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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Numerator      
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 1,007,145 $ 632,994 $ 406,122
Denominator      
Weighted average shares outstanding used to compute basic earnings per common share (in shares) 46,616,079 47,358,467 49,931,940
Effect of dilutive securities-Share-based awards (in shares) 192,214 205,791 204,322
Shares used to compute diluted earnings per common share (in shares) 46,808,293 47,564,258 50,136,262
Basic earnings per common share (in US dollars per share) $ 21.61 $ 13.37 $ 8.13
Diluted earnings per common share (in US dollars per share) $ 21.52 $ 13.31 $ 8.10