Document And Entity Information
3 Months Ended
Mar. 31, 2012
May 01, 2012
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2012  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q1  
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   59,110,847