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Variable Interest Entities (VIEs) - Schedule of Maximum Exposure to Loss (Detail) - Non-Consolidated Variable Interest Entities [Member] - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]    
Investments in unconsolidated subsidiaries $ 65,341 $ 30,484
Other current assets 4,219 4,307
Co-investment commitments 53,971 29,696
Maximum exposure to loss $ 123,531 $ 64,487