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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator                      
Income from continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars)                 $ 132,943 $ 325,140 $ 285,876
Loss from discontinued operation, net of income taxes (in US dollars)                 0 0 (2,345)
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 79,781 $ 61,186 $ (83,689) $ 75,665 $ 86,924 $ 81,834 $ 83,972 $ 72,410 $ 132,943 $ 325,140 $ 283,531
Denominator                      
Weighted average shares outstanding used to compute basic earnings (loss) per common share (in shares)                 55,196,173 56,208,280 58,112,838
Effect of dilutive securities-Share-based awards (in shares)                 225,098 311,001 330,629
Shares used to compute diluted earnings (loss) per common share (in shares)                 55,421,271 56,519,281 58,443,467
Basic earnings (loss) per common share:                      
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 1.45 $ 1.11 $ (1.52) $ 1.35 $ 1.54 $ 1.46 $ 1.49 $ 1.29 $ 2.41 $ 5.78 $ 4.92
From discontinued operation (in US dollars per share)                 0 0 (0.04)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)                 2.41 5.78 4.88
Diluted earnings (loss) per common share:                      
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 1.45 $ 1.11 $ (1.52) $ 1.35 $ 1.54 $ 1.45 $ 1.49 $ 1.28 2.40 5.75 4.89
From discontinued operation (in US dollars per share)                 0 0 (0.04)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share)                 $ 2.40 $ 5.75 $ 4.85