Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2026	Apr. 28, 2026
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Securities Act File Number	1-33891
Entity Registrant Name	ORION GROUP HOLDINGS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	26-0097459
Entity Address, Address Line One	2940 Riverby Road
Entity Address, Address Line Two	Suite 400
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77020
City Area Code	713
Local Phone Number	852-6500
Title of 12(b) Security	Common stock, $0.01 par value per share
Trading Symbol	ORN
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		40,479,278
Entity Central Index Key	0001402829
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Amendment Flag	false