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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Reconciliation of 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
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Balance at beginning of year         $ 37,452       $ 40,511 $ 37,452 $ 40,511 $ 30,089
Provision   $ 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
Finance receivables   $ 717,775       $ 628,444       $ 717,775 $ 628,444 $ 546,192
Allowance as Percentage of Finance Receivable   5.70%       6.00%       5.70% 6.00% 7.40%
Small Loans [Member]                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Balance at beginning of year         21,535       25,280 $ 21,535 $ 25,280 $ 15,370
Provision                   41,119 33,428 50,755
Credit losses                   (43,797) (40,059) (40,697)
Credit Losses (180+Policy Change)                       (1,132)
Recoveries                   2,913 2,886 984
Balance at end of year   $ 21,770       $ 21,535       21,770 21,535 25,280
Finance receivables   $ 358,471       $ 338,157       $ 358,471 $ 338,157 $ 319,533
Allowance as Percentage of Finance Receivable   6.10%       6.40%       6.10% 6.40% 7.90%
Large Loans [Member]                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Balance at beginning of year         5,593       1,980 $ 5,593 $ 1,980 $ 2,233
Provision                   14,261 6,032 1,985
Credit losses                   (8,946) (2,762) (2,334)
Credit Losses (180+Policy Change)                       (203)
Recoveries                   552 343 299
Balance at end of year   $ 11,460       $ 5,593       11,460 5,593 1,980
Finance receivables   $ 235,349       $ 146,553       $ 235,349 $ 146,553 $ 46,147
Allowance as Percentage of Finance Receivable   4.90%       3.80%       4.90% 3.80% 4.30%
Automobile Loans [Member]                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Balance at beginning of year         8,828       11,776 $ 8,828 $ 11,776 $ 10,827
Provision                   4,785 6,285 14,259
Credit losses                   (8,886) (10,466) (12,939)
Credit Losses (180+Policy Change)                       (688)
Recoveries                   1,183 1,233 317
Balance at end of year   $ 5,910       $ 8,828       5,910 8,828 11,776
Finance receivables   $ 90,432       $ 116,109       $ 90,432 $ 116,109 $ 154,382
Allowance as Percentage of Finance Receivable   6.50%       7.60%       6.50% 7.60% 7.60%
Retail Loans [Member]                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Balance at beginning of year         $ 1,496       $ 1,475 $ 1,496 $ 1,475 $ 1,659
Provision                   2,849 1,603 2,058
Credit losses                   (2,435) (1,756) (2,266)
Credit Losses (180+Policy Change)                       (83)
Recoveries                   200 174 107
Balance at end of year   $ 2,110       $ 1,496       2,110 1,496 1,475
Finance receivables   $ 33,523       $ 27,625       $ 33,523 $ 27,625 $ 26,130
Allowance as Percentage of Finance Receivable   6.30%       5.40%       6.30% 5.40% 5.60%