Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income including noncontrolling interests		$ 227,193	$ 182,153	$ 172,507
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments		(1,384)	(1,434)	(621)
Changes in post retirement plans	[1]	8,887	(23,316)	6,865
Other comprehensive income (loss)		7,503	(24,750)	6,244
Comprehensive income		234,696	157,403	178,751
Less: Comprehensive loss (income) attributable to noncontrolling interests		3	(218)	(221)
Comprehensive income attributable to EMCOR Group, Inc.		$ 234,699	$ 157,185	$ 178,530

[1] Net of tax (provision) benefit of $(1.8) million, $5.1 million and $(1.6) million for the years ended December 31, 2017, 2016 and 2015, respectively.