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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

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