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Acquisitions - Summary of supplemental pro forma financial information (Details) - CSI Electrical Contractors, Inc [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |
Contract revenues | $ 2,243,224 | $ 1,833,645
Net income | 39,552 | 33,165
Net income attributable to MYR Group, Inc. | $ 41,028 | $ 32,958
Income per common share attributable to MYR Group Inc.: |  |
- Basic (in dollars per share) | $ 2.47 | $ 2.00
- Diluted (in dollars per share) | $ 2.46 | $ 1.99
Weighted average number of common shares and potential common shares outstanding: |  |
- Basic (in shares) | 16,587 | 16,441
- Diluted (in shares) | 16,699 | 16,585

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