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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator        
Income from continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars) $ 83,972 $ 71,021 $ 156,382 $ 126,677
Loss from discontinued operation, net of income taxes (in US dollars) 0 (205) 0 (487)
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 83,972 $ 70,816 $ 156,382 $ 126,190
Denominator        
Weighted average shares outstanding used to compute basic earnings (loss) per common share (in shares) 56,181,864 58,332,934 56,175,219 58,531,150
Effect of dilutive securities-Share-based awards (in shares) 317,650 337,661 286,758 331,355
Shares used to compute diluted earnings (loss) per common share (in shares) 56,499,514 58,670,595 56,461,977 58,862,505
Basic earnings (loss) per common share:        
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 1.49 $ 1.22 $ 2.78 $ 2.16
From discontinued operation (in US dollars per share) 0 0.00 0 (0.01)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 1.49 1.22 2.78 2.15
Diluted earnings (loss) per common share:        
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 1.49 1.21 2.77 2.15
From discontinued operation (in US dollars per share) 0 0.00 0 (0.01)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 1.49 $ 1.21 $ 2.77 $ 2.14
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) 0 500 25,061 550