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Summary Of Investments Other Than Investments In Related Parties (Detail)
$ in Thousands
Dec. 31, 2024
USD ($)
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost $ 1,436,336 [1]
Value 1,423,605
Amount Included in the Balance Sheet 1,423,605
Fixed Maturities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 1,394,639 [1]
Value 1,381,908
Amount Included in the Balance Sheet 1,381,908
Fixed Maturities | United States Government and Government Agencies and Authorities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 875,273 [1]
Value 875,246
Amount Included in the Balance Sheet 875,246
Fixed Maturities | States, Municipalities, and Political Subdivisions  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 17,125 [1]
Value 16,335
Amount Included in the Balance Sheet 16,335
Fixed Maturities | Mortgage Backed And Asset Backed Securities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 267,391 [1]
Value 259,915
Amount Included in the Balance Sheet 259,915
Fixed Maturities | Public Utilities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 10,090 [1]
Value 9,759
Amount Included in the Balance Sheet 9,759
Fixed Maturities | All Other Corporate Bonds  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 224,760 [1]
Value 220,653
Amount Included in the Balance Sheet 220,653
Equity securities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 12,284 [1]
Value 12,284
Amount Included in the Balance Sheet 12,284
Equity securities | Public Utilities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 0 [1]
Value 0
Amount Included in the Balance Sheet 0
Equity securities | Industrial and Miscellaneous  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 12,284 [1]
Value 12,284
Amount Included in the Balance Sheet 12,284
Other long-term investments | Other Invested Assets  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 29,413 [1]
Value 29,413
Amount Included in the Balance Sheet $ 29,413
[1] Original cost of fixed maturities adjusted for amortization of premiums and accretion of discounts; original cost of equity securities and other long-term investments adjusted for income or loss earned on investments in accordance with equity method of accounting. All amounts are shown net of impairment losses.