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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Numerator                      
Income from continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars)                 $ 325,140 $ 285,876 $ 228,053
Loss from discontinued operation, net of income taxes (in US dollars)                 0 (2,345) (857)
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 86,924 $ 81,834 $ 83,972 $ 72,410 $ 77,968 $ 79,373 $ 70,816 $ 55,374 $ 325,140 $ 283,531 $ 227,196
Denominator                      
Weighted average shares outstanding used to compute basic earnings (loss) per common share (in shares)                 56,208,280 58,112,838 59,254,256
Effect of dilutive securities-Share-based awards (in shares)                 311,001 330,629 364,713
Shares used to compute diluted earnings (loss) per common share (in shares)                 56,519,281 58,443,467 59,618,969
Basic earnings (loss) per common share:                      
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 1.54 $ 1.46 $ 1.49 $ 1.29 $ 1.39 $ 1.37 $ 1.22 $ 0.95 $ 5.78 $ 4.92 $ 3.85
From discontinued operation (in US dollars per share) 0 0 0 0 (0.02) (0.01) 0.00 0.00 0 (0.04) (0.01)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 1.54 1.46 1.49 1.29 1.37 1.36 1.22 0.95 5.78 4.88 3.84
Diluted earnings (loss) per common share:                      
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 1.54 1.45 1.49 1.28 1.38 1.36 1.21 0.94 5.75 4.89 3.83
From discontinued operation (in US dollars per share) 0 0 0 0 (0.02) (0.01) 0.00 0.00 0 (0.04) (0.01)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 1.54 $ 1.45 $ 1.49 $ 1.28 $ 1.36 $ 1.35 $ 1.21 $ 0.94 $ 5.75 $ 4.85 $ 3.82