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Summary of Net Gain (Loss) Included in Consolidated Statements of Operations for Changes in Fair Value of Derivatives and Periodic Net Interest Settlements Under Derivatives (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]      
Net gain (loss) for changes in fair value and net settlements of derivatives $ 10,073 $ 2,105 $ (22,256)
Interest Rate Swap      
Derivative Instruments, Gain (Loss) [Line Items]      
Net gain (loss) for changes in fair value and net settlements of derivatives 3,000 5,600 4,500
Interest Rate Swap | Net Realized Investment Gains (Losses)      
Derivative Instruments, Gain (Loss) [Line Items]      
Net gain (loss) for changes in fair value and net settlements of derivatives 10,073 2,424 (10,691)
Futures Contracts on Bonds | Net Realized Investment Gains (Losses)      
Derivative Instruments, Gain (Loss) [Line Items]      
Net gain (loss) for changes in fair value and net settlements of derivatives 0 (319) (2,576)
Futures Contracts on Equities | Net Realized Investment Gains (Losses)      
Derivative Instruments, Gain (Loss) [Line Items]      
Net gain (loss) for changes in fair value and net settlements of derivatives $ 0 $ 0 $ (8,989)