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 $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unrealized (loss) gain on residual assets $ (33) $ 127 $ (46) $ (82)
Residual Assets [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance, beginning of period 4,490 4,436 4,863 4,639
Accretion 135 118 284 246
Additions 661 10 661 10
Collections (115) (249) (624) (371)
Unrealized (loss) gain on residual assets (33) 127 (46) (82)
Balance, end of period $ 5,138 $ 4,442 $ 5,138 $ 4,442