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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 | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Contract revenues | $ 596,600 | $ 474,783 | $ 1,672,149 | $ 1,277,341
Net income | 10,743 | 5,602 | 26,515 | 18,940
Net income attributable to MYR Group, Inc. | $ 10,637 | $ 5,600 | $ 27,991 | $ 18,938
Income per common share attributable to MYR Group Inc.: |  |  |  |
- Basic (in dollars per share) | $ 0.64 | $ 0.34 | $ 1.69 | $ 1.15
- Diluted (in dollars per share) | $ 0.64 | $ 0.34 | $ 1.68 | $ 1.14
Weighted average number of common shares and potential common shares outstanding: |  |  |  |
- Basic (in shares) | 16,614 | 16,492 | 16,576 | 16,423
- Diluted (in shares) | 16,714 | 16,630 | 16,692 | 16,580

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