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Investments - Gross Unrealized Gains and Losses and Cost of Equity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Equity securities, Cost $ 44,046 $ 50,185
Equity securities, Gross Unrealized Gains 13,101 11,873
Equity securities $ 57,147 $ 62,058