Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Revenues	$ 1,566,711	$ 1,605,315	$ 4,710,169	$ 4,684,248
Cost of sales	1,344,482	1,398,753	4,051,496	4,099,473
Gross profit	222,229	206,562	658,673	584,775
Selling, general and administrative expenses	159,983	147,917	454,243	419,679
Restructuring expenses	398	601	799	652
Gain on sale of building	11,749	0	11,749	0
Operating income	73,597	58,044	215,380	164,444
Interest expense	(2,397)	(2,351)	(6,887)	(5,978)
Interest income	186	234	641	862
Income from continuing operations before income taxes	71,386	55,927	209,134	159,328
Income tax provision	23,998	24,024	75,428	60,622
Income from continuing operations	47,388	31,903	133,706	98,706
Loss from discontinued operation, net of income taxes	(611)	(3,010)	(4,087)	(17,621)
Net income including noncontrolling interests	46,777	28,893	129,619	81,085
Less: Net income attributable to noncontrolling interests	(1,753)	(2,203)	(3,421)	(3,214)
Net income attributable to EMCOR Group, Inc. (in US dollars)	$ 45,024	$ 26,690	$ 126,198	$ 77,871
Basic earnings (loss) per common share:
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	$ 0.68	$ 0.44	$ 1.94	$ 1.42
From discontinued operation (in US dollars per share)	$ (0.01)	$ (0.04)	$ (0.06)	$ (0.26)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	$ 0.67	$ 0.40	$ 1.88	$ 1.16
Diluted earnings (loss) per common share:
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	$ 0.68	$ 0.43	$ 1.92	$ 1.40
From discontinued operation (in US dollars per share)	$ (0.01)	$ (0.04)	$ (0.06)	$ (0.26)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	$ 0.67	$ 0.39	$ 1.86	$ 1.14
Dividends declared per common share (in US dollars per share)	$ 0.08	$ 0.06	$ 0.24	$ 0.12