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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator        
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars) $ 99,740 $ 61,186 $ 281,864 $ 53,162
Denominator        
Weighted average shares outstanding used to compute basic earnings per common share (in shares) 53,700,603 54,979,310 54,290,002 55,302,385
Effect of dilutive securities-Share-based awards (in shares) 284,055 220,935 269,719 207,337
Shares used to compute diluted earnings per common share (in shares) 53,984,658 55,200,245 54,559,721 55,509,722
Basic earnings per common share (in US dollars per share) $ 1.86 $ 1.11 $ 5.19 $ 0.96
Diluted earnings per common share (in US dollars per share) $ 1.85 $ 1.11 $ 5.17 $ 0.96
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 19,450 2,550 94,155