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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Numerator        
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 169,409 $ 105,772 $ 421,477 $ 279,822
Denominator        
Weighted average shares outstanding used to compute basic earnings per common share (in shares) 47,173,974 48,867,420 47,446,298 50,676,365
Effect of dilutive securities-Share-based awards (in shares) 224,223 182,731 196,465 197,010
Shares used to compute diluted earnings per common share (in shares) 47,398,197 49,050,151 47,642,763 50,873,375
Basic earnings per common share (in US dollars per share) $ 3.59 $ 2.16 $ 8.88 $ 5.52
Diluted earnings per common share (in US dollars per share) $ 3.57 $ 2.16 $ 8.85 $ 5.50
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) 400 850 800 1,350