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Summary of Business Segment Information (Parenthetical) (Detail) (Insurance Operations, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Insurance Operations
Segment Reporting Information [Line Items]
Federal excise tax relating to cessions from Insurance Operations to Reinsurance Operations	$ 277	$ 264	$ 838	$ 482

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- Definition

Federal Excise Tax Expense Cessions From Insurance Operations To Reinsurance Operations

+ References

No definition available.

+ Details

Name:	gbli_FederalExciseTaxExpenseCessionsFromInsuranceOperationsToReinsuranceOperations
Namespace Prefix:	gbli_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration