v3.26.3
Investments - Gross Unrealized Gains and Losses and Cost of Equity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Equity securities, Cost $ 31,164 $ 31,165
Equity securities, Gross Unrealized Gains 32,595 26,328
Equity securities, at fair value 63,759 57,493
Domestic Common Stock [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Equity securities, Cost 31,164 31,165
Equity securities, Gross Unrealized Gains 32,595 26,328
Equity securities, at fair value $ 63,759 $ 57,493