Significant Accounting Policies Activity in Polaris Accrued Warranty Reserve (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Activity in Product Warranty Reserve [Roll Forward]
Balance at beginning of period	$ 48,634	$ 47,224	$ 53,104	$ 52,818
Additions to warranty reserve through acquisitions	150	110	200	110
Additions charged to expense	14,646	12,270	28,565	23,297
Warranty claims paid	(18,331)	(14,793)	(36,770)	(31,414)
Balance at end of period	$ 45,099	$ 44,811	$ 45,099	$ 44,811