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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, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]    
Investments in unconsolidated subsidiaries $ 26,999 $ 23,266
Other current assets 4,180 3,827
Co-investment commitments 30,167 22,363
Maximum exposure to loss $ 61,346 $ 49,456