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Cash Distributions (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Feb. 13, 2015
Mar. 31, 2015
item
Apr. 22, 2015
Dec. 31, 2014
Cash Distributions        
Period of distribution of available cash after end of each quarter   45 days    
Number of quarters of cash reserves to provide funds for distributions to unitholders and General Partner   4glp_NumberOfQuarterlyPeriodsOfCashReservesToProvideFundsForDistributionsToUnitholdersAndGeneralPartner    
Cash Distribution Payment        
Per Unit Cash Distribution (in dollars per unit) $ 0.6650us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsPaidPerUnit      
Incentive Distribution $ 1,591us-gaap_IncentiveDistributionDistributionPerYear      
Cash distribution to common unitholders 22,357us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid      
General Partner Interest        
Distribution declared        
Quarterly cash distribution declared (in dollars per unit)     $ 0.68us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsDeclaredPerUnit
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_GeneralPartnerMember
 
Subsequent event | General Partner Interest        
Cash Distributions        
Total Quarterly Distribution Target Amount (in dollars per unit)     $ 0.68glp_DistributionMadeToMemberOrLimitedPartnerQuarterlyCashDistributionsTargetAmountPerUnit
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_GeneralPartnerMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Distribution declared        
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        
Distribution declared        
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
 
Common Unitholders        
Cash Distribution Payment        
Cash distribution to common unitholders 20,612us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
     
General Partner Interest        
Cash Distribution Payment        
Cash distribution to common unitholders $ 154us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
     
Minimum Quarterly Distribution | Common Unitholders        
Cash Distributions        
Marginal Percentage Interest in Distributions   99.26%glp_DistributionMadeToMemberOrLimitedPartnerCashDistributionsDeclaredMarginalPercentageInterestInDistributions
/ glp_DistributionTargetLevelsAxis
= glp_MinimumQuarterlyDistributionMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
   
Minimum Quarterly Distribution | General Partner Interest        
Cash Distributions        
Marginal Percentage Interest in Distributions   0.74%glp_DistributionMadeToMemberOrLimitedPartnerCashDistributionsDeclaredMarginalPercentageInterestInDistributions
/ glp_DistributionTargetLevelsAxis
= glp_MinimumQuarterlyDistributionMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
   
First Target Distribution | Maximum        
Cash Distributions        
Total Quarterly Distribution Target Amount (in dollars per unit)   0.4625glp_DistributionMadeToMemberOrLimitedPartnerQuarterlyCashDistributionsTargetAmountPerUnit
/ glp_DistributionTargetLevelsAxis
= glp_FirstTargetDistributionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
First Target Distribution | Common Unitholders        
Cash Distributions        
Marginal Percentage Interest in Distributions   99.26%glp_DistributionMadeToMemberOrLimitedPartnerCashDistributionsDeclaredMarginalPercentageInterestInDistributions
/ glp_DistributionTargetLevelsAxis
= glp_FirstTargetDistributionMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
   
First Target Distribution | General Partner Interest        
Cash Distributions        
Marginal Percentage Interest in Distributions   0.74%glp_DistributionMadeToMemberOrLimitedPartnerCashDistributionsDeclaredMarginalPercentageInterestInDistributions
/ glp_DistributionTargetLevelsAxis
= glp_FirstTargetDistributionMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
   
Second Target Distribution | Minimum        
Cash Distributions        
Total Quarterly Distribution Target Amount (in dollars per unit)   0.4625glp_DistributionMadeToMemberOrLimitedPartnerQuarterlyCashDistributionsTargetAmountPerUnit
/ glp_DistributionTargetLevelsAxis
= glp_SecondTargetDistributionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Second Target Distribution | Maximum        
Cash Distributions        
Total Quarterly Distribution Target Amount (in dollars per unit)   0.5375glp_DistributionMadeToMemberOrLimitedPartnerQuarterlyCashDistributionsTargetAmountPerUnit
/ glp_DistributionTargetLevelsAxis
= glp_SecondTargetDistributionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Second Target Distribution | Common Unitholders        
Cash Distributions        
Marginal Percentage Interest in Distributions   86.26%glp_DistributionMadeToMemberOrLimitedPartnerCashDistributionsDeclaredMarginalPercentageInterestInDistributions
/ glp_DistributionTargetLevelsAxis
= glp_SecondTargetDistributionMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
   
Second Target Distribution | General Partner Interest        
Cash Distributions        
Marginal Percentage Interest in Distributions   13.74%glp_DistributionMadeToMemberOrLimitedPartnerCashDistributionsDeclaredMarginalPercentageInterestInDistributions
/ glp_DistributionTargetLevelsAxis
= glp_SecondTargetDistributionMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
   
Third Target Distribution        
Cash Distribution Payment        
Per Unit Cash Distribution (in dollars per unit)       $ 0.6650us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsPaidPerUnit
/ glp_DistributionTargetLevelsAxis
= glp_ThirdTargetDistributionMember
Third Target Distribution | Minimum        
Cash Distributions        
Total Quarterly Distribution Target Amount (in dollars per unit)   0.5375glp_DistributionMadeToMemberOrLimitedPartnerQuarterlyCashDistributionsTargetAmountPerUnit
/ glp_DistributionTargetLevelsAxis
= glp_ThirdTargetDistributionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Third Target Distribution | Maximum        
Cash Distributions        
Total Quarterly Distribution Target Amount (in dollars per unit)   0.6625glp_DistributionMadeToMemberOrLimitedPartnerQuarterlyCashDistributionsTargetAmountPerUnit
/ glp_DistributionTargetLevelsAxis
= glp_ThirdTargetDistributionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Third Target Distribution | Common Unitholders        
Cash Distributions        
Marginal Percentage Interest in Distributions   76.26%glp_DistributionMadeToMemberOrLimitedPartnerCashDistributionsDeclaredMarginalPercentageInterestInDistributions
/ glp_DistributionTargetLevelsAxis
= glp_ThirdTargetDistributionMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
   
Third Target Distribution | General Partner Interest        
Cash Distributions        
Marginal Percentage Interest in Distributions   23.74%glp_DistributionMadeToMemberOrLimitedPartnerCashDistributionsDeclaredMarginalPercentageInterestInDistributions
/ glp_DistributionTargetLevelsAxis
= glp_ThirdTargetDistributionMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
   
Thereafter | Minimum        
Cash Distributions        
Total Quarterly Distribution Target Amount (in dollars per unit)   0.6625glp_DistributionMadeToMemberOrLimitedPartnerQuarterlyCashDistributionsTargetAmountPerUnit
/ glp_DistributionTargetLevelsAxis
= glp_TargetDistributionThereafterMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Thereafter | Common Unitholders        
Cash Distributions        
Marginal Percentage Interest in Distributions   51.26%glp_DistributionMadeToMemberOrLimitedPartnerCashDistributionsDeclaredMarginalPercentageInterestInDistributions
/ glp_DistributionTargetLevelsAxis
= glp_TargetDistributionThereafterMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
   
Thereafter | General Partner Interest        
Cash Distributions        
Marginal Percentage Interest in Distributions   48.74%glp_DistributionMadeToMemberOrLimitedPartnerCashDistributionsDeclaredMarginalPercentageInterestInDistributions
/ glp_DistributionTargetLevelsAxis
= glp_TargetDistributionThereafterMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember