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Selected Unaudited Quarterly Information - Schedule of Quarterly Financial Information (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
Selected Quarterly Financial Information [Abstract]                      
Revenues (in US dollars) $ 2,281,494 $ 2,201,714 $ 2,014,021 $ 2,299,832 $ 2,403,940 $ 2,287,741 $ 2,324,202 $ 2,158,728 $ 8,797,061 $ 9,174,611 $ 8,130,631
Gross profit (in US dollars) 383,851 363,184 315,286 333,061 364,747 335,987 346,380 308,754 1,395,382 1,355,868 1,205,453
Impairment loss on goodwill, identifiable intangible assets, and other long-lived assets 0 0 232,750 0         232,750 0 907
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
Basic earnings (loss) per common share:                      
Basic EPS from continuing operations (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
Basic EPS 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:                      
Diluted EPS from continuing operations (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
Diluted EPS 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