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Organization and Summary of Significant Accounting Policies (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
item
Dec. 31, 2011
Dec. 31, 2010
Contracts in Transit      
Contracts in transit, included in accounts receivable $ 235,699 $ 183,548  
Impairment Testing      
Number of reportable Segments 2    
Number of reporting unit's fair value is less than their carrying amount 4    
Investments      
Net book value of investments 303,160 298,640  
Finance and Insurance Sales      
Aggregate reserves relating to chargeback activity 23,437 21,037  
Defined Contribution Plans      
Expense incurred relating to defined contribution plans 13,690 11,847 9,426
Advertising      
Net advertising costs 81,859 70,526 64,968
Reimbursement of advertising expense 11,781 10,067 8,671
Self Insurance      
Aggregate reserves relating to retained risk $ 20,129 $ 25,884  
Earnings Per Share      
Weighted average number of common shares outstanding 90,318 91,154 92,018
Effect of non-participatory equity compensation (in shares) 24 120 73
Weighted average number of common shares outstanding, including effect of dilutive securities 90,342 91,274 92,091