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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Receivables [Abstract]        
Balance at beginning of period $ 36,230 $ 36,950 $ 37,452 $ 40,511
Provision for credit losses 13,386 12,102 27,177 21,814
Charge-offs (14,702) (13,439) (30,896) (27,548)
Recoveries 1,286 558 2,467 1,394
Balance at end of period $ 36,200 $ 36,171 $ 36,200 $ 36,171