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Earnings Per Share - Summary of weighted average number of common shares used to compute basic and dilute earnings per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
 [1]
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
 [1]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator:                      
Net income                 $ 31,294 $ 21,154 $ 21,431
Less: net income – noncontrolling interests                 207 0 0
Net income attributable to MYR Group Inc. $ 10,651 $ 7,957 $ 6,835 $ 5,644 $ 13,579 $ 5,145 $ 1,230 $ 1,200 $ 31,087 $ 21,154 $ 21,431
Denominator:                      
Weighted average common shares outstanding                 16,441 16,273 17,109
Weighted average dilutive securities                 144 223 352
Weighted average common shares outstanding, diluted                 16,585 16,496 17,461
Net income per share attributable to MYR Group Inc.:                      
Basic $ 0.65 $ 0.48 $ 0.42 $ 0.35 $ 0.83 $ 0.32 $ 0.08 $ 0.07 $ 1.89 $ 1.30 $ 1.25
Diluted $ 0.64 $ 0.48 $ 0.41 $ 0.34 $ 0.82 $ 0.31 $ 0.07 $ 0.07 $ 1.87 $ 1.28 $ 1.23
[1] Results for the fourth quarter of 2017 include a net 2017 Tax Act benefit of $7.8 million, or $0.48 and $0.47 per basic and diluted share, respectively.