Finance Receivables (Changes In Allowance For Credit Losses On Finance Receivables) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Allowance	$ 106,792	$ 122,503	$ 107,667	$ 125,449
Provision for credit losses	13,110	9,014
Charge-offs	25,243	25,852
Recoveries	11,258	13,892
Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Allowance	98,542	112,857	101,442
Provision for credit losses	11,085	8,705
Balance, beginning of period	101,442	116,112
Charge-offs	25,243	25,852
Recoveries	11,258	13,892
Balance, end of period	98,542	112,857
Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Allowance	8,250	9,646	6,225
Provision for credit losses	2,025	309
Loans and Leases Receivable, Commercial, Allowance	8,250	9,646	6,225	9,337
Charge-offs	0	0
Recoveries	$ 0	$ 0