Asset-Backed Financing (Servicing Activities) (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 01, 2018	Jun. 25, 2017	Jul. 01, 2018	Jun. 25, 2017	Dec. 31, 2017
Transfers and Servicing [Abstract]
Servicing and ancillary fees			$ 700	$ 1,100
Current unpaid balance - on-balance sheet retail motorcycle finance receivables	$ 6,227,634	$ 6,121,372	6,227,634	6,121,372	$ 5,993,185
Current unpaid balance - off-balance sheet retail motorcycle finance receivables	109,578	187,769	109,578	187,769	146,425
Current unpaid balance - total serviced retail motorcycle finance receivables	6,337,212	6,309,141	6,337,212	6,309,141	6,139,610
Delinquent - on-balance sheet retail motorcycle finance receivables	175,020	180,619	175,020	180,619	227,127
Delinquent - off-balance sheet retail motorcycle finance receivables	1,591	1,659	1,591	1,659	2,106
Delinquent - total serviced retail motorcycle finance receivables	176,611	182,278	176,611	182,278	$ 229,233
Credit losses net of recoveries - on-balance sheet retail motorcycle finance receivables	15,300	16,719	47,473	49,621
Credit losses net of recoveries - off-balance sheet retail motorcycle finance receivables	137	152	498	566
Credit losses net of recoveries - total serviced retail motorcycle finance receivables	$ 15,437	$ 16,871	$ 47,971	$ 50,187

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)
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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
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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
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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

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

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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
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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

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-Publisher FASB
-Name Accounting Standards Codification
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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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