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Equity (Distributions) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 9 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Mar. 31, 2015
Mar. 31, 2015
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Cash distributions declared per common unit $ 0us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit $ 0.3175us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit $ 0.3075us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit $ 0.2975us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit $ 0.2407us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit $ 1.1632us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit $ 0us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit      
Dividend Arrearges, Common Limited Partner Units     $ 0wnr_DividendArreargesCommonLimitedPartnerUnits         0wnr_DividendArreargesCommonLimitedPartnerUnits    
General Partner [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Incentive Cash Distribution Allocation     100.00%wnr_IncentiveCashDistributionAllocation
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= us-gaap_GeneralPartnerMember		         100.00%wnr_IncentiveCashDistributionAllocation
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= us-gaap_GeneralPartnerMember		    
Minimum Quarterly Distribution [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Distribution Payment Targets               $0.2875    
Minimum Quarterly Distribution [Member] | General Partner [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Incentive Distribution, Distribution Split Marginal Percentage               0.00%wnr_IncentiveDistributionDistributionSplitMarginalPercentage
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= wnr_MinimumQuarterlyDistributionMember
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= us-gaap_GeneralPartnerMember		    
Minimum Quarterly Distribution [Member] | Limited Partner [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Incentive Distribution, Distribution Split Marginal Percentage               100.00%wnr_IncentiveDistributionDistributionSplitMarginalPercentage
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= wnr_MinimumQuarterlyDistributionMember
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= us-gaap_LimitedPartnerMember		    
First Target Distribution [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Distribution Payment Targets               above $0.2875 up to $0.3306    
First Target Distribution [Member] | General Partner [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Incentive Distribution, Distribution Split Marginal Percentage               0.00%wnr_IncentiveDistributionDistributionSplitMarginalPercentage
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= wnr_FirstTargetDistributionMember
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= us-gaap_GeneralPartnerMember		    
First Target Distribution [Member] | Limited Partner [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Incentive Distribution, Distribution Split Marginal Percentage               100.00%wnr_IncentiveDistributionDistributionSplitMarginalPercentage
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= wnr_FirstTargetDistributionMember
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= us-gaap_LimitedPartnerMember		    
Second Target Distribution [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Distribution Payment Targets               above $0.3306 up to $0.3594    
Second Target Distribution [Member] | General Partner [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Incentive Distribution, Distribution Split Marginal Percentage               15.00%wnr_IncentiveDistributionDistributionSplitMarginalPercentage
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= wnr_SecondTargetDistributionMember
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= us-gaap_GeneralPartnerMember		    
Second Target Distribution [Member] | Limited Partner [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Incentive Distribution, Distribution Split Marginal Percentage               85.00%wnr_IncentiveDistributionDistributionSplitMarginalPercentage
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= wnr_SecondTargetDistributionMember
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= us-gaap_LimitedPartnerMember		    
Third Target Distribution [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Distribution Payment Targets               above $0.3594 up to $0.4313    
Third Target Distribution [Member] | General Partner [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Incentive Distribution, Distribution Split Marginal Percentage               25.00%wnr_IncentiveDistributionDistributionSplitMarginalPercentage
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= wnr_ThirdTargetDistributionMember
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= us-gaap_GeneralPartnerMember		    
Third Target Distribution [Member] | Limited Partner [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Incentive Distribution, Distribution Split Marginal Percentage               75.00%wnr_IncentiveDistributionDistributionSplitMarginalPercentage
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= wnr_ThirdTargetDistributionMember
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= us-gaap_LimitedPartnerMember		    
Target Distribution After Third Target [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Distribution Payment Targets               above $0.4313    
Target Distribution After Third Target [Member] | General Partner [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Incentive Distribution, Distribution Split Marginal Percentage               50.00%wnr_IncentiveDistributionDistributionSplitMarginalPercentage
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= wnr_TargetDistributionAfterThirdTargetMember
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= us-gaap_GeneralPartnerMember		    
Target Distribution After Third Target [Member] | Limited Partner [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Incentive Distribution, Distribution Split Marginal Percentage               50.00%wnr_IncentiveDistributionDistributionSplitMarginalPercentage
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= wnr_TargetDistributionAfterThirdTargetMember
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= us-gaap_LimitedPartnerMember		    
Subsequent Event [Member]                    
Incentive Distribution Made to Managing Member or General Partner [Line Items]                    
Cash distributions declared per common unit                 $ 0.3325us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Distribution Made to Limited Partner, Distributions Paid, Per Unit                   $ 1.2550us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember