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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Numerator    
Income from continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars) $ 53,144 $ 34,429
Loss from discontinued operation, net of income taxes (in US dollars) (504) (81)
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 52,640 $ 34,348
Denominator    
Weighted average shares outstanding used to compute basic earnings (loss) per common share (in shares) 59,769,136 60,903,335
Effect of dilutive securities-Share-based awards (in shares) 342,466 447,275
Shares used to compute diluted earnings (loss) per common share (in shares) 60,111,602 61,350,610
Basic earnings (loss) per common share:    
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 0.89 $ 0.57
From discontinued operation (in US dollars per share) (0.01) 0.00
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 0.88 0.57
Diluted earnings (loss) per common share:    
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 0.88 0.56
From discontinued operation (in US dollars per share) (0.01) 0.00
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 0.87 $ 0.56
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) 500 0