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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2014
Commitments and Contingencies [Line Items]
Commitment to purchase alternative investment			$ 50,000
Future Funding Commitments	$ 14,214	$ 14,214
Unfunded Commitments | European Non-Performing Loan Fund, LP
Commitments and Contingencies [Line Items]
Funded commitment amount	35,800
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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- Definition

Funded Commitment Amount

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No definition available.

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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

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

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- Details

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Namespace Prefix:
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- Details

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