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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Receivables [Abstract]        
Balance at beginning of period $ 36,200 $ 36,171 $ 37,452 $ 40,511
Provision for credit losses 16,410 14,085 43,587 35,899
Charge-offs (14,680) (13,158) (45,576) (40,706)
Recoveries 1,170 688 3,637 2,082
Balance at end of period $ 39,100 $ 37,786 $ 39,100 $ 37,786