Asset-Backed Financing (Servicing Activities) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 24, 2017	Sep. 25, 2016	Sep. 24, 2017	Sep. 25, 2016	Dec. 31, 2016
Transfers and Servicing [Abstract]
Servicing and ancillary fees			$ 1,500	$ 1,000
Current unpaid balance - on-balance sheet retail motorcycle finance receivables	$ 6,185,144	$ 6,017,065	6,185,144	6,017,065	$ 5,839,467
Current unpaid balance - off-balance sheet retail motorcycle finance receivables	165,169	262,583	165,169	262,583	236,706
Current unpaid balance - total serviced retail motorcycle finance receivables	6,350,313	6,279,648	6,350,313	6,279,648	6,076,173
Delinquent - on-balance sheet retail motorcycle finance receivables	203,450	192,891	203,450	192,891	221,393
Delinquent - off-balance sheet retail motorcycle finance receivables	1,720	1,235	1,720	1,235	1,858
Delinquent - total serviced retail motorcycle finance receivables	205,170	194,126	205,170	194,126	$ 223,251
Credit losses net of recoveries - on-balance sheet retail motorcycle finance receivables	27,199	26,380	76,820	69,498
Credit losses net of recoveries - off-balance sheet retail motorcycle finance receivables	299	270	865	285
Credit losses net of recoveries - total serviced retail motorcycle finance receivables	$ 27,498	$ 26,650	$ 77,685	$ 69,783

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
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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
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-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
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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
-Publisher FASB
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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
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