v3.3.1.900
Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2015
Feb. 19, 2016
Jun. 30, 2015
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Trading Symbol GLDD    
Entity Registrant Name Great Lakes Dredge & Dock CORP    
Entity Central Index Key 0001372020    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   60,431,841  
Entity Public Float     $ 330,554,110
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes