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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]        
Balance, beginning of period $ 4,442 $ 4,667 $ 4,639 $ 4,871
Accretion 112 171 358 396
Additions (reclassifications)    (29) 10   
Collections (76) (129) (447) (630)
Unrealized loss on residual assets (258) (83) (340) (40)
Balance, end of period $ 4,220 $ 4,597 $ 4,220 $ 4,597