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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator    
Income from continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars) $ 72,410 $ 55,656
Loss from discontinued operation, net of income taxes (in US dollars) 0 (282)
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 72,410 $ 55,374
Denominator    
Weighted average shares outstanding used to compute basic earnings (loss) per common share (in shares) 56,168,356 58,739,115
Effect of dilutive securities-Share-based awards (in shares) 255,866 325,049
Shares used to compute diluted earnings (loss) per common share (in shares) 56,424,222 59,064,164
Basic earnings (loss) per common share:    
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 1.29 $ 0.95
From discontinued operation (in US dollars per share) 0 0.00
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 1.29 0.95
Diluted earnings (loss) per common share:    
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 1.28 0.94
From discontinued operation (in US dollars per share) 0 0.00
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 1.28 $ 0.94
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) 2,150 20,675