Asset-Backed Financing (Servicing Activities) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 24, 2017	Sep. 30, 2018	Sep. 24, 2017	Dec. 31, 2017
Transfers and Servicing [Abstract]
Servicing and ancillary fees			$ 900	$ 1,500
Current unpaid balance - on-balance sheet retail motorcycle finance receivables	$ 6,360,907	$ 6,185,144	6,360,907	6,185,144	$ 5,993,185
Current unpaid balance - off-balance sheet retail motorcycle finance receivables	93,147	165,169	93,147	165,169	146,425
Current unpaid balance - total serviced retail motorcycle finance receivables	6,454,054	6,350,313	6,454,054	6,350,313	6,139,610
Delinquent - on-balance sheet retail motorcycle finance receivables	204,574	203,450	204,574	203,450	227,127
Delinquent - off-balance sheet retail motorcycle finance receivables	1,767	1,720	1,767	1,720	2,106
Delinquent - total serviced retail motorcycle finance receivables	206,341	205,170	206,341	205,170	$ 229,233
Credit losses net of recoveries - on-balance sheet retail motorcycle finance receivables	24,005	27,199	71,478	76,820
Credit losses net of recoveries - off-balance sheet retail motorcycle finance receivables	230	299	729	865
Credit losses net of recoveries - total serviced retail motorcycle finance receivables	$ 24,235	$ 27,498	$ 72,207	$ 77,685

Assets And Any Other Financial Assets Managed Together, Delinquent Amount At End Of Period

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- Definition

Assets Securitized Or Asset-backed Financing Arrangement, Assets And Any Other Financial Assets Managed Together, Net Credit Losses During Period

+ References

No definition available.

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- Definition

Amount of net credit losses charged off.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (e)(5)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107314-111719

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- Definition

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
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- Definition

Amount of contractually specified servicing fee, late fee, and ancillary fee recognized as income for servicing asset and servicing liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (c)
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- Definition

This is the amount of the financial instruments that are considered delinquent (past due) at the end of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (e)(4)
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- Definition

Net credit losses are charge-offs and are based on total loans outstanding during the period.

+ References

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- Definition

Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that have been derecognized. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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This is the amount of the financial instruments that are considered delinquent (past due) at the end of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 4
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Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that continue to be recognized in the statement of financial position. Includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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