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Restructuring - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2023
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring, description |  | The Company restructured its insurance operations to strengthen its market presence and enhance its focus on GBLI’s core Package Specialty and Targeted Specialty products. As a result, the Company exited its four brokerage divisions: Professional Liability, Excess Casualty, Environmental, and Middle Market Property. The Company ceased writing new business and existing renewals were placed in run-off for these four divisions. The restructuring plan, which was initiated in the fourth quarter of 2022, was completed in the first quarter of 2023. |
Restructuring, initiation date |  | Dec. 31, 2022 |
Restructuring, completion date |  | Mar. 31, 2023 |
Restructuring cost | $ 3.4 | $ 2.1 | $ 5.5

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