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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Numerator      
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 406,122 $ 383,532 $ 132,943
Denominator      
Weighted average shares outstanding used to compute basic earnings per common share (in shares) 49,931,940 54,068,982 55,196,173
Effect of dilutive securities-Share-based awards (in shares) 204,322 278,552 225,098
Shares used to compute diluted earnings per common share (in shares) 50,136,262 54,347,534 55,421,271
Basic earnings per common share (in US dollars per share) $ 8.13 $ 7.09 $ 2.41
Diluted earnings per common share (in US dollars per share) $ 8.10 $ 7.06 $ 2.40