v2.4.0.6
Document And Entity Information
3 Months Ended
Mar. 31, 2013
May 03, 2013
Common Class A [Member]
May 03, 2013
Common Class B [Member]
Entity Registrant Name RUSH ENTERPRISES INC \TX\    
Document Type 10-Q    
Current Fiscal Year End Date --12-31    
Entity Common Stock, Shares Outstanding   28,651,968 10,818,478
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 Mar. 31, 2013    
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus Q1