Maximum Exposure to Loss Relating to Non-Consolidated VIEs (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
VIE Assets	$ 41,086,439	$ 42,524,227
VIE Liabilities	22,372,614	22,843,160
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum Exposure to Loss	3,361,088	3,900,835
Variable Interest Entity, Not Primary Beneficiary | Investments
Variable Interest Entity [Line Items]
VIE Assets	3,117,201	3,326,669
Variable Interest Entity, Not Primary Beneficiary | Due from Affiliates
Variable Interest Entity [Line Items]
VIE Assets	176,338	189,240
Variable Interest Entity, Not Primary Beneficiary | Potential Clawback Obligation
Variable Interest Entity [Line Items]
VIE Liabilities	67,549	384,926
Variable Interest Entity, Not Primary Beneficiary | Amounts Due to Non-Consolidated VIEs
Variable Interest Entity [Line Items]
VIE Liabilities	$ 137	$ 6