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Supplemental Non-Cash Investing and Financing Activities - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Supplemental Cash Flow Elements [Line Items]
Operating lease, right-of-use asset	$ 8,424	$ 9,295

X

- Definition

Supplemental cash flow elements.

+ References

No definition available.

+ Details

Name:	gbli_SupplementalCashFlowElementsLineItems
Namespace Prefix:	gbli_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

Name:	us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant