v2.4.0.6
Document and Entity Information (USD $)
9 Months Ended
Sep. 30, 2011
Jun. 30, 2010
Nov. 03, 2011
Common Class A
Nov. 03, 2011
Common Class B
Entity Registrant Name RUSH ENTERPRISES INC \TX\      
Entity Central Index Key 0001012019      
Document Type 10-Q      
Document Period End Date Sep. 30, 2011      
Amendment Flag false      
Document Fiscal Year Focus 2011      
Document Fiscal Period Focus Q3      
Current Fiscal Year End Date --12-31      
Entity Well-known Seasoned Issuer No      
Entity Voluntary Filers No      
Entity Current Reporting Status Yes      
Entity Filer Category Accelerated Filer      
Entity Public Float   $ 429,864,022    
Entity Common Stock, Shares Outstanding     27,242,349 10,727,073