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Investments - Realized and Unrealized Gains and Losses related to Marketable Equity Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]        
Realized (loss) gain on equity securities sold $ (293) $ (79) $ (318) $ (55)
Unrealized (loss) gain on equity securities held (4,268) 2,011 (7,630) 2,912
Total (loss) gain recognized, net $ (4,561) $ 1,932 $ (7,948) $ 2,857