v3.25.1
Investments - Summary of Unaudited Financial Information and Unaudited Financial Position of Limited Partnerships (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Schedule Of Equity Method Investments [Line Items]      
Total income $ 216,433 $ 206,614  
Net income 74,230 56,956  
Balance sheet:      
Total assets 2,306,668   $ 2,230,213
Total liabilities 1,762,199   1,761,172
Limited Partnership [Member]      
Schedule Of Equity Method Investments [Line Items]      
Total income (8,373) 3,066  
Total expenses (16,215) (25,601)  
Net income (24,588) $ (22,535)  
Balance sheet:      
Total assets 3,979,579   4,118,765
Total liabilities $ 172,868   $ 157,420