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Goodwill (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill, Impairment Loss | $ 11,700,000 us-gaap_GoodwillImpairmentLoss |  | $ 0 us-gaap_GoodwillImpairmentLoss |  | $ 0 us-gaap_GoodwillImpairmentLoss
Goodwill [Roll Forward] |  |  |  |  |
Beginning Balance | 11,654,000 us-gaap_Goodwill | [1] | 10,454,000 us-gaap_Goodwill |  | 7,499,000 us-gaap_Goodwill
Acquisitions |  |  | 1,200,000 us-gaap_GoodwillAcquiredDuringPeriod |  | 2,955,000 us-gaap_GoodwillAcquiredDuringPeriod
Ending Balance | 11,654,000 us-gaap_Goodwill |  | 11,654,000 us-gaap_Goodwill | [1] | 10,454,000 us-gaap_Goodwill
Wholesale Marketing and Terminalling |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | 7,499,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember |  | 7,499,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember
Acquisitions |  |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember
Ending Balance | 7,499,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember |  | 7,499,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember |  | 7,499,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember
Pipelines and Transportation |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | 2,955,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember |  | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember
Acquisitions |  |  | 1,200,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember |  | 2,955,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember
Ending Balance | $ 4,155,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember |  | $ 4,155,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember |  | $ 2,955,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember
[1] | Includes the historical balances of the El Dorado Terminal and Tank Assets. See Notes 1 and 3 for further discussion.

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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