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Related Party Transactions Omnibus Agreement (Details) (Delek [Member], Omnibus Agreement [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Delek [Member] | Omnibus Agreement [Member]
    
Related Party Transaction [Line Items]    
Omnibus Agreement Annual Amount $ 3.4dkl_OmnibusAgreementAnnualAmount
/ us-gaap_RelatedPartyTransactionAxis
= dkl_OmnibusAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dkl_DelekUsMember		 $ 3.3dkl_OmnibusAgreementAnnualAmount
/ us-gaap_RelatedPartyTransactionAxis
= dkl_OmnibusAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dkl_DelekUsMember
Annual Maximum Tank Repair and Maintenance Expense $ 0.5dkl_AnnualMaximumTankRepairAndMaintenanceExpense
/ us-gaap_RelatedPartyTransactionAxis
= dkl_OmnibusAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dkl_DelekUsMember