Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income including noncontrolling interests		$ 383,701	$ 132,943	$ 325,140
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments		(360)	2,088	1,689
Changes in post retirement plans	[1]	26,031	(22,033)	(3,315)
Other comprehensive income (loss)		25,671	(19,945)	(1,626)
Comprehensive income		409,372	112,998	323,514
Comprehensive income attributable to noncontrolling interests		169	0	0
Comprehensive income attributable to EMCOR Group, Inc.		$ 409,203	$ 112,998	$ 323,514

[1] Net of tax (provision) benefit of $(8.7) million, $5.1 million, and $0.7 million for the years ended December 31, 2021, 2020, and 2019, respectively.