Finance Receivables (Aging Of Past Due Finance Receivables Including Non Accrual Status Finance Receivables) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Apr. 01, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	$ 6,140,731	$ 5,889,519	$ 5,999,906
Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	4,981,488	5,073,115	5,043,584
Finance receivables, gross	4,981,488	5,073,115	5,043,584
Wholesale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	1,159,243	816,404	956,322
Finance receivables, gross	1,159,243	816,404	956,322
Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	6,012,724	5,709,381	5,886,232
Current [Member] | Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	4,855,128	4,894,675	4,930,739
Current [Member] | Wholesale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	1,157,596	814,706	955,493
31-60 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	83,800	114,588	75,914
31-60 Days Past Due [Member] | Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	83,265	113,604	75,560
31-60 Days Past Due [Member] | Wholesale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	535	984	354
61-90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	23,147	37,517	21,172
61-90 Days Past Due [Member] | Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	22,837	37,239	21,023
61-90 Days Past Due [Member] | Wholesale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	310	278	149
Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	21,060	28,033	16,588
Greater Than 90 Days Past Due [Member] | Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	20,258	27,597	16,262
Greater Than 90 Days Past Due [Member] | Wholesale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	802	436	326
Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	128,007	180,138	113,674
Total Past Due [Member] | Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	126,360	178,440	112,845
Total Past Due [Member] | Wholesale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivables, gross	$ 1,647	$ 1,698	$ 829