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Long-Term Obligations and Short-Term Note Payable Long Term Obligations (Details) (Revolving Credit Facility [Member], Fifth Third Bank [Member], USD $) | 12 Months Ended | 0 Months Ended |
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Dec. 31, 2014 | Dec. 30, 2014 | Jul. 09, 2013
Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum Borrowing Capacity |  | 700,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember | $ 400,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Maximum Borrowing Capacity under Accordion Feature |  | 800,000,000 dkl_MaximumBorrowingCapacityUnderAccordionFeature / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |
Weighted Average Interest Rate | 2.30%us-gaap_DebtWeightedAverageInterestRate / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |
Unused Capacity, Commitment Fee Percentage | 0.30%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |
Holdings Note outstanding amount | 102,000,000 dkl_RelatedPartyLimiitedGuarantyofDebt / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |
Line of Credit Facility, Amount Outstanding | 251,750,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |
Available borrowing capacity | 440,800,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |
Letter of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Amount Outstanding | 0 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember |  |
Letters of Credit | $ 7,500,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember |  |
United States of America, Dollars | Prime Rate [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis |  | U.S. dollar prime rate |
United States of America, Dollars | London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis |  | London Interbank Offered Rate |
Canada, Dollars | Canadian prime rate [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis |  | Canadian dollar prime rate |
Canada, Dollars | Canadian Dealer Offered Rate (CDOR) [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis |  | Canadian Dealer Offered Rate |

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- Definition Maximum Borrowing Capacity under Accordion Feature + References No definition available. + Details
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Namespace Prefix: | dkl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Related Party Limiited Guaranty of Debt + References No definition available. + Details
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Namespace Prefix: | dkl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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Period Type: | duration

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- Details
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- Details
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