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Restructuring - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring, description	The Company is restructuring its insurance operations in an effort to strengthen its market presence and enhance its focus on GBLI’s core Wholesale Commercial and InsurTech 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	$ 2.2	$ 3.4	$ 5.6

X

- Definition

Date the exit and disposal activities were completed or are expected to be completed, in YYYY-MM-DD format.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(a))
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-Section 50
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- Definition

Description of a specific restructuring plan and related activities including the facts and circumstances leading to the restructuring or decision to exit an activity, and the expected completion date. This concept and related items would be utilized for each plan if multiple exit plans have been implemented in the period.

+ References

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-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
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Date the restructuring activities were initiated or are expected to be initiated, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
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-Subparagraph (SAB Topic 5.P.4(a))
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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