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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Receivables [Abstract]        
Balance at beginning of period $ 47,750 $ 41,000 $ 48,910 $ 41,250
Provision for credit losses 20,203 18,589 39,718 37,723
Credit losses (20,666) (19,003) (42,686) (39,997)
Recoveries 1,163 1,414 2,508 3,024
Balance at end of period $ 48,450 $ 42,000 $ 48,450 $ 42,000