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PARTNERS' CAPITAL AND DISTRIBUTIONS (Detail 2) (Limited Partners)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Partner's capital and distributions    
Beginning Balance   127,043us-gaap_PartnersCapitalAccountUnits
Ending Balance 127,285us-gaap_PartnersCapitalAccountUnits 127,043us-gaap_PartnersCapitalAccountUnits
Equity Distribution Agreements
    
Partner's capital and distributions    
Issuance of LP Units through Equity Distribution Agreements 49bpl_PartnersCapitalAccountUnitsSoldThroughEquityDistributionAgreements
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
/ us-gaap_TransactionTypeAxis
= bpl_EquityDistributionAgreementMember		  
Option Plan
    
Partner's capital and distributions    
LP Units issued 2us-gaap_PartnersCapitalAccountUnitsUnitbasedCompensation
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
/ us-gaap_PlanNameAxis
= bpl_UnitOptionAndDistributionEquivalentPlanMember		  
Long Term Incentive Plan 2009
    
Partner's capital and distributions    
LP Units issued 191us-gaap_PartnersCapitalAccountUnitsUnitbasedCompensation
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
/ us-gaap_PlanNameAxis
= bpl_LongTermIncentivePlanTwentyZeroNineMember