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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Numerator      
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 632,994 $ 406,122 $ 383,532
Denominator      
Weighted average shares outstanding used to compute basic earnings per common share (in shares) 47,358,467 49,931,940 54,068,982
Effect of dilutive securities-Share-based awards (in shares) 205,791 204,322 278,552
Shares used to compute diluted earnings per common share (in shares) 47,564,258 50,136,262 54,347,534
Basic earnings per common share (in US dollars per share) $ 13.37 $ 8.13 $ 7.09
Diluted earnings per common share (in US dollars per share) $ 13.31 $ 8.10 $ 7.06