Asset-Backed Financing (Servicing Activities) (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016	Dec. 31, 2016
Transfers and Servicing [Abstract]
Servicing and ancillary fees			$ 1,100	$ 300
Current unpaid balance - on-balance sheet retail motorcycle finance receivables	$ 6,121,372	$ 5,872,668	6,121,372	5,872,668	$ 5,839,467
Current unpaid balance - off-balance sheet retail motorcycle finance receivables	187,769	292,176	187,769	292,176	236,706
Current unpaid balance - total serviced retail motorcycle finance receivables	6,309,141	6,164,844	6,309,141	6,164,844	6,076,173
Delinquent - on-balance sheet retail motorcycle finance receivables	180,619	168,091	180,619	168,091	221,393
Delinquent - off-balance sheet retail motorcycle finance receivables	1,659	460	1,659	460	1,858
Delinquent - total serviced retail motorcycle finance receivables	182,278	168,551	182,278	168,551	$ 223,251
Credit losses net of recoveries - on-balance sheet retail motorcycle finance receivables	16,719	15,001	49,621	43,118
Credit losses net of recoveries - off-balance sheet retail motorcycle finance receivables	152	15	566	15
Credit losses net of recoveries - total serviced retail motorcycle finance receivables	$ 16,871	$ 15,016	$ 50,187	$ 43,133

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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- Definition

The total amount of contractually specified servicing fees, late fees, and ancillary fees earned for each period for which results of operations are presented.

+ References

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