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Outstanding Debt (Parenthetical) (Detail) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Debt   $ 0 $ 126,430
7.875% Subordinated Notes due 2047      
Debt Instrument [Line Items]      
Subordinated Notes percentage 7.875% 7.875% 7.875%
Subordinated Notes due date 2047 2047 2047
Outstanding principal     $ 130,000
Debt [1]   $ 0 126,430 [2]
Unamortized debt costs     $ 3,600
[1] As of December 31, 2021, the carrying value and fair value of the 7.875% Subordinated Notes due 2047 are net of unamortized debt issuance cost of $3.6 million. In April 2022, the Company redeemed all of its outstanding 7.875% subordinated notes due 2047 and unamortized debt issuance cost of $3.5 million was written off and included in the consolidated statements of operations as loss on extinguishment of debt.
[2] Amounts outstanding at December 31, 2021 represent outstanding principal of $130.0 million, net of unamortized debt costs of $3.6 million