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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]        
Realized (loss) gain on equity securities sold $ (1,358)   $ (1,675) $ (55)
Unrealized (loss) gain on equity securities held (1,217) $ (68) (8,849) 2,844
Total (loss) gain recognized, net $ (2,575) $ (68) $ (10,524) $ 2,789