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Financing Receivables and Payables - Additional Information (Detail) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Financing Receivables [Line Items]    
Other liabilities $ 315,581,000 $ 277,970,000
Financing Receivable
   
Financing Receivables [Line Items]    
Other current assets 186,800,000 198,500,000
Financing Payables
   
Financing Receivables [Line Items]    
Other liabilities $ 163,400,000 $ 165,300,000