Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Revenues	$ 1,556,753	$ 1,590,035	$ 3,125,154	$ 3,128,556
Cost of sales	1,375,218	1,396,071	2,752,481	2,753,899
Gross profit	181,535	193,964	372,673	374,657
Selling, general and administrative expenses	139,623	137,675	278,133	272,179
Restructuring expenses	5,813	0	7,176	0
Operating income	36,099	56,289	87,364	102,478
Interest expense	(1,764)	(1,878)	(3,626)	(3,653)
Interest income	270	368	627	784
Income before income taxes	34,605	54,779	84,365	99,609
Income tax provision	13,131	20,799	32,173	37,821
Net income including noncontrolling interests	21,474	33,980	52,192	61,788
Less: Net income attributable to noncontrolling interests	(460)	(532)	(1,011)	(1,195)
Net income attributable to EMCOR Group, Inc. (in US dollars)	$ 21,014	$ 33,448	$ 51,181	$ 60,593
Basic earnings per common share:
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	$ 0.31	$ 0.50	$ 0.76	$ 0.91
Diluted earnings per common share:
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	$ 0.31	$ 0.49	$ 0.75	$ 0.89
Dividends declared per common share (in US dollars per share)	$ 0.06	$ 0.1	$ 0.06	$ 0.15