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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator        
Income from continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars) $ 56,776 $ 56,477 $ 109,920 $ 90,906
Loss from discontinued operation, net of income taxes (in US dollars) (18) (1,097) (522) (1,178)
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 56,758 $ 55,380 $ 109,398 $ 89,728
Denominator        
Weighted average shares outstanding used to compute basic earnings (loss) per common share (in shares) 59,290,420 60,808,502 59,527,863 60,854,781
Effect of dilutive securities-Share-based awards (in shares) 348,641 395,719 345,553 421,497
Shares used to compute diluted earnings (loss) per common share (in shares) 59,639,061 61,204,221 59,873,416 61,276,278
Basic earnings (loss) per common share:        
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 0.96 $ 0.93 $ 1.85 $ 1.49
From discontinued operation (in US dollars per share) 0.00 (0.02) (0.01) (0.02)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 0.96 0.91 1.84 1.47
Diluted earnings (loss) per common share:        
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 0.95 0.92 1.84 1.48
From discontinued operation (in US dollars per share) 0.00 (0.02) (0.01) (0.02)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 0.95 $ 0.90 $ 1.83 $ 1.46
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) 47,200 0 0 0