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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator        
Income from continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars) $ 71,021 $ 56,776 $ 126,677 $ 109,920
Loss from discontinued operation, net of income taxes (in US dollars) (205) (18) (487) (522)
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 70,816 $ 56,758 $ 126,190 $ 109,398
Denominator        
Weighted average shares outstanding used to compute basic earnings (loss) per common share (in shares) 58,332,934 59,290,420 58,531,150 59,527,863
Effect of dilutive securities-Share-based awards (in shares) 337,661 348,641 331,355 345,553
Shares used to compute diluted earnings (loss) per common share (in shares) 58,670,595 59,639,061 58,862,505 59,873,416
Basic earnings (loss) per common share:        
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 1.22 $ 0.96 $ 2.16 $ 1.85
From discontinued operation (in US dollars per share) 0.00 0.00 (0.01) (0.01)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 1.22 0.96 2.15 1.84
Diluted earnings (loss) per common share:        
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 1.21 0.95 2.15 1.84
From discontinued operation (in US dollars per share) 0.00 0.00 (0.01) (0.01)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 1.21 $ 0.95 $ 2.14 $ 1.83
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) 500 47,200 550 0