Document and Entity Information
9 Months Ended
Sep. 30, 2012
Oct. 29, 2012
Document and Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2012  
Entity Registrant Name NAVIGANT CONSULTING INC  
Entity Central Index Key 0001019737  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   51,155,282
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2012  
Trading Symbol nci