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Summary of Tax Effects of Temporary Differences (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred Tax Assets    
Investment Basis Differences/Net Unrealized Gains and Losses $ 2,031,002 $ 1,572,672
Other 31,720 8,965
Total Deferred Tax Assets 2,062,722 1,581,637
Deferred Tax Liabilities    
Investment Basis Differences/Net Unrealized Gains and Losses 15,409 15,421
Other 31,498 16,439
Total Deferred Tax Liabilities 46,907 31,860
Net Deferred Tax Assets $ 2,015,815 $ 1,549,777