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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Numerator    
Income from continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars) $ 55,656 $ 53,144
Loss from discontinued operation, net of income taxes (in US dollars) (282) (504)
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 55,374 $ 52,640
Denominator    
Weighted average shares outstanding used to compute basic earnings (loss) per common share (in shares) 58,739,115 59,769,136
Effect of dilutive securities-Share-based awards (in shares) 325,049 342,466
Shares used to compute diluted earnings (loss) per common share (in shares) 59,064,164 60,111,602
Basic earnings (loss) per common share:    
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 0.95 $ 0.89
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) 0.95 0.88
Diluted earnings (loss) per common share:    
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 0.94 0.88
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) $ 0.94 $ 0.87
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive share-based awards excluded from calculation of diluted earnings per share (in shares) 20,675 500