XML 10 R1.htm IDEA: XBRL DOCUMENT v3.25.2
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2025
Aug. 01, 2025
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Trading Symbol GLDD  
Entity Registrant Name Great Lakes Dredge & Dock Corporation  
Entity Central Index Key 0001372020  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Shell Company false  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Address, Address Line One 9811 Katy Freeway  
Entity Address, Address Line Two Suite 1200  
Entity Address, City or Town Houston  
Entity Address, State or Province TX  
Entity Common Stock, Shares Outstanding   67,995,301
Entity Current Reporting Status Yes  
Entity File Number 001-33225  
Entity Tax Identification Number 20-5336063  
City Area Code 346  
Local Phone Number 359-1010  
Entity Address, Postal Zip Code 77024  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common Stock (Par Value $0.0001)  
Security Exchange Name NASDAQ  
Entity Incorporation, State or Country Code DE  
Document Quarterly Report true  
Document Transition Report false