Annual report pursuant to Section 13 and 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 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Sep. 30, 2012
Sep. 30, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unrealized (loss) gain on residual assets $ 19 $ (159) $ 217 $ (79)
Residual Assets [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance, beginning of period   4,638 4,531  
Accretion   473 503  
Additions (reclassifications)   390 (22)  
Collections   (479) (631)  
Unrealized (loss) gain on residual assets   (159) 216  
Balance, end of period   $ 4,863 $ 4,597