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Commitments and Contingencies - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Loss Contingencies [Line Items]    
Material reserves for litigation $ 0 $ 0
Purchase price of receivable portfolios   1,000,000,000
Purchase price 148,600,000 $ 148,600,000
Consent order, Consumer Finance Protection Bureau [Member]    
Loss Contingencies [Line Items]    
Settlement of allegations, expense $ 43,000,000