Significant Accounting Policies - Activity in Polaris Accrued Warranty Reserve (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Activity in Product Warranty Reserve [Roll Forward]
Balance at beginning of period	$ 42,717	$ 38,685	$ 47,723	$ 44,355
Additions to warranty reserve through acquisitions	0	0	1,602	0
Additions charged to expense	16,860	12,101	38,850	29,140
Warranty claims paid	(11,475)	(9,215)	(40,073)	(31,924)
Balance at end of period	$ 48,102	$ 41,571	$ 48,102	$ 41,571