Reportable Segments and Geographic Information - Information By Strategic Business Units (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	2
Segment Reporting Information [Line Items]
Selling, administrative and engineering expense	$ 1,050,627	$ 1,199,056	$ 1,258,098
Restructuring expense	130,009	32,353	93,401
Operating income	9,679	555,608	713,523
Financial Services expense	4,044,698	4,806,181	5,003,352
Motorcycles
Segment Reporting Information [Line Items]
Motorcycles revenue	3,264,054	4,572,678	4,968,646
Gross profit	828,309	1,342,880	1,616,850
Selling, administrative and engineering expense	895,321	1,020,907	1,101,086
Restructuring expense	119,110	32,353	93,401
Operating income	(186,122)	289,620	422,363
Financial Services
Segment Reporting Information [Line Items]
Restructuring expense	10,899	0	0
Operating income	195,801	265,988	291,160
Financial Services revenue	790,323	789,111	748,229
Financial Services expense	583,623	523,123	457,069
Financial Services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Financial Services revenue	$ 6,100	$ 10,000	$ 9,000