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Changes in Level 3 Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value Disclosures [Abstract]      
Beginning balance $ 0 $ 4,571 $ 2,769
Included in accumulated other comprehensive income (loss) $ 0 $ 30 $ (21)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax
Included in earnings attributable to realized gains / losses $ 0 $ (290) $ (61)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Realized Investment Gains (Losses) Realized Investment Gains (Losses) Realized Investment Gains (Losses)
Transfers into level 3 $ 0 $ 0 $ 857
Transfers out of level 3 0 0 0
Amortization of bond premium and discount, net 0 5 6
Purchases 0 332 2,304
Sales 0 (4,648) (1,283)
Ending balance 0 0 4,571
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) related to assets still held at end of reporting period $ 0 $ (155) $ 95
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax