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Finance Receivables (Recorded Investment Of Wholesale Finance Receivables By Internal Credit Quality Indicator) (Detail) (Wholesale [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 $ 1,159,243 $ 816,404 $ 956,322
Doubtful [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables, gross 4,843 8,107 13,108
Substandard [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables, gross 10,441 2,593 5,599
Special Mention [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables, gross 11,125 3,504 8,618
Medium [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables, gross 7,804 8,451 6,365
Low [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables, gross $ 1,125,030 $ 793,749 $ 922,632