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Earnings Per Share - Summary of weighted average number of common shares used to compute basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income attributable to MYR Group Inc.	$ 9,932	$ 7,353
Denominator:
Weighted average common shares outstanding (in shares)	16,627	16,514
Weighted average dilutive securities (in shares)	115	144
Weighted average common shares outstanding, diluted (in shares)	16,742	16,658
Income per common share attributable to MYR Group Inc.:
Basic (in dollars per share)	$ 0.60	$ 0.45
Diluted (in dollars per share)	$ 0.59	$ 0.44

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