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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
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Receivables [Abstract]                        
Balance at beginning of year         $ 37,452       $ 40,511 $ 37,452 $ 40,511 $ 30,089
Provision for credit losses   $ 19,427 $ 16,410 $ 13,386 $ 13,791 $ 11,449 $ 14,085 $ 12,102 $ 9,712 63,014 47,348 69,057
Credit losses                   (64,064) (55,043) (58,236)
Credit losses (180+ policy change) $ (2,100)                     (2,106)
Recoveries                   4,848 4,636 1,707
Balance at end of year   $ 41,250       $ 37,452       $ 41,250 $ 37,452 $ 40,511