XML 80 R70.htm IDEA: XBRL DOCUMENT
v3.23.1

Information with Respect to Class A Common Shares that were Surrendered or Repurchased (Detail) - Class A Common Shares - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares repurchased | [1] | 253,302 |  | 4,781
Average Price Paid Per Share | [1] | $ 25.82 |  | $ 25.13
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program | [1] | 0 |  | 0
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs | [1] | $ 0 | [2] | $ 0
January 1-31, 2023 | Employee |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares repurchased | [1],[3] | 3,302 |  |
Average Price Paid Per Share | [1] | $ 23.31 |  |
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program | [1] | 0 |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs | [1],[2] | $ 0 |  |
January 1-31, 2023 | $60 Million Share Repurchase Program |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares repurchased | [1],[4] | 250,000 |  |
Average Price Paid Per Share | [1] | $ 25.90 |  |
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program | [1] | 250,000 |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs | [1],[2] | $ 31,604,066 |  |
January 1-31, 2022 |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares repurchased | [1],[3] |  |  | 4,781
Average Price Paid Per Share | [1] |  |  | $ 25.13
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program | [1] |  |  | 0
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs | [1] |  |  | $ 0
[1] | Based on settlement date.
[2] | Based on the $60 million share repurchase authorization.
[3] | Surrendered by employees as payment of taxes withheld on the vesting of restricted stock and/or restricted stock units.
[4] | Purchased as part of the repurchase program announced in October 2022.

X
- Definition Number Of Shares Purchased As Part Of Publicly Announced Plan + References No definition available. + Details
Name: | gbli_NumberOfSharesPurchasedAsPartOfPubliclyAnnouncedPlan
Namespace Prefix: | gbli_
Data Type: | xbrli:sharesItemType
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_EquityClassOfTreasuryStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 + Details
Name: | us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
Name: | us-gaap_TreasuryStockAcquiredAverageCostPerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gbli_ShareRepurchaseInitiationDateAxis=gbli_JanuaryOneToJanuaryThirtyOneTwoThousandAndTwentyThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=gbli_EmployeeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=gbli_SixtyMillionShareRepurchaseProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gbli_ShareRepurchaseInitiationDateAxis=gbli_JanuaryOneToJanuaryThirtyOneTwoThousandAndTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |