v2.4.0.8
Document And Entity Information
9 Months Ended
Sep. 30, 2013
Nov. 01, 2013
Common Class A [Member]
Nov. 01, 2013
Common Class B [Member]
Document Information [Line Items]      
Entity Registrant Name RUSH ENTERPRISES INC \TX\    
Document Type 10-Q    
Current Fiscal Year End Date --12-31    
Entity Common Stock, Shares Outstanding   28,859,520 10,541,071
Amendment Flag false    
Entity Central Index Key 0001012019    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date Sep. 30, 2013    
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus Q3