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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013
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Fair Value Measurements [Abstract] |
Assets, Fair Value Disclosure, Recurring | $ 0.2

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- Details
Name: | dkl_FairValueMeasurementsAbstract
Namespace Prefix: | dkl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant