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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Selected Quarterly Financial Information [Abstract]                      
Revenues (in US dollars) $ 2,012,639 $ 1,886,691 $ 1,895,937 $ 1,891,732 $ 1,949,964 $ 1,923,174 $ 1,933,416 $ 1,744,970 $ 7,686,999 $ 7,551,524 $ 6,718,726
Gross profit (in US dollars) 311,101 295,070 274,501 266,340 271,969 268,044 274,741 223,108 1,147,012 1,037,862 944,479
Impairment loss on goodwill and identifiable intangible assets 57,819 0 0 0 2,428 0 0 0 57,819 2,428 0
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 53,201 $ 64,597 $ 56,758 $ 52,640 $ 40,676 $ 51,531 $ 55,380 $ 34,348 $ 227,196 $ 181,935 $ 172,286
Basic earnings (loss) per common share:                      
Basic EPS from continuing operations (in US dollars per share) $ 0.91 $ 1.10 $ 0.96 $ 0.89 $ 0.70 $ 0.85 $ 0.93 $ 0.57 $ 3.85 $ 3.05 $ 2.74
Basic EPS from discontinued operation (in US dollars per share) 0.00 0.00 0.00 (0.01) (0.03) (0.01) (0.02) 0.00 (0.01) (0.05) 0.00
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 0.91 1.10 0.96 0.88 0.67 0.84 0.91 0.57 3.84 3.00 2.74
Diluted earnings (loss) per common share:                      
Diluted EPS from continuing operations (in US dollars per share) 0.90 1.09 0.95 0.88 0.69 0.85 0.92 0.56 3.83 3.02 2.72
Diluted EPS from discontinued operation (in US dollars per share) 0.00 0.00 0.00 (0.01) (0.03) (0.01) (0.02) 0.00 (0.01) (0.05) 0.00
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 0.90 $ 1.09 $ 0.95 $ 0.87 $ 0.66 $ 0.84 $ 0.90 $ 0.56 $ 3.82 $ 2.97 $ 2.72