v3.26.1
Realized and Net Change in Unrealized Gains (Losses) in Other Investments (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Gain (Loss) on Securities [Line Items]        
Total Investment Income $ 2,472,721 $ 1,605,665 $ 3,617,364 $ 2,775,171
Other Investments        
Gain (Loss) on Securities [Line Items]        
Realized Gains (Losses) (8,275) 8,622 (4,495) 121,270
Net Change in Unrealized Gains 385,185 215,750 70,256 388,182
Total Investment Income $ 376,910 $ 224,372 $ 65,761 $ 509,452