Fair Value Of Financial Instruments (Summary Of Fair Value And Carrying Value Of Company Financial Instruments) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Apr. 01, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 1,018,759	$ 1,068,138	$ 1,276,337	$ 1,526,950
Marketable securities	135,246	135,634	134,946
Accounts receivable, net	259,673	230,079	264,272
Restricted Cash and Cash Equivalents	197,025	188,008	246,995
Accounts payable	360,018	257,386	355,902
Derivatives	2,165	7,920	2,234
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,018,759	1,068,138	1,276,337
Marketable securities	135,246	135,634	134,946
Accounts receivable, net	259,673	230,079	264,272
Derivatives	11,737	317	6,345
Finance receivables, net	6,108,934	5,861,442	5,961,825
Restricted Cash and Cash Equivalents	197,025	188,008	246,995
Accounts payable	360,018	257,386	355,902
Derivatives	2,165	7,920	2,234
Unsecured commercial paper	687,705	294,943	662,343
Credit facilities	0	0	150,195
AssetBackedCanadianCommericalPaper	154,596	175,658	0
Medium-term notes	3,169,807	3,199,548	2,936,475
Senior unsecured notes	337,600	338,594	366,651
Term asset-backed securitization debt	1,276,046	1,457,807	1,768,140
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,018,759	1,068,138	1,276,337
Marketable securities	135,246	135,634	134,946
Accounts receivable, net	259,673	230,079	264,272
Derivatives	11,737	317	6,345
Finance receivables, net	6,033,939	5,781,852	5,877,403
Restricted Cash and Cash Equivalents	197,025	188,008	246,995
Accounts payable	360,018	257,386	355,902
Derivatives	2,165	7,920	2,234
Unsecured commercial paper	687,705	294,943	662,343
Credit facilities	0	0	150,195
AssetBackedCanadianCommericalPaper	154,596	175,658	0
Medium-term notes	2,881,444	2,881,272	2,698,232
Senior unsecured notes	303,000	303,000	303,000
Term asset-backed securitization debt	$ 1,268,572	$ 1,447,776	$ 1,754,320

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Finance Receivables Held For Investment Current And Noncurrent

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer).

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for less than one year or the normal operating cycle, whichever is longer.

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Including the current and noncurrent portions, carrying value at the balance sheet date of a financial instrument used to receive debt funding on a regular basis with original maturities ranging from 5-10 years.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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