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Background and Business Description - Additional Information (Detail) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 29, 1991 | Dec. 31, 2025 USD ($) $ / shares shares | Dec. 31, 2019 | Dec. 31, 2024 shares | Apr. 30, 2013 $ / shares
Background And Basis Of Presentation [Line Items] |  |  |  |  |
Common stock, shares authorized | shares |  | 130,000,000 |  | 130,000,000 |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.01
Preferred stock, shares authorized | shares |  | 20,000,000 |  | 20,000,000 |
Preferred Stock, Par or Stated Value Per Share | $ / shares |  | $ 0.01 |  |  | $ 0.01
Common Stock Transfer Restrictions | 5.00% |  |  |  |
Common Stock Additional Transfer Restrictions |  |  | 5.00% |  |
Number of Admitted Carriers Owned | $ |  | 5 |  |  |
Number of Reportable Segments |  | 2 |  |  |

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