Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income including noncontrolling interests		$ 81,834	$ 79,421	$ 238,216	$ 205,611
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments		(983)	(289)	(1,280)	(669)
Post retirement plans, amortization of actuarial loss included in net income (1)	[1]	509	573	1,572	1,553
Other comprehensive (loss) income		(474)	284	292	884
Comprehensive income		81,360	79,705	238,508	206,495
Less: Comprehensive income attributable to noncontrolling interests		0	(48)	0	(48)
Comprehensive income attributable to EMCOR Group, Inc.		$ 81,360	$ 79,657	$ 238,508	$ 206,447

[1] Net of tax of $0.1 million for each of the three months ended September 30, 2019 and 2018, and net of tax of $0.4 million and $0.7 million for the nine months ended September 30, 2019 and 2018, respectively.