Finance Receivables (Recorded Investment Of Retail and Wholesale Finance Receivables By Credit Quality Indicator) (Detail) - USD ($) $ in Thousands	Sep. 24, 2017	Dec. 31, 2016	Sep. 25, 2016
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	$ 7,296,607	$ 7,008,801	$ 7,321,482
Retail
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	6,336,447	5,982,211	6,165,999
Retail | Prime
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	5,107,718	4,768,420	4,900,752
Retail | Sub-prime
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	1,228,729	1,213,791	1,265,247
Wholesale
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	960,160	1,026,590	1,155,483
Wholesale | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	4,666	1,333	0
Wholesale | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	8,724	1,773	16,244
Wholesale | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	5,261	30,152	0
Wholesale | Medium Risk
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	4,987	14,620	7,667
Wholesale | Low Risk
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	$ 936,522	$ 978,712	$ 1,131,572