 31, 2021	(18,941,926)		(18,941,926)