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Equity Percentage Allocations of Available Cash from Operating Surplus (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
General partner's ownership interest | 2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest | 2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest | 2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
Minimum quarterly distribution [Member] |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution Payment Targets | 0.37500 dkl_DistributionPaymentTargets / dkl_IncentiveDistributionByTargetAxis = dkl_MinimumQuarterlyDistributionMember |  |
Minimum quarterly distribution [Member] | Limited Partner [Member] |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 98.00%dkl_IncentiveDistributionDistributionSplitMarginalPercentage / dkl_IncentiveDistributionByTargetAxis = dkl_MinimumQuarterlyDistributionMember / us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis = us-gaap_LimitedPartnerMember |  |
Minimum quarterly distribution [Member] | General Partner |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 2.00%dkl_IncentiveDistributionDistributionSplitMarginalPercentage / dkl_IncentiveDistributionByTargetAxis = dkl_MinimumQuarterlyDistributionMember / us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis = us-gaap_GeneralPartnerMember |  |
First target distribution [Member] | Limited Partner [Member] |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 98.00%dkl_IncentiveDistributionDistributionSplitMarginalPercentage / dkl_IncentiveDistributionByTargetAxis = dkl_FirstTargetDistributionMember / us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis = us-gaap_LimitedPartnerMember |  |
First target distribution [Member] | General Partner |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 2.00%dkl_IncentiveDistributionDistributionSplitMarginalPercentage / dkl_IncentiveDistributionByTargetAxis = dkl_FirstTargetDistributionMember / us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis = us-gaap_GeneralPartnerMember |  |
First target distribution [Member] | Minimum [Member] |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution Payment Targets | 0.37500 dkl_DistributionPaymentTargets / dkl_IncentiveDistributionByTargetAxis = dkl_FirstTargetDistributionMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
First target distribution [Member] | Maximum [Member] |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution Payment Targets | 0.43125 dkl_DistributionPaymentTargets / dkl_IncentiveDistributionByTargetAxis = dkl_FirstTargetDistributionMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Second target distribution [Member] | Limited Partner [Member] |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 85.00%dkl_IncentiveDistributionDistributionSplitMarginalPercentage / dkl_IncentiveDistributionByTargetAxis = dkl_SecondTargetDistributionMember / us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis = us-gaap_LimitedPartnerMember |  |
Second target distribution [Member] | General Partner |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 15.00%dkl_IncentiveDistributionDistributionSplitMarginalPercentage / dkl_IncentiveDistributionByTargetAxis = dkl_SecondTargetDistributionMember / us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis = us-gaap_GeneralPartnerMember |  |
Second target distribution [Member] | Minimum [Member] |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution Payment Targets | 0.43125 dkl_DistributionPaymentTargets / dkl_IncentiveDistributionByTargetAxis = dkl_SecondTargetDistributionMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Second target distribution [Member] | Maximum [Member] |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution Payment Targets | 0.46875 dkl_DistributionPaymentTargets / dkl_IncentiveDistributionByTargetAxis = dkl_SecondTargetDistributionMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Third target distribution [Member] | Limited Partner [Member] |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 75.00%dkl_IncentiveDistributionDistributionSplitMarginalPercentage / dkl_IncentiveDistributionByTargetAxis = dkl_ThirdTargetDistributionMember / us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis = us-gaap_LimitedPartnerMember |  |
Third target distribution [Member] | General Partner |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 25.00%dkl_IncentiveDistributionDistributionSplitMarginalPercentage / dkl_IncentiveDistributionByTargetAxis = dkl_ThirdTargetDistributionMember / us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis = us-gaap_GeneralPartnerMember |  |
Third target distribution [Member] | Minimum [Member] |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution Payment Targets | 0.46875 dkl_DistributionPaymentTargets / dkl_IncentiveDistributionByTargetAxis = dkl_ThirdTargetDistributionMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Third target distribution [Member] | Maximum [Member] |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution Payment Targets | 0.56250 dkl_DistributionPaymentTargets / dkl_IncentiveDistributionByTargetAxis = dkl_ThirdTargetDistributionMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Thereafter [Member] |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Distribution Payment Targets | 0.56250 dkl_DistributionPaymentTargets / dkl_IncentiveDistributionByTargetAxis = dkl_ThereafterMember |  |
Thereafter [Member] | Limited Partner [Member] |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 50.00%dkl_IncentiveDistributionDistributionSplitMarginalPercentage / dkl_IncentiveDistributionByTargetAxis = dkl_ThereafterMember / us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis = us-gaap_LimitedPartnerMember |  |
Thereafter [Member] | General Partner |  |  |
Incentive Distribution Made to Member or Limited Partner [Line Items] |  |  |
Marginal percentage interest in distributions | 50.00%dkl_IncentiveDistributionDistributionSplitMarginalPercentage / dkl_IncentiveDistributionByTargetAxis = dkl_ThereafterMember / us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis = us-gaap_GeneralPartnerMember |  |

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- Definition Total quarterly distribution payment target amount + References No definition available. + Details
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Namespace Prefix: | dkl_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage split between the limited partners' and general partner's interests in distributions. + References No definition available. + Details
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Namespace Prefix: | dkl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
Name: | dkl_IncentiveDistributionByTargetAxis=dkl_MinimumQuarterlyDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dkl_IncentiveDistributionByTargetAxis=dkl_SecondTargetDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dkl_IncentiveDistributionByTargetAxis=dkl_ThereafterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dkl_IncentiveDistributionByTargetAxis=dkl_ThirdTargetDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |