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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator    
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars) $ 84,774 $ 75,665
Denominator    
Weighted average shares outstanding used to compute basic earnings per common share (in shares) 54,896,548 56,007,122
Effect of dilutive securities-Share-based awards (in shares) 238,756 203,606
Shares used to compute diluted earnings per common share (in shares) 55,135,304 56,210,728
Basic earnings per common share (in US dollars per share) $ 1.54 $ 1.35
Diluted earnings per common share (in US dollars per share) $ 1.54 $ 1.35
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) 0 95,084