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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Receivables [Abstract]        
Balance at beginning of period $ 56,400 $ 47,750 $ 58,300 $ 48,910
Provision for credit losses 25,714 20,203 49,057 39,718
Credit losses (26,001) (20,666) (52,378) (42,686)
Recoveries 1,087 1,163 2,221 2,508
Balance at end of period $ 57,200 $ 48,450 $ 57,200 $ 48,450