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Variable Interest Entities (VIEs) (Detail) - Variable Interest Entity, Not Primary Beneficiary - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Investments in unconsolidated subsidiaries $ 78,561 $ 66,947
Other current assets 4,219 4,219
Co-investment commitments 91,865 47,957
Maximum exposure to loss $ 174,645 $ 119,123