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	209,774				209,726		209,726	48
Other comprehensive income (loss)	(23,200)					(23,200)	(23,200)
Non-cash stock-based compensation	15,538			15,538			15,538
Issuance (forfeiture) of restricted shares, net (in shares)		694,746
Forfeiture of restricted shares, net	0	$ 69		(69)
Other stock issuances (shares withheld for taxes), net (in shares)		156,865
Other stock issuances (shares withheld for taxes), net	$ 4,289	$ 16		4,273			4,289
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)
Distributions to noncontrolling interests	(719)							(719)
Ending balance, common shares outstanding (in shares) at Sep. 30, 2020		92,761,041
Ending balance at Sep. 30, 2020	1,877,145	$ 9,276	$ (586,955)	829,495	1,720,435	(98,906)	1,873,345	3,800
Ending balance, treasury shares (in shares) at Sep. 30, 2020			(18,941,926)
Beginning balance, common shares outstanding (in shares) at Jun. 30, 2020		92,665,097
Beginning balance at Jun. 30, 2020	1,750,836	$ 9,267	$ (586,955)	821,584	1,603,944	(101,129)	1,746,711	4,125
Beginning balance, treasury shares (in shares) at Jun. 30, 2020			(18,941,926)
Condensed Unaudited Consolidated Statements of Equity
Net income	116,885				116,491		116,491	394
Other comprehensive income (loss)	2,223					2,223	2,223
Non-cash stock-based compensation	5,639			5,639			5,639
Issuance (forfeiture) of restricted shares, net (in shares)		1,391
Other stock issuances (shares withheld for taxes), net (in shares)		94,553
Other stock issuances (shares withheld for taxes), net	2,281	$ 9		2,272			2,281
Distributions to noncontrolling interests	(719)							(719)
Ending balance, common shares outstanding (in shares) at Sep. 30, 2020		92,761,041
Ending balance at Sep. 30, 2020	$ 1,877,145	$ 9,276	$ (586,955)	829,495	1,720,435	(98,906)	1,873,345	3,800
Ending balance, treasury shares (in shares) at Sep. 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	$ 254,334				252,187		252,187	2,147
Other comprehensive income (loss)	9,269					9,269	9,269
Non-cash stock-based compensation	17,673			17,673			17,673
Issuance (forfeiture) of restricted shares, net (in shares)		132,021
Forfeiture of restricted shares, net	0	$ 13		(13)
Other stock issuances (shares withheld for taxes), net (in shares)		7,339
Other stock issuances (shares withheld for taxes), net	$ (2,441)	$ 1		(2,442)			(2,441)
Acquisition of treasury stock, at cost (in shares)	0
Distributions to noncontrolling interests	$ (76)							(76)
Purchase of non-controlling interests	$ (6,802)			(5,429)			(5,429)	(1,373)
Ending balance, common shares outstanding (in shares) at Sep. 30, 2021	93,246,800	93,246,800
Ending balance at Sep. 30, 2021	$ 2,277,482	$ 9,325	$ (586,955)	847,242	2,085,744	(82,175)	2,273,181	4,301
Ending balance, treasury shares (in shares) at Sep. 30, 2021	(18,941,926)		(18,941,926)
Beginning balance, common shares outstanding (in shares) at Jun. 30, 2021		93,256,202
Beginning balance at Jun. 30, 2021	$ 2,161,369	$ 9,326	$ (586,955)	841,190	1,974,657	(79,856)	2,158,362	3,007
Beginning balance, treasury shares (in shares) at Jun. 30, 2021			(18,941,926)
Condensed Unaudited Consolidated Statements of Equity
Net income	112,457				111,087		111,087	1,370
Other comprehensive income (loss)	(2,319)					(2,319)	(2,319)
Non-cash stock-based compensation	6,073			6,073			6,073
Issuance (forfeiture) of restricted shares, net (in shares)		(9,174)
Forfeiture of restricted shares, net	0	$ (1)		1
Other stock issuances (shares withheld for taxes), net (in shares)		(228)
Other stock issuances (shares withheld for taxes), net	$ (22)			(22)			(22)
Acquisition of treasury stock, at cost (in shares)	0
Distributions to noncontrolling interests	$ (76)							(76)
Ending balance, common shares outstanding (in shares) at Sep. 30, 2021	93,246,800	93,246,800
Ending balance at Sep. 30, 2021	$ 2,277,482	$ 9,325	$ (586,955)	$ 847,242	$ 2,085,744	$ (82,175)	$ 2,273,181	$ 4,301
Ending balance, treasury shares (in shares) at Sep. 30, 2021	(18,941,926)		(18,941,926)