v3.7.0.1
Document And Entity Information - shares
6 Months Ended
Jun. 30, 2017
Jul. 28, 2017
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q2  
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   61,405,170