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Segment Data (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]                      
Affiliate                 $ 114,583us-gaap_RevenueFromRelatedParties [1],[2] $ 78,173us-gaap_RevenueFromRelatedParties [1],[2],[3] $ 43,614us-gaap_RevenueFromRelatedParties [3],[4],[5]
Third Party                 726,670us-gaap_SalesRevenueServicesNet [1],[2] 829,255us-gaap_SalesRevenueServicesNet [1],[2],[3] 978,972us-gaap_SalesRevenueServicesNet [3],[4],[5]
Total Pipelines and Transportation 173,347us-gaap_SalesRevenueNet 228,036us-gaap_SalesRevenueNet 236,343us-gaap_SalesRevenueNet 203,527us-gaap_SalesRevenueNet [6] 223,097us-gaap_SalesRevenueNet [7] 243,295us-gaap_SalesRevenueNet [6],[7] 230,141us-gaap_SalesRevenueNet [6],[7] 210,894us-gaap_SalesRevenueNet [6],[7] 841,253us-gaap_SalesRevenueNet [4],[5] 907,428us-gaap_SalesRevenueNet [1],[2],[3] 1,022,586us-gaap_SalesRevenueNet [1],[2],[3]
Operating Costs and Expenses [Abstract]                      
Cost of goods sold                 697,221us-gaap_CostOfGoodsSold [4],[5] 811,364us-gaap_CostOfGoodsSold [1],[2],[3] 959,434us-gaap_CostOfGoodsSold [1],[2],[3]
Operating expenses                 38,786us-gaap_OperatingCostsAndExpenses [4],[5] 35,640us-gaap_OperatingCostsAndExpenses [1],[2],[3] 39,420us-gaap_OperatingCostsAndExpenses [1],[2],[3]
Segment Contribution Margin                 105,246dkl_SegmentContributionMargin [4],[5] 60,424dkl_SegmentContributionMargin [1],[2] 23,732dkl_SegmentContributionMargin [1],[2]
General and administrative expenses                 10,616us-gaap_SellingGeneralAndAdministrativeExpense [4],[5] 7,526us-gaap_SellingGeneralAndAdministrativeExpense [1],[2],[3] 9,856us-gaap_SellingGeneralAndAdministrativeExpense [1],[2],[3]
Depreciation and amortization                 14,705us-gaap_DepreciationAndAmortization [4],[5] 13,738us-gaap_DepreciationAndAmortization [1],[2],[3],[8] 11,343us-gaap_DepreciationAndAmortization [1],[2],[3],[8]
Loss on asset disposals                 83us-gaap_GainLossOnDispositionOfAssets [4],[5] 166us-gaap_GainLossOnDispositionOfAssets [1],[2],[3],[8] 9us-gaap_GainLossOnDispositionOfAssets [1],[2],[3],[8]
Operating income 22,118us-gaap_OperatingIncomeLoss 17,488us-gaap_OperatingIncomeLoss 24,377us-gaap_OperatingIncomeLoss 15,859us-gaap_OperatingIncomeLoss [6] 12,355us-gaap_OperatingIncomeLoss [7] 10,986us-gaap_OperatingIncomeLoss [6],[7] 7,443us-gaap_OperatingIncomeLoss [6],[7] 8,210us-gaap_OperatingIncomeLoss [6],[7] 79,842us-gaap_OperatingIncomeLoss [3],[4],[5] 38,994us-gaap_OperatingIncomeLoss [1],[2],[3] 2,524us-gaap_OperatingIncomeLoss [1],[2],[3]
Total assets 311,839us-gaap_Assets       301,344us-gaap_Assets [9]       311,839us-gaap_Assets 301,344us-gaap_Assets [9]  
Capital spending (excluding business combinations)                 7,132us-gaap_PaymentsToAcquirePropertyPlantAndEquipment [4],[5] 12,662us-gaap_PaymentsToAcquirePropertyPlantAndEquipment [1],[2],[8] 30,816us-gaap_PaymentsToAcquirePropertyPlantAndEquipment [1],[2],[8]
Pipelines and Transportation                      
Segment Reporting Information [Line Items]                      
Affiliate                 80,683us-gaap_RevenueFromRelatedParties
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [1],[2] 51,878us-gaap_RevenueFromRelatedParties
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [1],[2] 30,145us-gaap_RevenueFromRelatedParties
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [4],[5]
Third Party                 10,665us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [1],[2] 8,359us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [1],[2] 3,394us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [4],[5]
Total Pipelines and Transportation                 91,348us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [4],[5] 60,237us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [1],[2] 33,539us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [1],[2]
Operating Costs and Expenses [Abstract]                      
Cost of goods sold                 4,294us-gaap_CostOfGoodsSold
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [4],[5] 764us-gaap_CostOfGoodsSold
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [1],[2] 0us-gaap_CostOfGoodsSold
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [1],[2]
Operating expenses                 31,300us-gaap_OperatingCostsAndExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [4],[5] 27,465us-gaap_OperatingCostsAndExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [1],[2] 32,359us-gaap_OperatingCostsAndExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [1],[2]
Segment Contribution Margin                 55,754dkl_SegmentContributionMargin
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [4],[5] 32,008dkl_SegmentContributionMargin
