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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income attributable to MYR Group Inc.	$ 7,207	$ 6,835	$ 14,560	$ 12,479
Denominator:
Weighted average common shares outstanding (in shares)	16,600	16,455	16,557	16,388
Weighted average dilutive securities (in shares)	104	137	125	167
Weighted average common shares outstanding, diluted (in shares)	16,704	16,592	16,682	16,555
Income per common share attributable to MYR Group Inc.:
Basic (in dollars per share)	$ 0.43	$ 0.42	$ 0.88	$ 0.76
Diluted (in dollars per share)	$ 0.43	$ 0.41	$ 0.87	$ 0.75

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