Significant Accounting Policies - Activity in Polaris Accrued Warranty Reserve (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Activity in Product Warranty Reserve [Roll Forward]
Balance at beginning of period	$ 40,941	$ 40,430	$ 47,723	$ 44,355
Additions to warranty reserve through acquisitions	1,602	0	1,602	0
Additions charged to expense	13,154	8,647	21,990	17,039
Warranty claims paid	(12,980)	(10,392)	(28,598)	(22,709)
Balance at end of period	$ 42,717	$ 38,685	$ 42,717	$ 38,685