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Finance Receivables, Allowance for Credit Losses and Credit Quality Information - Summary of Changes in Allowance for Credit Losses (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Receivables [Abstract]        
Balance at beginning of year $ 24,630 $ 19,860 $ 23,616 $ 19,300
Provision for credit losses 8,405 5,908 16,476 11,535
Finance receivables charged off (7,676) (5,210) (15,032) (10,452)
Recoveries 260 222 559 397
Balance at end of year $ 25,619 $ 20,780 $ 25,619 $ 20,780