Significant Accounting Policies Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles
Net cash provided by (used for) operating activities	$ (354,138)	$ (497,095)
Accounting Standard Update 2016-18
New Accounting Pronouncements and Changes in Accounting Principles
Net cash provided by (used for) operating activities		$ 2,631,000
Transamerican Auto Parts | Vehicles And Boats | Minimum
Product Warranty Liability [Line Items]
Period of warranties provided by Polaris	6 months
Transamerican Auto Parts | Vehicles And Boats | Maximum
Product Warranty Liability [Line Items]
Period of warranties provided by Polaris	10 years
Transamerican Auto Parts | Off Road Vehicle | Minimum
Product Warranty Liability [Line Items]
Period of warranties provided by Polaris	2 years
Transamerican Auto Parts | Off Road Vehicle | Maximum
Product Warranty Liability [Line Items]
Period of warranties provided by Polaris	5 years