Finance Receivables (Recorded Investment Of Retail and Wholesale Finance Receivables By Credit Quality Indicator) (Detail) - USD ($) $ in Thousands	Jul. 01, 2018	Dec. 31, 2017	Jun. 25, 2017
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	$ 7,507,132	$ 7,157,557	$ 7,526,063
Retail
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	6,373,926	6,140,600	6,267,211
Retail | Prime
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	5,193,641	4,966,193	5,034,187
Retail | Sub-prime
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	1,180,285	1,174,407	1,233,024
Wholesale
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	1,133,206	1,016,957	1,258,852
Wholesale | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	251	688	5,203
Wholesale | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	803	3,837	10,458
Wholesale | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	2,154	26,866	4,953
Wholesale | Medium Risk
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	37,045	9,917	8,115
Wholesale | Low Risk
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	$ 1,092,953	$ 975,649	$ 1,230,123