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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
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]      
Balance at beginning of period $ 48,910 $ 41,250 $ 37,452
Provision for credit losses 87,056 77,339 63,014
Credit losses (82,341) (75,880) (64,064)
Recoveries 4,675 6,201 4,848
Balance at end of period $ 58,300 $ 48,910 $ 41,250