Quarterly report pursuant to Section 13 or 15(d)

Variable Interest Entities and Securitizations - Summary of the Outstanding Collateral and Certificate Balances for Securitization Trusts (Detail)

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Variable Interest Entities and Securitizations - Summary of the Outstanding Collateral and Certificate Balances for Securitization Trusts (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Schedule Of Collateral And Certificate Balances For Securitization Trusts [Line Items]        
Total certificate balances $ 22,668,093 $ 20,100,419 $ 19,565,155 $ 19,022,015
Unconsolidated Securitization Trusts        
Schedule Of Collateral And Certificate Balances For Securitization Trusts [Line Items]        
Total certificate balances 795,077   0  
Unconsolidated Securitization Trusts | Asset Pledged as Collateral        
Schedule Of Collateral And Certificate Balances For Securitization Trusts [Line Items]        
Total certificate balances $ 795,077   $ 0