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Acquisitions - Summary of supplemental pro forma financial information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Contract revenues	$ 1,612,618	$ 1,523,328
Net income	35,872	26,531
Net income attributable to MYR Group, Inc.	$ 34,947	$ 25,561
Income per common share:
— Basic (in dollars per share)	$ 2.13	$ 1.57
— Diluted (in dollars per share)	$ 2.11	$ 1.55
Weighted average number of common shares and potential common shares outstanding:
— Basic (in shares)	16,441	16,273
— Diluted (in shares)	16,585	16,496

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The pro forma net Income or Loss attributable to parent for the period as if the business combination or combinations had been completed at the beginning of a period.

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