XML 65 R58.htm IDEA: XBRL DOCUMENT
v3.25.1

Schedule of Distributions Declared (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 28, 2025 | Mar. 28, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Dividends Payable [Line Items] |  |  |  |  |
Payment of dividends |  | $ 4,990 | $ 4,752 | $ 4,990 | $ 4,770
O 2025 Q1 Dividends |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Approval Date |  |  |  | Mar. 06, 2025 |
Record Date |  |  |  | Mar. 21, 2025 |
Payment Date |  |  |  | Mar. 28, 2025 |
O 2024 Q1 Dividends |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Approval Date |  |  |  |  | Mar. 06, 2024
Record Date |  |  |  |  | Mar. 21, 2024
Payment Date |  |  |  |  | Mar. 28, 2024
Unvested Shares, Net of Forfeitures |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Approval Date | [1] |  |  |  | Various
Record Date | [1] |  |  |  | Various
Payment Date | [1] |  |  |  | Various
Payment of dividends | [1] |  |  |  | $ 18
[1] | Represents distributions declared on unvested shares, net of forfeitures.

X
- Definition Dividends approval date description. + References No definition available. + Details
Name: | gbli_DividendsApprovalDateDescription
Namespace Prefix: | gbli_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Dividends net of forfeitures. + References No definition available. + Details
Name: | gbli_DividendsNetOfForfeitures
Namespace Prefix: | gbli_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Dividends payment date description. + References No definition available. + Details
Name: | gbli_DividendsPaymentDateDescription
Namespace Prefix: | gbli_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Dividends record date description. + References No definition available. + Details
Name: | gbli_DividendsRecordDateDescription
Namespace Prefix: | gbli_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the declared dividend will be paid, in YYYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 + Details
Name: | us-gaap_DividendPayableDateToBePaidDayMonthAndYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 2 -SubTopic 405 -Topic 942 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477787/942-405-45-2 + Details
Name: | us-gaap_Dividends
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Date the dividend to be paid was declared, in YYYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 + Details
Name: | us-gaap_DividendsPayableDateDeclaredDayMonthAndYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the holder must own the stock to be entitled to the dividend, in YYYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DividendsPayableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DividendsAxis=gbli_O2025Q1DividendsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=gbli_O2024Q1DividendsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=gbli_UnvestedSharesNetOfForfeituresMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |