Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Reconciliation of Residual Assets (Detail)

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Fair Value Measurements - Schedule of Reconciliation of Residual Assets (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unrealized (loss) gain on residual assets $ (68,000) $ (258,000) $ (114,000) $ (340,000)
Residual Assets [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance, beginning of period 5,100,000 4,400,000 4,900,000 4,600,000
Accretion 200,000 200,000 300,000 400,000
Additions     700,000  
Collections (200,000) (100,000) (800,000) (500,000)
Unrealized (loss) gain on residual assets (100,000) (300,000) (100,000) (300,000)
Balance, end of period $ 5,000,000 $ 4,200,000 $ 5,000,000 $ 4,200,000