Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income including noncontrolling interests		$ 283,577	$ 227,193	$ 182,153
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments		(1,322)	(1,384)	(1,434)
Changes in post retirement plans	[1]	7,860	8,887	(23,316)
Other comprehensive income (loss)		6,538	7,503	(24,750)
Comprehensive income		290,115	234,696	157,403
Less: Comprehensive (income) loss attributable to noncontrolling interests		(46)	3	(218)
Comprehensive income attributable to EMCOR Group, Inc.		$ 290,069	$ 234,699	$ 157,185

[1] Net of tax (provision) benefit of $(2.1) million, $(1.8) million and $5.1 million for the years ended December 31, 2018, 2017 and 2016, respectively.