Significant Accounting Policies Activity in Polaris Accrued Warranty Reserve (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Activity in Product Warranty Reserve [Roll Forward]
Balance at beginning of period	$ 47,224	$ 40,941	$ 52,818	$ 47,723
Additions to warranty reserve through acquisitions	110	1,602	110	1,602
Additions charged to expense	12,270	13,154	23,297	21,990
Warranty claims paid	(14,793)	(12,980)	(31,414)	(28,598)
Balance at end of period	$ 44,811	$ 42,717	$ 44,811	$ 42,717