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Schedule of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]            
Fixed maturities $ 43,336   $ 21,591      
Foreign currency fluctuations (587)   (1,032)      
Deferred taxes (7,029)   (2,950)      
Accumulated other comprehensive income, net of tax $ 35,720 $ 37,693 $ 17,609 $ 25,314 $ 16,542 $ (21,231)