Asset-Backed Financing (Servicing Activities) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 25, 2016	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015	Dec. 31, 2015
Transfers and Servicing [Abstract]
Servicing and ancillary fees			$ 1,000
Current unpaid balance - on-balance sheet retail motorcycle finance receivables	$ 6,017,065	$ 6,039,011	6,017,065	$ 6,039,011	$ 5,843,352
Current unpaid balance - off-balance sheet retail motorcycle finance receivables	262,583	0	262,583	0	0
Current unpaid balance - total serviced retail motorcycle finance receivables	6,279,648	6,039,011	6,279,648	6,039,011	5,843,352
Delinquent - on-balance sheet retail motorcycle finance receivables	192,891	169,712	192,891	169,712	195,468
Delinquent - off-balance sheet retail motorcycle finance receivables	1,235	0	1,235	0	0
Delinquent - total serviced retail motorcycle finance receivables	194,126	169,712	194,126	169,712	$ 195,468
Credit losses net of recoveries - on-balance sheet retail motorcycle finance receivables	26,380	21,081	69,498	50,636
Credit losses net of recoveries - off-balance sheet retail motorcycle finance receivables	270	0	285	0
Credit losses net of recoveries - total serviced retail motorcycle finance receivables	$ 26,650	$ 21,081	$ 69,783	$ 50,636

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=64830801&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
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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
-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.

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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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-Name Accounting Standards Codification
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+ 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
-Name Accounting Standards Codification
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