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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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