Finance Receivables (Aging Of Past Due Finance Receivables Including Non Accrual Status Finance Receivables) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 25, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	$ 6,028,793	$ 5,912,130	$ 6,038,447
Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	5,243,470	5,087,490	5,321,403
Wholesale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	785,323	824,640	717,044
Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	5,877,651	5,738,321	5,863,944
Current [Member] | Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	5,093,496	4,915,711	5,148,199
Current [Member] | Wholesale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	784,155	822,610	715,745
31-60 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	101,151	108,150	112,878
31-60 Days Past Due [Member] | Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	100,706	107,373	112,370
31-60 Days Past Due [Member] | Wholesale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	445	777	508
61-90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	30,095	37,281	37,688
61-90 Days Past Due [Member] | Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	29,878	36,937	37,491
61-90 Days Past Due [Member] | Wholesale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	217	344	197
Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	19,896	28,378	23,937
Greater Than 90 Days Past Due [Member] | Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	19,390	27,469	23,343
Greater Than 90 Days Past Due [Member] | Wholesale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	506	909	594
Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	151,142	173,809	174,503
Total Past Due [Member] | Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	149,974	171,779	173,204
Total Past Due [Member] | Wholesale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	$ 1,168	$ 2,030	$ 1,299