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Schedule of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]      
Fixed maturities $ 21,591 $ (22,675)  
Foreign currency fluctuations (1,032) (1,334)  
Deferred taxes (2,950) 2,778  
Accumulated other comprehensive income, net of tax $ 17,609 $ (21,231) $ 8,983