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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator        
Income from continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars) $ 51,937 $ 41,792 $ 142,843 $ 121,959
Loss from discontinued operation, net of income taxes (in US dollars) (406) (270) (1,584) (739)
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 51,531 $ 41,522 $ 141,259 $ 121,220
Denominator        
Weighted average shares outstanding used to compute basic earnings (loss) per common share (in shares) 60,889,484 62,901,923 60,866,532 62,921,956
Effect of dilutive securities-Share-based awards (in shares) 428,573 490,560 423,856 521,071
Shares used to compute diluted earnings (loss) per common share (in shares) 61,318,057 63,392,483 61,290,388 63,443,027
Basic earnings (loss) per common share:        
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 0.85 $ 0.66 $ 2.35 $ 1.94
From discontinued operation (in US dollars per share) (0.01) 0.00 (0.03) (0.01)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 0.84 0.66 2.32 1.93
Diluted earnings (loss) per common share:        
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 0.85 0.66 2.33 1.92
From discontinued operation (in US dollars per share) (0.01) 0.00 (0.03) (0.01)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 0.84 $ 0.66 $ 2.30 $ 1.91
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive restricted stock units excluded from calculation of diluted earnings per share (in shares) 0 0 0 0