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Financial Services Arrangements - Additional Information (Detail) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Investments in and Advances to Affiliates [Line Items]    
Amount financed for dealers under the arrangement, net $ 602,842,000  
Aggregate repurchase obligation, amount 78,905,000  
Maximum
   
Investments in and Advances to Affiliates [Line Items]    
Aggregate repurchase obligation, percentage 15.00%  
Finance
   
Investments in and Advances to Affiliates [Line Items]    
Investments in finance affiliate 44,221,000 42,251,000
Polaris Acceptance
   
Investments in and Advances to Affiliates [Line Items]    
Equity method investment ownership percentage 50.00%  
Amount financed for dealers under the arrangement, net 109,069,000  
Securitized Receivables
   
Investments in and Advances to Affiliates [Line Items]    
Amount financed for dealers under the arrangement, net $ 493,773,000  
Equity cash investment as a percentage of the sum of portfolio balance and securitized receivables 15.00%