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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator        
Income from continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars) $ 56,477 $ 46,963 $ 90,906 $ 80,167
Loss from discontinued operation, net of income taxes (in US dollars) (1,097) (114) (1,178) (469)
Net income attributable to EMCOR Group, Inc. (in US dollars) $ 55,380 $ 46,849 $ 89,728 $ 79,698
Denominator        
Weighted average shares outstanding used to compute basic earnings (loss) per common share (in shares) 60,808,502 62,809,699 60,854,781 62,932,295
Effect of dilutive securities-Share-based awards (in shares) 395,719 520,554 421,497 536,327
Shares used to compute diluted earnings (loss) per common share (in shares) 61,204,221 63,330,253 61,276,278 63,468,622
Basic earnings (loss) per common share:        
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 0.93 $ 0.75 $ 1.49 $ 1.27
From discontinued operation (in US dollars per share) (0.02) 0.00 (0.02) (0.01)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 0.91 0.75 1.47 1.26
Diluted earnings (loss) per common share:        
From continuing operations attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) 0.92 0.74 1.48 1.26
From discontinued operation (in US dollars per share) (0.02) 0.00 (0.02) (0.01)
Net income attributable to EMCOR Group, Inc. common stockholders (in US dollars per share) $ 0.90 $ 0.74 $ 1.46 $ 1.25
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive restricted stock units excluded from calculation of diluted earnings per share (in shares) 0 0 0 35,625