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Finance Receivables - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Financing Receivables [Line Items]    
Other current assets $ 205,342 $ 213,748
Other liabilities 282,974 254,924
Financing Receivable
   
Financing Receivables [Line Items]    
Other current assets 125,100 124,500
Financing Payables
   
Financing Receivables [Line Items]    
Other liabilities $ 146,100 $ 130,100