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Cover
Oct. 24, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 24, 2025
Entity File Number 001-33225
Entity Registrant Name Great Lakes Dredge & Dock Corporation
Entity Central Index Key 0001372020
Entity Tax Identification Number 20-5336063
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 9811 Katy Freeway, Suite 1200
Entity Address, City or Town Houston
Entity Address, State or Province TX
Entity Address, Postal Zip Code 77024
City Area Code 346
Local Phone Number 359-1010
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock (Par Value $0.0001)
Trading Symbol GLDD
Security Exchange Name NASDAQ
Entity Emerging Growth Company false