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Securitized Debt and Securitized Debt at Fair Value - Additional Information (Detail)
9 Months Ended
Sep. 30, 2023
Securities
Securitization Financial Asset For Which Transfer Is Accounted As Sale [Line Items]  
Number of securitizations 23
Minimum  
Securitization Financial Asset For Which Transfer Is Accounted As Sale [Line Items]  
Securities redemption when principal balance is less than a certain percentage 10.00%
Maturity dates of the securities 2046-04
Maximum  
Securitization Financial Asset For Which Transfer Is Accounted As Sale [Line Items]  
Securities redemption when principal balance is less than a certain percentage 30.00%
Maturity dates of the securities 2053-07