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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 17, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
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    
ICFR Auditor Attestation Flag true    
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 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 Annual Report true    
Document Transition Report false    
Entity Common Stock, Shares Outstanding   67,282,528  
Entity Public Float     $ 572,246,283
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Document Financial Statement Error Correction [Flag] false    
Auditor Firm ID 34    
Auditor Name Deloitte & Touche LLP    
Auditor Location Chicago, Illinois    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

 

Part of 10-K

Documents Incorporated by Reference

Part III

Portions of the Proxy Statement to be filed with the Securities and Exchange Commission in connection with the 2025 Annual Meeting of Stockholders.
   
Auditor Opinion [Text Block]

We have audited the accompanying consolidated balance sheets of Great Lakes Dredge & Dock Corporation and subsidiaries (the “Company”) as of December 31, 2024 and December 31, 2023, the related consolidated statements of operations, comprehensive income (loss), equity, and cash flows, for each of the three years in the period ended December 31, 2024, and the related notes and the schedule listed in the Index at Item 15 (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and December 31, 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 20, 2025, expressed an unqualified opinion on the Company's internal control over financial reporting.