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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Additional Information (Detail) - USD ($) | 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 | Sep. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in net income |  | $ 6,467,000 | $ 6,476,000 | $ 5,912,000 | $ 5,176,000 | $ 7,367,000 | $ 6,507,000 | $ 5,408,000 | $ 4,083,000 |  | $ 24,031,000 | $ 23,365,000 | $ 14,802,000
Increase (decrease) in diluted earnings per share |  | $ 0.55 | $ 0.56 | $ 0.49 | $ 0.40 | $ 0.56 | $ 0.50 | $ 0.41 | $ 0.31 |  | $ 1.99 | $ 1.79 | $ 1.14
Credit losses | $ 2,100,000 |  |  |  |  |  |  |  |  |  |  |  | $ 2,106,000
Contractual delinquent period of loans | 180 days |  |  |  |  |  |  |  |  |  | 180 days |  | 180 days
Increase in provision for credit losses |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |
Decrease in net income |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000
Decrease in diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.02
Increase in loss allowance due to change in allowance assumption |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |
Decrease in net income from a change in allowance assumption |  |  |  |  |  |  |  |  |  |  |  | $ (300,000) |
Decrease in diluted earnings per share from a change in allowance assumption |  |  |  |  |  |  |  |  |  |  |  | $ (0.02) |
Allowance for credit losses as percentage of loans |  | 5.70% |  |  |  | 6.00% |  |  |  |  | 5.70% | 6.00% | 7.40%
Effective life of the large loan product category, previous |  |  |  |  |  |  |  |  |  |  |  | 10 months |
Effective life of the large loan product category, new |  |  |  |  |  |  |  |  |  |  |  | 12 months |
Recoveries |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  | $ 2,000,000 |
Sales of previously charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | $ 0
Impaired finance receivables as a percentage of total finance receivables |  |  |  |  |  |  |  |  |  |  | 1.60% | 1.20% |
Large Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit losses |  |  |  |  |  |  |  |  |  |  |  |  | $ 203,000
Allowance for credit losses as percentage of loans |  | 4.90% |  |  |  | 3.80% |  |  |  |  | 4.90% | 3.80% | 4.30%
As Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual delinquent period of loans | 365 days |  |  |  |  |  |  |  |  |  |  |  |
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 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 and forward, it 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 |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |
Increase (decrease) in net income |  |  |  |  |  |  |  |  |  |  | $ 300,000 |  |
Increase (decrease) in diluted earnings per share |  |  |  |  |  |  |  |  |  |  | $ 0.03 |  |

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