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Investments - Investments in Variable Interest Entities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss $ 1,600 $ 5,700
Variable interest entity, not primary beneficiary    
Variable Interest Entity [Line Items]    
Investment 2,020 2,857
Maximum Exposure to Loss $ 2,020 $ 2,857