v3.26.1
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Jul. 28, 2026
Entity Listings [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 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  
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   40,495,290
Entity Central Index Key 0001402829  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false  
The New York Stock Exchange    
Entity Listings [Line Items]    
Security Exchange Name NYSE  
NYSE Texas    
Entity Listings [Line Items]    
Security Exchange Name NYSETX