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Debt - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Apr. 30, 2022
Aug. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]          
Margin Borrowing Facility     $ 0 $ 126,430,000  
Interest expense     3,004,000 10,481,000 $ 15,792,000
Redemption of aggregate principal amount     130,000,000 0 100,000,000
Loss on extinguishment of debt     $ (3,529,000) 0 (3,060,000)
7.75% Subordinated Notes due 2045          
Debt Instrument [Line Items]          
Stated interest rate     7.75%    
Interest expense     $ 0 0 4,900,000
Redemption of aggregate principal amount   $ 100,000,000.0      
Subordinated Notes due date     2045    
Loss on extinguishment of debt         3,100,000
7.875% Subordinated Notes due 2047          
Debt Instrument [Line Items]          
Margin Borrowing Facility [1]     $ 0 $ 126,430,000 [2]  
Stated interest rate 7.875%   7.875% 7.875%  
Interest expense     $ 3,000,000.0 $ 10,400,000 10,400,000
Redemption of aggregate principal amount     $ 130,000,000.0    
Subordinated Notes due date 2047   2047 2047  
Loss on extinguishment of debt     $ 3,500,000    
Debt instrument, redemption description     On April 15, 2022, the Company redeemed the entire $130.0 million in aggregate principal amount of the outstanding 2047 Notes plus accrued and unpaid interest on the 2047 Notes redeemed to, but not including the Redemption Date of April 15, 2022.    
Margin borrowing facilities          
Debt Instrument [Line Items]          
Margin Borrowing Facility     $ 0 $ 0  
Stated interest rate     5.10% 0.80%  
Collateral deposited to support borrowing     $ 0 $ 0  
Debt Securities, Available-for-Sale, Restriction Type [Extensible Enumeration]     us-gaap:AssetPledgedAsCollateralMember us-gaap:AssetPledgedAsCollateralMember  
Interest expense     $ 0 $ 0 $ 500,000
[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