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Investment in Securities - Proceeds from Available for Sale Securities and Realized Gain Loss (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]      
Proceeds from sales of fixed maturity available-for-sale securities $ 45,017 $ 85,590 $ 161,223
Gross realized gains 250 376  
Gross realized gains     63,075
Gross realized losses $ (1,124) $ (2,298)  
Gross realized losses     $ (6,406)