XML 75 R66.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Commitments And Contingencies - Additional Information (Detail) (USD $) | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Commitments and Contingencies [Line Items] |  |
Commitment to purchase alternative investment | $ 50,000,000 |
Funded commitment amount | 18,300,000 |
Future Funding Commitments | 34,100,000 | 2,490,000
Unfunded Commitments | European Non-Performing Loan Fund, LP |  |
Commitments and Contingencies [Line Items] |  |
Future Funding Commitments | $ 31,700,000 |

X
- Details
Name: | gbli_CommitmentsAndContingenciesLineItems
Namespace Prefix: | gbli_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Commitment To Purchase Alternative Investment + References No definition available. + Details
Name: | gbli_CommitmentToPurchaseAlternativeInvestment
Namespace Prefix: | gbli_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Funded Commitment Amount + References No definition available. + Details
Name: | gbli_FundedCommitmentAmount
Namespace Prefix: | gbli_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Future Funding Commitments + References No definition available. + Details
Name: | gbli_FutureFundingCommitments
Namespace Prefix: | gbli_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant