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Summary of Estimated Fair Values of Bonds Held on Deposit (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value $ 256,952 $ 431,356
On Deposit With Governmental Authorities    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 27,082 26,431
Intercompany Trusts Held For Benefit Of U.S. Policyholders    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 142,496 179,116
Held In Trust Pursuant To Third Party Requirements    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 84,174 133,122
Letter Of Credit Held For Third Party Requirements    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 2,645 1,458
Securities Held As Collateral    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value $ 555 $ 91,229