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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in net income |  | $ 10,885 | $ 5,309 | $ 6,135 | $ 7,634 | $ 6,467 | $ 6,476 | $ 5,912 | $ 5,176 | $ 29,963 | $ 24,031 | $ 23,365 |
Increase (decrease) in diluted earnings per share |  | $ 0.92 | $ 0.45 | $ 0.52 | $ 0.65 | $ 0.55 | $ 0.56 | $ 0.49 | $ 0.40 | $ 2.54 | $ 1.99 | $ 1.79 |
Increase (decrease) in provision for credit losses |  | $ 19,464 | $ 20,152 | $ 18,589 | $ 19,134 | $ 19,427 | $ 16,410 | $ 13,386 | $ 13,791 | $ 77,339 | $ 63,014 | $ 47,348 |
Increase in loss allowance due to change in allowance assumption |  |  |  |  |  |  |  |  |  | 100 |  | 500 |
Decrease in net income from a change in allowance assumption |  |  |  |  |  |  |  |  |  | $ (100) |  | $ (300) |
Decrease in diluted earnings per share from a change in allowance assumption |  |  |  |  |  |  |  |  |  | $ 0.01 |  | $ (0.02) |
Allowance for credit losses as percentage of loans |  | 6.00% |  |  |  | 5.70% |  |  |  | 6.00% | 5.70% | 6.00% |
Impaired finance receivables as a percentage of total finance receivables |  |  |  |  |  |  |  |  |  | 2.10% | 1.60% |  |
Previous [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss emergence period of large loan finance receivable |  |  |  |  |  |  |  |  |  | 12 months |  | 10 months |
Loss emergence period of small loan finance receivable |  |  |  |  |  |  |  |  |  | 6 months |  |  |
Loss emergence period of retail loan finance receivable |  |  |  |  |  |  |  |  |  | 10 months |  |  |
New [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss emergence period of large loan finance receivable |  |  |  |  |  |  |  |  |  | 10 months |  | 12 months |
Loss emergence period of small loan finance receivable |  |  |  |  |  |  |  |  |  | 7 months |  |  |
Loss emergence period of retail loan finance receivable |  |  |  |  |  |  |  |  |  | 11 months |  |  |
Large Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses as percentage of loans |  | 5.10% |  |  |  | 4.90% |  |  |  | 5.10% | 4.90% | 3.80% | 4.30%
Hurricanes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in net income |  |  | $ (1,900) |  |  |  |  |  |  |  |  |  |
Increase (decrease) in diluted earnings per share |  |  | $ (0.16) |  |  |  |  |  |  |  |  |  |
Increase (decrease) in provision for credit losses | $ 3,000 |  |  |  |  |  |  |  |  |  |  |  |
Bulk Sale of Charged Off Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Recoveries | $ 1,000 |  | $ 1,000 |  |  |  |  |  |  |  |  | $ 2,000 |
Change in Accounting Method Accounted for as Change in Estimate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses - factors influencing management's judgment |  |  |  |  |  |  |  |  |  | Prior to September 30, 2016, the general component reflected estimated credit losses for groups of finance receivables on a collective basis and was primarily based on historical loss rates (adjusted for qualitative factors). Effective September 30, 2016, the general component is primarily based on delinquency roll rates. Delinquency roll rate modeling is forward-looking and common practice in the consumer finance industry. |  |  |
Increase (decrease) in provision for credit losses |  |  |  |  |  |  |  |  |  |  | $ (500) |  |
Increase (decrease) in net income |  |  |  |  |  |  |  |  |  |  | $ 300 |  |
Increase (decrease) in diluted earnings per share |  |  |  |  |  |  |  |  |  |  | $ 0.03 |  |

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