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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator        
Income from continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars) $ 81,834 $ 79,896 $ 238,216 $ 206,573
Loss from discontinued operation, net of income taxes (in US dollars) 0 (523) 0 (1,010)
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 81,834 $ 79,373 $ 238,216 $ 205,563
Denominator        
Weighted average shares outstanding used to compute basic earnings (loss) per common share (in shares) 56,216,840 58,208,203 56,189,388 58,422,928
Effect of dilutive securities-Share-based awards (in shares) 341,610 333,107 305,042 331,939
Shares used to compute diluted earnings (loss) per common share (in shares) 56,558,450 58,541,310 56,494,430 58,754,867
Basic earnings (loss) per common share:        
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 1.46 $ 1.37 $ 4.24 $ 3.54
From discontinued operation (in US dollars per share) 0 (0.01) 0 (0.02)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 1.46 1.36 4.24 3.52
Diluted earnings (loss) per common share:        
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 1.45 1.36 4.22 3.52
From discontinued operation (in US dollars per share) 0 (0.01) 0 (0.02)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 1.45 $ 1.35 $ 4.22 $ 3.50
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) 0 0 0 550