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Restructuring - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2024
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 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 non-renewed existing policies 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 | $ 0 | $ 2,000,000 | $ 3,400,000 | $ 5,400,000
Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Liability related restructuring plan |  | $ 100,000 |  |

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- Definition Date the exit and disposal activities were completed or are expected to be completed, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482017/420-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479823/420-10-S99-2 + Details
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