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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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