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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator                      
Income from continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars)                 $ 185,077 $ 172,346 $ 173,354
Loss from discontinued operation, net of income taxes (in US dollars)                 (3,142) (60) (4,690)
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 40,676 $ 51,531 $ 55,380 $ 34,348 $ 51,066 $ 41,522 $ 46,849 $ 32,849 $ 181,935 $ 172,286 $ 168,664
Denominator                      
Weighted average shares outstanding used to compute basic earnings (loss) per common share (in shares)                 60,769,808 62,789,120 66,331,886
Effect of dilutive securities-Share-based awards (in shares)                 436,984 518,392 730,623
Shares used to compute diluted earnings (loss) per common share (in shares)                 61,206,792 63,307,512 67,062,509
Basic earnings (loss) per common share:                      
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 0.70 $ 0.85 $ 0.93 $ 0.57 $ 0.81 $ 0.66 $ 0.75 $ 0.53 $ 3.05 $ 2.74 $ 2.61
From discontinued operation (in US dollars per share) (0.03) (0.01) (0.02) 0.00 0.01 0.00 0.00 (0.01) (0.05) 0.00 (0.07)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 0.67 0.84 0.91 0.57 0.82 0.66 0.75 0.52 3.00 2.74 2.54
Diluted earnings (loss) per common share:                      
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 0.69 0.85 0.92 0.56 0.80 0.66 0.74 0.52 3.02 2.72 2.59
From discontinued operation (in US dollars per share) (0.03) (0.01) (0.02) 0.00 0.01 0.00 0.00 0.00 (0.05) 0.00 (0.07)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 0.66 $ 0.84 $ 0.90 $ 0.56 $ 0.81 $ 0.66 $ 0.74 $ 0.52 $ 2.97 $ 2.72 $ 2.52