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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

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