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Investments - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 29, 2020
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]        
Total investments   $ 174,400,000 $ 177,400,000  
Proceeds from investments   800,000 6,900,000 $ 8,000,000
Non Marketable Equity Securities        
Schedule of Equity Method Investments [Line Items]        
Total investments   124,100,000 124,100,000  
Non Marketable Equity Securities | Series A Convertible Preferred Stock [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of shares acquired 40,000,000      
Investment acquired purchase price $ 40,000,000      
Dividend received   8,000,000 8,000,000 $ 8,000,000
Seed Capital Investments        
Schedule of Equity Method Investments [Line Items]        
Total investments   26,400,000 23,100,000  
Proceeds from investments     3,600,000  
Partnership interests in private equity funds        
Schedule of Equity Method Investments [Line Items]        
Total investments   4,300,000 8,600,000  
Investments, fair value   3,100,000 7,300,000  
Equity method investments, fair value   $ 1,200,000 $ 1,300,000