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Future Minimum Lease Payments Under Non-cancelable Operating Leases (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Leases [Abstract]
Impairment of leases on property no longer in use	$ 2.2

X

- Definition

Impairment of leases on property no longer in use.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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