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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator        
Income from continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars) $ 79,896 $ 64,804 $ 206,573 $ 174,724
Loss from discontinued operation, net of income taxes (in US dollars) (523) (207) (1,010) (729)
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 79,373 $ 64,597 $ 205,563 $ 173,995
Denominator        
Weighted average shares outstanding used to compute basic earnings (loss) per common share (in shares) 58,208,203 59,061,768 58,422,928 59,371,672
Effect of dilutive securities-Share-based awards (in shares) 333,107 357,432 331,939 349,513
Shares used to compute diluted earnings (loss) per common share (in shares) 58,541,310 59,419,200 58,754,867 59,721,185
Basic earnings (loss) per common share:        
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 1.37 $ 1.10 $ 3.54 $ 2.94
From discontinued operation (in US dollars per share) (0.01) 0.00 (0.02) (0.01)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 1.36 1.10 3.52 2.93
Diluted earnings (loss) per common share:        
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 1.36 1.09 3.52 2.93
From discontinued operation (in US dollars per share) (0.01) 0.00 (0.02) (0.01)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 1.35 $ 1.09 $ 3.50 $ 2.92
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive share-based awards excluded from calculation of diluted earnings per share (in shares) 0 500 550 500