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Components of Lease Expenses (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Leases [Abstract]
Sublease payments received	$ 1.6

X

- Definition

Proceeds from sublease payments.

+ References

No definition available.

+ Details

Name:	gbli_ProceedsFromSubleasePayments
Namespace Prefix:	gbli_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration