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Significant Accounting Policies - Summary of Impact of Adoption on the Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Jan. 01, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses | $ 146 | $ 11 |  | $ 55,031 | $ 47,534 | $ 43,858 | $ 53,146
Reserve for repurchase liability | 0 |  |  | 4,241 |  |  |
Increase in retained earnings | $ (82,182) |  |  | $ 92,320 |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Fair value adjustment to finance receivables |  |  | $ 23,584 |  |  |  |
Allowance for credit losses |  |  | 55,031 |  |  |  |
Unamortized loan origination costs |  |  | (13,421) |  |  |  |
Reserve for repurchase liability |  |  | 4,241 |  |  |  |
Increase in retained earnings |  |  | $ 69,435 |  |  |  |

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