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Disclosures About Fair Value of Financial Instruments - Summary of Financial Assets and Financial Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis (Detail) $ in Thousands | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 2,746,728 | $ 2,961,015
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 42,365 | 73,266
Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 104,716 | 160,542
Asset-backed securities | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 42,365 | $ 73,266
Minimum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.10 | 0.09
Minimum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Annualized loss rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.03 | 0.04
Minimum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Constant prepayment rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.12 | 0.19
Maximum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.10 | 0.09
Maximum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Annualized loss rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.06 | 0.05
Maximum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Constant prepayment rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.30 | 0.25
Weighted Average | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.10 | 0.09
Weighted Average | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Annualized loss rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.05 | 0.05
Weighted Average | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Constant prepayment rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.25 | 0.23

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