Condensed Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Revenues	$ 1,652,585	$ 1,552,918	$ 3,241,772	$ 3,143,457
Cost of sales	1,413,058	1,332,677	2,785,316	2,707,013
Gross profit	239,527	220,241	456,456	436,444
Selling, general and administrative expenses	161,391	150,406	322,982	294,260
Restructuring expenses	433	176	441	401
Operating income	77,703	69,659	133,033	141,783
Interest expense	(2,208)	(2,242)	(4,424)	(4,490)
Interest income	182	221	358	455
Income from continuing operations before income taxes	75,677	67,638	128,967	137,748
Income tax provision	28,727	25,203	48,952	51,430
Income from continuing operations	46,950	42,435	80,015	86,318
Loss from discontinued operation, net of income taxes	(114)	(1,435)	(469)	(3,476)
Net income including noncontrolling interests	46,836	41,000	79,546	82,842
Less: Net loss (income) attributable to noncontrolling interests	13	(1,087)	152	(1,668)
Net income attributable to EMCOR Group, Inc. (in US dollars)	$ 46,849	$ 39,913	$ 79,698	$ 81,174
Basic earnings (loss) per common share:
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	$ 0.75	$ 0.61	$ 1.27	$ 1.26
From discontinued operation (in US dollars per share)	0.00	(0.02)	(0.01)	(0.05)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	0.75	0.59	1.26	1.21
Diluted earnings (loss) per common share:
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	0.74	0.61	1.26	1.24
From discontinued operation (in US dollars per share)	0.00	(0.02)	(0.01)	(0.05)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	0.74	0.59	1.25	1.19
Dividends declared per common share (in US dollars per share)	$ 0.08	$ 0.08	$ 0.16	$ 0.16