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Valuation and Qualifying Accounts and Reserves (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Investment Asset Valuation Reserves, Mortgage Loans      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 0 $ 0 $ 0
Charged (Credited) to Costs and Expenses 0 0 0
Charged (Credited) to Other Accounts 0   0
Other Deductions 0 0 0
Balance at End of Period 0 0 0
Investment Asset Valuation Reserves, Real Estate      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 0 0 0
Charged (Credited) to Costs and Expenses 0 0 0
Charged (Credited) to Other Accounts 0 0 0
Other Deductions 0 0 0
Balance at End of Period 0 0 0
Allowance for Doubtful Accounts, Premiums, Accounts and Notes Receivable      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 2,996 2,900 2,754
Charged (Credited) to Costs and Expenses 326 96 146
Charged (Credited) to Other Accounts 0 0 0
Other Deductions 0 0 0
Balance at End of Period 3,322 2,996 2,900
Allowance for Doubtful Accounts, Deferred Tax Asset Valuation Allowance      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 0 0 0
Charged (Credited) to Costs and Expenses 0   0
Charged (Credited) to Other Accounts 0 0 0
Other Deductions 0 0 0
Balance at End of Period 0 0 0
Allowance for Doubtful Accounts, Reinsurance Receivable      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 8,992 8,992 8,992
Charged (Credited) to Costs and Expenses 0   0
Charged (Credited) to Other Accounts 0 0 0
Other Deductions 0 0 0
Balance at End of Period $ 8,992 $ 8,992 $ 8,992