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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Numerator        
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars) $ 100,664 $ 97,350 $ 174,050 $ 182,124
Denominator        
Weighted average shares outstanding used to compute basic earnings per common share (in shares) 50,507,024 54,301,466 51,610,014 54,594,208
Effect of dilutive securities-Share-based awards (in shares) 204,746 286,347 204,150 262,551
Shares used to compute diluted earnings per common share (in shares) 50,711,770 54,587,813 51,814,164 54,856,759
Basic earnings per common share (in US dollars per share) $ 1.99 $ 1.79 $ 3.37 $ 3.34
Diluted earnings per common share (in US dollars per share) $ 1.99 $ 1.78 $ 3.36 $ 3.32
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) 57,949 1,500 57,899 14,136