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Investments - Gross Realized Gains and Losses on Sale of Debt Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Investments Debt And Equity Securities [Abstract]        
Gross realized gains on debt securities $ 36 $ 24 $ 85 $ 49
Gross realized losses on debt securities (7) (50) (40) (365)
Total gain (loss) recognized, net $ 29 $ (26) $ 45 $ (316)