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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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