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Significant Accounting Policies Activity in Polaris Accrued Warranty Reserve (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Activity in Product Warranty Reserve [Roll Forward]    
Balance at beginning of period $ 52,818 $ 47,723
Additions charged to expense 11,027 8,836
Warranty claims paid (16,621) (15,618)
Balance at end of period $ 47,224 $ 40,941