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Investment Securities - Additional Information (Detail) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) security assetBackedSecurity contract | Jun. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) security assetBackedSecurity contract | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) security assetBackedSecurity contract | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) security
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Proceed from sales of foreign subsidiaries |  | $ 3,800 |  |  | $ 0 | $ 3,765 |
Loss on sale of foreign subsidiaries |  | $ 2,800 | $ 0 | $ 0 | 0 | 2,840 |
Unrealized gain on investment securities |  |  |  |  |  | 2,700 |
Proceeds from sales of investment securities available for sale |  |  | $ 126,600 | 258,400 | $ 681,633 | 666,023 |
Number of available-for-sale investment securities, unrealized loss position, less than twelve month category | security | 128 |  | 128 |  | 128 |  |
Number of available-for-sale investment securities, unrealized loss position, twelve month or more category | contract | 19 |  | 19 |  | 19 |  |
Number of asset-backed securities with deterioration in future estimated cash flows | assetBackedSecurity | 4 |  | 4 |  | 4 |  |
Number of available-for-sale investment securities, unrealized loss position | security | 147 |  | 147 |  | 147 |  | 117
Carrying value of consumer loans sold | $ 521,800 |  |  |  |  |  |
Loss on sale of loans | 23,500 |  | $ 23,400 | $ (5,800) | $ 19,700 | $ (10,100) |
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest | 0 |  | 0 |  | 0 |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Asset-backed securities collateralized by loans sold | 400,000 |  | 400,000 |  | 400,000 |  |
Asset Pledged as Collateral |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Debt securities | $ 17,500 |  | $ 17,500 |  | $ 17,500 |  | $ 11,300

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