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [1],[2] 1,180dkl_SegmentContributionMargin
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [1],[2]
Total assets 210,846us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		       195,984us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		       210,846us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 195,984us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		  
Capital spending (excluding business combinations)                 3,768us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [4],[5] 9,621us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [1],[2] 23,845us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_PipelinesAndTransportationMember		 [1],[2]
Wholesale Marketing and Terminalling                      
Segment Reporting Information [Line Items]                      
Affiliate                 33,900us-gaap_RevenueFromRelatedParties
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [1],[2] 26,295us-gaap_RevenueFromRelatedParties
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [1],[2] 13,469us-gaap_RevenueFromRelatedParties
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [4],[5]
Third Party                 716,005us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [1],[2] 820,896us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [1],[2] 975,578us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [4],[5]
Total Pipelines and Transportation                 749,905us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [4],[5] 847,191us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [1],[2] 989,047us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [1],[2]
Operating Costs and Expenses [Abstract]                      
Cost of goods sold                 692,927us-gaap_CostOfGoodsSold
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [4],[5] 810,600us-gaap_CostOfGoodsSold
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [1],[2] 959,434us-gaap_CostOfGoodsSold
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [1],[2]
Operating expenses                 7,486us-gaap_OperatingCostsAndExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [4],[5] 8,175us-gaap_OperatingCostsAndExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [1],[2] 7,061us-gaap_OperatingCostsAndExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [1],[2]
Segment Contribution Margin                 49,492dkl_SegmentContributionMargin
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [4],[5] 28,416dkl_SegmentContributionMargin
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [1],[2] 22,552dkl_SegmentContributionMargin
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [1],[2]
Total assets 100,993us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		       105,360us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		       100,993us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 105,360us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		  
Capital spending (excluding business combinations)                 $ 3,364us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [4],[5] $ 3,041us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [1],[2] $ 6,971us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= dkl_WholesaleMarketingAndTerminallingMember		 [1],[2]
[1] Capital spending includes expenditures incurred in connection with the assets acquired in the El Dorado Acquisition
[2] The information presented includes the results of operations of the El Dorado Terminal and Tank Assets. Prior to the El Dorado Acquisition, the El Dorado Predecessor did not record all revenues for intercompany gathering, pipeline transportation, terminalling and storage services.
[3] Adjusted to include the historical results of the El Dorado Terminal and Tank Assets. See Notes 1 and 3 for further discussion.
[4] The information presented includes the results of operations of the El Dorado Terminal and Tank Assets and the Tyler Terminal and Tank Assets. Prior to the El Dorado Acquisition and the Tyler Acquisition, the El Dorado Predecessor and the Tyler Predecessor did not record all revenues for intercompany gathering, pipeline transportation, terminalling and storage services.
[5] Capital spending includes expenditures incurred in connection with the assets acquired in the El Dorado Acquisition and the Tyler Acquisition.
[6] The information presented includes the results of operations of the El Dorado Predecessor and the Tyler Predecessor
[7] The information presented includes the results of operations of the El Dorado Predecessor.
[8] Adjusted to include the historical cash flows of the El Dorado Terminal and Tank Assets. See Notes 1 and 3 for further discussion.
[9] Includes the historical balances of the El Dorado Terminal and Tank Assets. See Notes 1 and 3 for further discussion.