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Acquisitions El Dorado and Tyler Acquisitions (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Jul. 26, 2013
bbl
Dec. 31, 2014
Feb. 10, 2014
bbl
Dec. 31, 2013
Tyler Terminal and Tanks [Member]        
Business Acquisition [Line Items]        
Cash paid for acquisition $ 94,800,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= dkl_TylerTerminalandTanksMember
$ 94,800,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= dkl_TylerTerminalandTanksMember
   
Total Throughput Capacity (bpd) 72,000dkl_TotalThroughputCapacity
/ us-gaap_BusinessAcquisitionAxis
= dkl_TylerTerminalandTanksMember
     
Number of Storage Tanks 96dkl_NumberofStorageTanks
/ us-gaap_BusinessAcquisitionAxis
= dkl_TylerTerminalandTanksMember
     
Aggregate Shell Capacity (barrels) 2,000,000dkl_AggregateShellCapacity
/ us-gaap_BusinessAcquisitionAxis
= dkl_TylerTerminalandTanksMember
     
Historical carrying value of assets 38,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= dkl_TylerTerminalandTanksMember
     
El Dorado Terminal and Tanks [Member]        
Business Acquisition [Line Items]        
Cash paid for acquisition     95,900,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= dkl_ElDoradoTerminalandTanksMember
95,900,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= dkl_ElDoradoTerminalandTanksMember
Total Throughput Capacity (bpd)     26,700dkl_TotalThroughputCapacity
/ us-gaap_BusinessAcquisitionAxis
= dkl_ElDoradoTerminalandTanksMember
 
Number of Storage Tanks     158dkl_NumberofStorageTanks
/ us-gaap_BusinessAcquisitionAxis
= dkl_ElDoradoTerminalandTanksMember
 
Aggregate Shell Capacity (barrels)     2,500,000dkl_AggregateShellCapacity
/ us-gaap_BusinessAcquisitionAxis
= dkl_ElDoradoTerminalandTanksMember
 
Historical carrying value of assets     25,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= dkl_ElDoradoTerminalandTanksMember
 
Total operating revenues   15,809,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= dkl_ElDoradoTerminalandTanksMember
   
Net income attributable to the Partnership   10,481,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= dkl_ElDoradoTerminalandTanksMember
   
General and Administrative Expense [Member] | El Dorado Terminal and Tanks [Member]        
Business Acquisition [Line Items]        
Costs associated with the acquisition   $ 186,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= dkl_ElDoradoTerminalandTanksMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember