Finance Receivables (Aging Of Past Due Finance Receivables Including Non Accrual Status Finance Receivables) (Detail) - USD ($) $ in Thousands	Jun. 25, 2017	Dec. 31, 2016	Jun. 26, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 182,170	$ 222,988	$ 168,893
Total finance receivables	7,526,063	7,008,801	7,443,398
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, current	7,343,893	6,785,813	7,274,505
31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	118,897	132,302	108,649
61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	37,056	49,961	38,114
Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	26,217	40,725	22,130
Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	180,619	221,393	168,091
Total finance receivables	6,267,211	5,982,211	6,020,750
Retail | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, current	6,086,592	5,760,818	5,852,659
Retail | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	118,616	131,302	108,192
Retail | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	36,914	49,642	37,961
Retail | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	25,089	40,449	21,938
Wholesale
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,551	1,595	802
Total finance receivables	1,258,852	1,026,590	1,422,648
Wholesale | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, current	1,257,301	1,024,995	1,421,846
Wholesale | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	281	1,000	457
Wholesale | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	142	319	153
Wholesale | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 1,128	$ 276	$ 192