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Investments - Realized and Unrealized Gains and Losses related to Marketable Equity Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]        
Unrealized gain (loss) on equity securities held $ (1,130) $ (1,217) $ 1,404 $ (8,849)
Realized gain (loss) on equity securities sold (1) (1,358) 13 (1,675)
Total gain (loss) recognized, net $ (1,131) $ (2,575) $ 1,417 $ (10,524)