Condensed Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenues	$ 1,744,970	$ 1,589,187
Cost of sales	1,521,862	1,372,258
Gross profit	223,108	216,929
Selling, general and administrative expenses	167,402	161,591
Restructuring expenses	91	8
Operating income	55,615	55,330
Interest expense	(2,376)	(2,216)
Interest income	165	176
Income from continuing operations before income taxes	53,404	53,290
Income tax provision	18,969	20,225
Income from continuing operations	34,435	33,065
Loss from discontinued operation, net of income taxes	(81)	(355)
Net income including noncontrolling interests	34,354	32,710
Less: Net (income) loss attributable to noncontrolling interests	(6)	139
Net income attributable to EMCOR Group, Inc. (in US dollars)	$ 34,348	$ 32,849
Basic earnings (loss) per common share:
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	$ 0.57	$ 0.53
From discontinued operation (in US dollars per share)	0.00	(0.01)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	0.57	0.52
Diluted earnings (loss) per common share:
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	0.56	0.52
From discontinued operation (in US dollars per share)	0.00	0.00
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	0.56	0.52
Dividends declared per common share (in US dollars per share)	$ 0.08	$ 0.08