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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	0.37500dkl_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	0.37500dkl_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	0.43125dkl_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	0.43125dkl_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	0.46875dkl_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	0.46875dkl_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	0.56250dkl_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	0.56250dkl_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

X

- Definition

Total quarterly distribution payment target amount

+ References

No definition available.

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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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X

- 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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X

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