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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income including noncontrolling interests		$ 325,140	$ 283,577	$ 227,193
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments		1,689	(1,322)	(1,384)
Changes in post retirement plans	[1]	(3,315)	7,860	8,887
Other comprehensive (loss) income		(1,626)	6,538	7,503
Comprehensive income		323,514	290,115	234,696
Less: Comprehensive (income) loss attributable to noncontrolling interests		0	(46)	3
Comprehensive income attributable to EMCOR Group, Inc.		$ 323,514	$ 290,069	$ 234,699
[1] Net of tax benefit (provision) of $0.7 million, $(2.1) million, and $(1.8) million for the years ended December 31, 2019, 2018, and 2017, respectively.

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