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Subsequent Event (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 0 Months Ended
Apr. 22, 2015
Apr. 09, 2015
item
General Partner Interest    
Subsequent Events    
Quarterly cash distribution declared (in dollars per unit) $ 0.68us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsDeclaredPerUnit
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_GeneralPartnerMember		  
Subsequent event | Purchase commitment | Capitol Petroleum Group    
Subsequent Events    
Number of gasoline stations acquired   97glp_NumberOfLocationsAcquired
/ us-gaap_CounterpartyNameAxis
= glp_CapitolPetroleumGroupMember
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= us-gaap_PurchaseCommitmentMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Number of dealer supply contracts   7glp_NumberOfDealerSupplyContractsEntered
/ us-gaap_CounterpartyNameAxis
= glp_CapitolPetroleumGroupMember
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= us-gaap_PurchaseCommitmentMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Total consideration   $ 156.0us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_CounterpartyNameAxis
= glp_CapitolPetroleumGroupMember
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= us-gaap_PurchaseCommitmentMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Number of fee properties   18glp_NumberOfFeePropertiesAcquired
/ us-gaap_CounterpartyNameAxis
= glp_CapitolPetroleumGroupMember
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= us-gaap_PurchaseCommitmentMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent event | General Partner Interest    
Subsequent Events    
Quarterly cash distribution declared (in dollars per unit) $ 0.68us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsDeclaredPerUnit
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_GeneralPartnerMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Subsequent event | General Partner Interest | Annualized basis    
Subsequent Events    
Quarterly cash distribution declared (in dollars per unit) $ 2.72us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsDeclaredPerUnit
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_GeneralPartnerMember
/ us-gaap_StatementScenarioAxis
= glp_AnnualizedBasisMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Subsequent event | Maximum | Purchase commitment | Capitol Petroleum Group    
Subsequent Events    
Period of extension for acquisition   30 days