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FAIR VALUE MEASUREMENTS (Detail 2) (Level 2, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Carrying Value    
Fair Value And Carrying Value By Balance Sheet Grouping    
Total debt $ 3,585,068us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 $ 3,554,986us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Carrying Value | Fixed Rate Debt    
Fair Value And Carrying Value By Balance Sheet Grouping    
Total debt 3,389,268us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= bpl_FixedRateDebtMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 3,388,986us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= bpl_FixedRateDebtMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Carrying Value | Variable Rate Debt    
Fair Value And Carrying Value By Balance Sheet Grouping    
Total debt 195,800us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= bpl_VariableRateDebtMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 166,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= bpl_VariableRateDebtMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value    
Fair Value And Carrying Value By Balance Sheet Grouping    
Total debt 3,706,648us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 3,631,973us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value | Fixed Rate Debt    
Fair Value And Carrying Value By Balance Sheet Grouping    
Total debt 3,510,848us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= bpl_FixedRateDebtMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 3,465,973us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= bpl_FixedRateDebtMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value | Variable Rate Debt    
Fair Value And Carrying Value By Balance Sheet Grouping    
Total debt $ 195,800us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= bpl_VariableRateDebtMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 $ 166,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= bpl_VariableRateDebtMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
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