| Cover Page | Apr. 28, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Apr. 28, 2021 |
| Entity Registrant Name | MYR GROUP INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-08325 |
| Entity Tax Identification Number | 36-3158643 |
| Entity Address, Address Line One | 12150 East 112th Avenue |
| Entity Address, City or Town | Henderson, |
| Entity Address, State or Province | CO |
| Entity Address, Postal Zip Code | 80640 |
| City Area Code | 303 |
| Local Phone Number | 286-8000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Trading Symbol | MYRG |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0000700923 |
