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Subsequent Events - Additional Information (Detail) (USD $)
0 Months Ended
Jan. 15, 2015
Jan. 01, 2015
Dec. 31, 2014
Dec. 31, 2013
Subsequent Event [Line Items]        
Allocated to goodwill     $ 4,820,000us-gaap_Goodwill $ 4,820,000us-gaap_Goodwill
Subsequent Events | Global Indemnity Group Inc | American Reliable Insurance Company        
Subsequent Event [Line Items]        
Aggregate purchase price   113,700,000us-gaap_PaymentsToAcquireBusinessesGross
/ dei_LegalEntityAxis
= gbli_GlobalIndemnityGroupIncMember
/ gbli_PendingBusinessAcquisitionAxis
= gbli_AmericanReliableInsuranceCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Business acquisition date   Jan. 01, 2015    
Acquired voting equity interest   100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ dei_LegalEntityAxis
= gbli_GlobalIndemnityGroupIncMember
/ gbli_PendingBusinessAcquisitionAxis
= gbli_AmericanReliableInsuranceCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Customary insurance liabilities, obligations, and mandates   322,900,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ dei_LegalEntityAxis
= gbli_GlobalIndemnityGroupIncMember
/ gbli_PendingBusinessAcquisitionAxis
= gbli_AmericanReliableInsuranceCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Estimated purchase price   117,900,000gbli_BusinessAcquisitionCostOfAcquiredEntityEstimatedPurchasePrice
/ dei_LegalEntityAxis
= gbli_GlobalIndemnityGroupIncMember
/ gbli_PendingBusinessAcquisitionAxis
= gbli_AmericanReliableInsuranceCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Allocated to tangible net assets 87,700,000gbli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetTangibleAssets
/ dei_LegalEntityAxis
= gbli_GlobalIndemnityGroupIncMember
/ gbli_PendingBusinessAcquisitionAxis
= gbli_AmericanReliableInsuranceCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Allocated to intangible assets 27,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ dei_LegalEntityAxis
= gbli_GlobalIndemnityGroupIncMember
/ gbli_PendingBusinessAcquisitionAxis
= gbli_AmericanReliableInsuranceCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Allocated to goodwill 2,700,000us-gaap_Goodwill
/ dei_LegalEntityAxis
= gbli_GlobalIndemnityGroupIncMember
/ gbli_PendingBusinessAcquisitionAxis
= gbli_AmericanReliableInsuranceCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Amortization period of goodwill 15 years      
Subsequent Events | Global Indemnity Group Inc | American Reliable Insurance Company | Fox Paine & Company, LLC        
Subsequent Event [Line Items]        
Investment bank fee as a percentage of the required capital   3.00%gbli_InvestmentBankFeePercentage
/ dei_LegalEntityAxis
= gbli_GlobalIndemnityGroupIncMember
/ gbli_PendingBusinessAcquisitionAxis
= gbli_AmericanReliableInsuranceCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbli_FoxPaineAndCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Investment Advisory Fees   $ 1,500,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ dei_LegalEntityAxis
= gbli_GlobalIndemnityGroupIncMember
/ gbli_PendingBusinessAcquisitionAxis
= gbli_AmericanReliableInsuranceCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbli_FoxPaineAndCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Ordinary shares of Global Indemnity issued to pay fees   267,702gbli_OrdinaryASharesIssued
/ dei_LegalEntityAxis
= gbli_GlobalIndemnityGroupIncMember
/ gbli_PendingBusinessAcquisitionAxis
= gbli_AmericanReliableInsuranceCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gbli_FoxPaineAndCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember