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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator        
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars) $ 105,772 $ 99,740 $ 279,822 $ 281,864
Denominator        
Weighted average shares outstanding used to compute basic earnings per common share (in shares) 48,867,420 53,700,603 50,676,365 54,290,002
Effect of dilutive securities-Share-based awards (in shares) 182,731 284,055 197,010 269,719
Shares used to compute diluted earnings per common share (in shares) 49,050,151 53,984,658 50,873,375 54,559,721
Basic earnings per common share (in US dollars per share) $ 2.16 $ 1.86 $ 5.52 $ 5.19
Diluted earnings per common share (in US dollars per share) $ 2.16 $ 1.85 $ 5.50 $ 5.17
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) 850 0 1,350 2,550