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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, 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
Selected Quarterly Financial Information [Abstract]                      
Revenues (in US dollars) $ 2,403,940 $ 2,287,741 $ 2,324,202 $ 2,158,728 $ 2,229,308 $ 2,047,049 $ 1,953,886 $ 1,900,388 $ 9,174,611 $ 8,130,631 $ 7,686,999
Gross profit (in US dollars) 364,747 335,987 346,380 308,754 336,151 309,339 290,844 269,119 1,355,868 1,205,453 1,147,012
Impairment loss on goodwill and identifiable intangible assets         0 0 907 0 0 907 57,819
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
Basic earnings (loss) per common share:                      
Basic EPS from continuing operations (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
Basic EPS 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:                      
Diluted EPS from continuing operations (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
Diluted EPS 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