Organization and Significant Accounting Policies - Activity in Polaris Accrued Warranty Reserve (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Activity in Product Warranty Reserve [Roll Forward]
Balance at beginning of year	$ 121,824	$ 123,840	$ 119,274
Additions to reserve related to acquisitions	8,809	19,468	0
Additions charged to expense	122,909	105,015	145,705
Warranty claims paid, net	117,358	126,499	(141,139)
Balance at end of year	$ 136,184	$ 121,824	$ 123,840