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Schedule of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]            
Fixed maturities $ 30,451   $ (22,675)      
Foreign currency fluctuations (1,003)   (1,334)      
Deferred taxes (4,134)   2,778      
Accumulated other comprehensive income, net of tax $ 25,314 $ 16,542 $ (21,231) $ (23,829) $ (22,475) $ 8,983