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Maximum Exposure to Loss Relating to Non-Consolidated VIEs (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
VIE Assets $ 39,706,302 $ 40,287,530
VIE Liabilities 21,228,868 22,212,316
Due from Affiliates    
Variable Interest Entity [Line Items]    
VIE Assets 266,394 203,187
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 4,250,732 4,026,897
Variable Interest Entity, Not Primary Beneficiary | Potential Clawback Obligation    
Variable Interest Entity [Line Items]    
VIE Liabilities 78,823 72,119
Variable Interest Entity, Not Primary Beneficiary | Amounts Due to Non-Consolidated VIEs    
Variable Interest Entity [Line Items]    
VIE Liabilities 557 223
Variable Interest Entity, Not Primary Beneficiary | Investments    
Variable Interest Entity [Line Items]    
VIE Assets $ 3,905,515 $ 3,751,591