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Derivative Instruments - Narrative (Details) - USD ($) $ in Millions |  |  | 9 Months Ended
--- | --- | --- | ---
Feb. 25, 2013 | Nov. 07, 2012 | Sep. 30, 2017
Derivative [Line Items] |  |  |
Minimum required percent of interest rate hedging arrangements for credit facility (as percent) |  | 50.00% |
Minimum period to maintain required 50% of the amount funded |  | 3 years |
Interest Rate Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Term of contract (less than 90 days for forward fuel contracts) | 3 years |  |
Notional amount | $ 45.0 |  |
Fuel [Member] | Forward Contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Term of contract (less than 90 days for forward fuel contracts) |  |  | 90 days

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- Definition Line of Credit, Covenant, Minimum Period to Maintain Required Percent of Amount Funded for Interest Rate Hedging Arrangement + References No definition available. + Details
Name: | dkl_LineofCreditCovenantMinimumPeriodtoMaintainRequiredPercentofAmountFundedforInterestRateHedgingArrangement
Namespace Prefix: | dkl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of Credit, Covenant, Minimum Required Percent of Interest Rate Hedging Arrangements + References No definition available. + Details
Name: | dkl_LineofCreditCovenantMinimumRequiredPercentofInterestRateHedgingArrangements
Namespace Prefix: | dkl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DerivativeTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnergyAxis=us-gaap_FuelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForwardContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |