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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

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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: