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Restructuring - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
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 is exiting its four brokerage divisions: Professional Liability, Excess Casualty, Environmental, and Middle Market Property. The Company will cease writing new business and existing renewals will be placed in run-off for these four divisions. The restructuring plan was initiated in the fourth quarter of 2022 and is expected to be completed in the first quarter of 2023.
Restructuring, initiation date	Dec. 31, 2022
Restructuring, completion date	Mar. 31, 2023
Restructuring cost	$ 3.4
Employee Termination and Severance
Restructuring Cost and Reserve [Line Items]
Restructuring cost	2.6
Lease Right of Use Asset Impairments
Restructuring Cost and Reserve [Line Items]
Restructuring cost	0.8
Accrued Other Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring cost	$ 2.6

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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- 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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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
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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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