Cover Page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Feb. 26, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Current Fiscal Year End Date	--12-31
Document Period End Date	Dec. 31, 2020
Document Transition Report	false
Entity File Number	1-08325
Entity Registrant Name	MYR GROUP INC.
Entity Incorporation, State or Country Code	DE
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
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	MYRG
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 380.7
Entity Common Stock, Shares Outstanding		16,788,372
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission (the “SEC”) in connection with its 2021 annual meeting of stockholders expected to be held on April 22, 2021, are incorporated into Part III hereof.
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0000700923