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Organization and Basis of Presentation (Details)
 3 Months Ended
Mar. 31, 2015
item
store
Mar. 31, 2014
Dec. 31, 2014
Feb. 01, 2013
Jan. 07, 2015
Organization          
Number of owned, leased and/or supplied gasoline stations 1,447glp_NumberOfOwnedLeasedAndSuppliedGasolineStations        
Number of owned, leased and/or supplied convenience stores 287glp_NumberOfConvenienceStoresOwnedLeasedAndSupplied        
General partner interest (as a percent) 0.74%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest 0.83%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest      
Number of common units held 30,542,344us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding   30,604,961us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding    
Number of common units sold 3,565,000us-gaap_PartnersCapitalAccountUnitsSoldInPublicOffering        
Affiliates of general partner          
Organization          
Number of common units held 7,293,722us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= glp_AffiliatesOfGeneralPartnerMember		        
Limited partner ownership interest (as a percent) 23.50%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= glp_AffiliatesOfGeneralPartnerMember		        
Decrease in number of common units held 4,446,575glp_DecreaseInLimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= glp_AffiliatesOfGeneralPartnerMember		        
Affiliates of general partner | Directors and Chief Executive Officers          
Organization          
Number of common units held 2,306,960us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= glp_AffiliatesOfGeneralPartnerMember
/ us-gaap_TitleOfIndividualAxis
= glp_DirectorsAndChiefExecutiveOfficersMember		        
AE Holdings          
Organization          
Number of common units held 5,850,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= glp_AEHoldingsCorpMember		        
Limited partner ownership interest (as a percent) 37.90%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= glp_AEHoldingsCorpMember		        
Decrease in Limited partner ownership interest (as a percent) 23.50%glp_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpMembersOrLimitedPartnersDecreaseInOwnershipInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= glp_AEHoldingsCorpMember		        
Number of common units sold 1,956,234us-gaap_PartnersCapitalAccountUnitsSoldInPublicOffering
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= glp_AEHoldingsCorpMember		        
Basin Transload LLC          
Organization          
Percentage of outstanding membership interests acquired       60.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= glp_BasinTransloadLLCMember		  
Warren Equities Inc          
Organization          
Percentage of outstanding membership interests acquired         100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= glp_WarrenEquitiesIncMember
Members of Slifka family | AE Holdings          
Organization          
Number of common units held 1,586,806us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ glp_RelatedPartySecondaryCategorizationAxis
= glp_MembersOfSlifkaFamilyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= glp_AEHoldingsCorpMember