Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Capital Surplus	Retained Earnings	Accumulated Other Comprehensive Loss	Total MasTec, Inc. Shareholders’ Equity	Non-Controlling Interests
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)	92,889				93,235		93,235	(346)
Other comprehensive income (loss)	(25,423)					(25,423)	(25,423)
Non-cash stock-based compensation	9,899			9,899			9,899
Issuance (forfeiture) of restricted shares, net (in shares)		693,355
Issuance of restricted shares, net	0	$ 69		(69)
Other stock issuances (shares withheld for taxes), net (in shares)		62,312
Other stock issuances, net of shares withheld for taxes	$ 2,008	$ 7		2,001			2,008
Acquisition of treasury stock, at cost (in shares)	(3,600,000)		(3,597,009)
Acquisition of treasury stock, at cost	$ (120,228)		$ (120,228)				(120,228)
Ending balance, common shares outstanding (in shares) at Jun. 30, 2020		92,665,097
Ending balance at Jun. 30, 2020	1,750,836	$ 9,267	$ (586,955)	821,584	1,603,944	(101,129)	1,746,711	4,125
Ending balance, treasury shares (in shares) at Jun. 30, 2020			(18,941,926)
Beginning balance, common shares outstanding (in shares) at Mar. 31, 2020		92,618,032
Beginning balance at Mar. 31, 2020	1,689,813	$ 9,262	$ (586,153)	814,425	1,546,939	(98,963)	1,685,510	4,303
Beginning balance, treasury shares (in shares) at Mar. 31, 2020			(18,914,841)
Condensed Unaudited Consolidated Statements of Equity
Net income (loss)	56,827				57,005		57,005	(178)
Other comprehensive income (loss)	(2,166)					(2,166)	(2,166)
Non-cash stock-based compensation	5,850			5,850			5,850
Issuance (forfeiture) of restricted shares, net (in shares)		(1,424)
Other stock issuances (shares withheld for taxes), net (in shares)		48,489
Other stock issuances, net of shares withheld for taxes	1,314	$ 5		1,309			1,314
Acquisition of treasury stock, at cost (in shares)			(27,085)
Acquisition of treasury stock, at cost	(802)		$ (802)				(802)
Ending balance, common shares outstanding (in shares) at Jun. 30, 2020		92,665,097
Ending balance at Jun. 30, 2020	$ 1,750,836	$ 9,267	$ (586,955)	821,584	1,603,944	(101,129)	1,746,711	4,125
Ending balance, treasury shares (in shares) at Jun. 30, 2020			(18,941,926)
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)	$ 141,877				141,100		141,100	777
Other comprehensive income (loss)	11,588					11,588	11,588
Non-cash stock-based compensation	11,600			11,600			11,600
Issuance (forfeiture) of restricted shares, net (in shares)		141,195
Issuance of restricted shares, net	0	$ 14		(14)
Other stock issuances (shares withheld for taxes), net (in shares)		7,567
Other stock issuances, net of shares withheld for taxes	(2,419)	$ 1		(2,420)			(2,419)
Purchase of non-controlling interests	$ (6,802)			(5,429)			(5,429)	(1,373)
Acquisition of treasury stock, at cost (in shares)	0
Ending balance, common shares outstanding (in shares) at Jun. 30, 2021	93,256,202	93,256,202
Ending balance at Jun. 30, 2021	$ 2,161,369	$ 9,326	$ (586,955)	841,190	1,974,657	(79,856)	2,158,362	3,007
Ending balance, treasury shares (in shares) at Jun. 30, 2021	(18,941,926)		(18,941,926)
Beginning balance, common shares outstanding (in shares) at Mar. 31, 2021		93,253,268
Beginning balance at Mar. 31, 2021	$ 2,088,975	$ 9,325	$ (586,955)	840,567	1,899,206	(77,234)	2,084,909	4,066
Beginning balance, treasury shares (in shares) at Mar. 31, 2021			(18,941,926)
Condensed Unaudited Consolidated Statements of Equity
Net income (loss)	75,765				75,451		75,451	314
Other comprehensive income (loss)	(2,622)					(2,622)	(2,622)
Non-cash stock-based compensation	6,072			6,072			6,072
Issuance (forfeiture) of restricted shares, net (in shares)		3,114
Other stock issuances (shares withheld for taxes), net (in shares)		(180)
Other stock issuances, net of shares withheld for taxes	(19)	$ 1		(20)			(19)
Purchase of non-controlling interests	$ (6,802)			(5,429)			(5,429)	(1,373)
Acquisition of treasury stock, at cost (in shares)	0
Ending balance, common shares outstanding (in shares) at Jun. 30, 2021	93,256,202	93,256,202
Ending balance at Jun. 30, 2021	$ 2,161,369	$ 9,326	$ (586,955)	$ 841,190	$ 1,974,657	$ (79,856)	$ 2,158,362	$ 3,007
Ending balance, treasury shares (in shares) at Jun. 30, 2021	(18,941,926)		(18,941,926)