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Realized and Net Change in Unrealized Gains (Losses) in Other Investments (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Gain (Loss) on Securities [Line Items]    
Total Investment Income (Loss) $ 1,638,680 $ (495,677)
Other Investments    
Gain (Loss) on Securities [Line Items]    
Realized Gains 2,467 1,924
Net Change in Unrealized Gains (Losses) 455,800 (313,153)
Total Investment Income (Loss) $ 458,267 $ (311,229)