Condensed Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenues	$ 2,592,549	$ 2,304,049
Cost of sales	2,239,994	1,962,976
Gross profit	352,555	341,073
Selling, general and administrative expenses	252,598	224,069
Operating income	99,957	117,004
Net periodic pension (cost) income	1,169	908
Interest expense, net	(1,289)	(1,363)
Income before income taxes	99,837	116,549
Income tax provision	26,451	31,604
Net income including noncontrolling interests	73,386	84,945
Net income attributable to noncontrolling interests	0	171
Net income attributable to EMCOR Group, Inc. (in US dollars)	$ 73,386	$ 84,774
Basic earnings per common share (in US dollars per share)	$ 1.39	$ 1.54
Diluted earnings per common share (in US dollars per share)	1.39	1.54
Dividends declared per common share (in US dollars per share)	$ 0.13	$ 0.13