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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2014
Commitments and Contingencies [Line Items]
Commitment to purchase alternative investment			$ 50,000
Future Funding Commitments	$ 14,214	$ 14,214
European Non-Performing Loan Fund, LP
Commitments and Contingencies [Line Items]
Funded commitment amount	35,800
Unfunded Commitments | European Non-Performing Loan Fund, LP
Commitments and Contingencies [Line Items]
Future Funding Commitments	$ 14,200

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- Definition

Commitment To Purchase Alternative Investment

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No definition available.

+ Details

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Namespace Prefix:	gbli_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Commitments And Contingencies [Line Items]

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No definition available.

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

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- Definition

Funded Commitment Amount

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No definition available.

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Name:	gbli_FundedCommitmentAmount
Namespace Prefix:	gbli_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Future Funding Commitments

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No definition available.

+ Details

Name:	gbli_FutureFundingCommitments
Namespace Prefix:	gbli_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=gbli_EuropeanNonPerformingLoanFundLimitedPartnershipMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

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Namespace Prefix:
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Balance Type:
Period Type: