Asset-Backed Financing (Servicing Activities) (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Transfers and Servicing [Abstract]
Current unpaid balance - total serviced retail motorcycle finance receivables	$ 6,185,350	$ 5,993,185
Current unpaid balance - off-balance sheet retail motorcycle finance receivables	79,613	146,425
Current unpaid balance - on-balance sheet retail motorcycle finance receivables	6,264,963	6,139,610
Delinquent - on-balance sheet retail motorcycle finance receivables	228,015	227,127
Delinquent - off-balance sheet retail motorcycle finance receivables	1,658	2,106
Delinquent - total serviced retail motorcycle finance receivables	229,673	229,233
Credit losses net of recoveries - on-balance sheet retail motorcycle finance receivables	109,448	113,316
Credit losses net of recoveries - off-balance sheet retail motorcycle finance receivables	907	1,191
Credit losses net of recoveries - total serviced retail motorcycle finance receivables	$ 110,355	$ 114,507

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.

+ Details

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- Definition

Amount of net credit losses charged off.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (e)(5)
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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Section 50
-Paragraph 4
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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
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- Definition

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 20
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- References

No definition available.

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