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Significant Accounting Policies Activity in Polaris Accrued Warranty Reserve (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Activity in Product Warranty Reserve [Roll Forward]        
Balance at beginning of period $ 45,099 $ 44,811 $ 53,104 $ 52,818
Additions to warranty reserve through acquisitions 0 0 200 110
Additions charged to expense 25,288 21,227 53,853 44,524
Warranty claims paid (15,290) (14,644) (52,060) (46,058)
Balance at end of period $ 55,097 $ 51,394 $ 55,097 $ 51,394