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Finance Receivables (Recorded Investment Of Retail Finance Receivables By Credit Quality Indicator) (Detail) (Retail [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Apr. 01, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables, gross $ 4,981,488 $ 5,073,115 $ 5,043,584
Prime [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables, gross 3,942,294 4,035,584 4,056,602
Sub-Prime [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables, gross $ 1,039,194 $ 1,037,531 $ 986,982