Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Net income attributable to EMCOR Group, Inc. common stockholders	$ 41,261	$ 30,167
Weighted average shares outstanding used to compute basic earnings per common share (in shares)	67,188,577	67,110,334
Effect of dilutive securities-Share-based awards (in shares)	812,628	988,787
Shares used to compute diluted earnings per common share (in shares)	68,001,205	68,099,121
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	$ 0.61	$ 0.45
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)	$ 0.61	$ 0.44
Anti-dilutive stock options excluded from calculation of diluted earnings per share (in shares)	0	0