Finance Receivables (Aging Of Past Due Finance Receivables Including Non Accrual Status Finance Receivables) (Detail) - USD ($) $ in Thousands	Sep. 25, 2016	Dec. 31, 2015	Sep. 27, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 193,757	$ 196,963	$ 170,128
Total finance receivables	7,321,482	7,015,331	7,223,729
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, current	7,127,725	6,818,368	7,053,601
31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	120,075	119,884	111,499
61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	41,980	44,210	34,673
Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	31,702	32,869	23,956
Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	192,891	195,468	169,712
Total finance receivables	6,165,999	5,991,471	6,194,332
Retail | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, current	5,973,108	5,796,003	6,024,620
Retail | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	119,709	118,996	111,393
Retail | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	41,866	43,680	34,511
Retail | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	31,316	32,792	23,808
Wholesale
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	866	1,495	416
Total finance receivables	1,155,483	1,023,860	1,029,397
Wholesale | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, current	1,154,617	1,022,365	1,028,981
Wholesale | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	366	888	106
Wholesale | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	114	530	162
Wholesale | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 386	$ 77	$ 148