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Segment Information (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment information    
Income from operations $ 52,532us-gaap_OperatingIncomeLoss $ 72,001us-gaap_OperatingIncomeLoss
Revenue 467,330us-gaap_Revenues 512,476us-gaap_Revenues
Selling, general and administrative expenses (34,635)us-gaap_SellingGeneralAndAdministrativeExpense (35,290)us-gaap_SellingGeneralAndAdministrativeExpense
Depreciation (119,592)us-gaap_Depreciation (101,929)us-gaap_Depreciation
Amortization of intangible assets (15,826)us-gaap_AmortizationOfIntangibleAssets (15,978)us-gaap_AmortizationOfIntangibleAssets
Impairment expense (25,523)us-gaap_AssetImpairmentCharges 0us-gaap_AssetImpairmentCharges
Gain on disposal of property, plant and equipment 811us-gaap_GainLossOnDispositionOfAssets 93us-gaap_GainLossOnDispositionOfAssets
Accretion of asset retirement obligations (193)us-gaap_AssetRetirementObligationAccretionExpense (168)us-gaap_AssetRetirementObligationAccretionExpense
Earnings from unconsolidated affiliates 512us-gaap_IncomeLossFromEquityMethodInvestments 250us-gaap_IncomeLossFromEquityMethodInvestments
Interest expense (50,057)us-gaap_InterestExpense (40,984)us-gaap_InterestExpense
Amortization of deferred financing costs and debt discount (a component of interest expense) (1,635)us-gaap_AmortizationOfFinancingCostsAndDiscounts (2,824)us-gaap_AmortizationOfFinancingCostsAndDiscounts
Miscellaneous income, net 48us-gaap_OtherNonoperatingIncomeExpense 19us-gaap_OtherNonoperatingIncomeExpense
Income before provision for income tax 1,400us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 28,462us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Total segments    
Segment information    
Income from operations 236,422us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
217,848us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Portion of operating income attributable to non-controlling interests (21,654)mwe_MinorityInterestInOperatingIncomeLossLimitedPartnerships
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
(3,135)mwe_MinorityInterestInOperatingIncomeLossLimitedPartnerships
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Reconciling adjustments    
Segment information    
Portion of operating income attributable to non-controlling interests 11,414mwe_MinorityInterestInOperatingIncomeLossLimitedPartnerships
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
3,135mwe_MinorityInterestInOperatingIncomeLossLimitedPartnerships
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
Revenue deferral adjustment (922)mwe_DeferredRevenueAdjustmentAndManagementFeeRevenueExcludingUnconsolidatedAffiliate
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
(1,493)mwe_DeferredRevenueAdjustmentAndManagementFeeRevenueExcludingUnconsolidatedAffiliate
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
Facility expenses adjustments 2,688mwe_FacilityExpensesAdjustments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
2,688mwe_FacilityExpensesAdjustments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
Adjustments for unconsolidated affiliates    
Segment information    
Portion of operating income attributable to non-controlling interests 10,240mwe_MinorityInterestInOperatingIncomeLossLimitedPartnerships
/ us-gaap_ConsolidationItemsAxis
= mwe_AdjustmentsForUnconsolidatedAffiliatesMember
 
Revenue (27,531)us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= mwe_AdjustmentsForUnconsolidatedAffiliatesMember
 
Facility expense, operational service fees and purchased product cost adjustments 13,458mwe_FacilityExpenseOperationalServiceFeeAndPurchasedProductCostAdjustments
/ us-gaap_ConsolidationItemsAxis
= mwe_AdjustmentsForUnconsolidatedAffiliatesMember
 
Not allocated to segments    
Segment information    
Derivative gain not allocated to segments 2,828us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
4,099us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Compensation expense included in facility expenses not allocated to segments (1,107)mwe_FacilityCostsLaborAndRelatedExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
(1,004)mwe_FacilityCostsLaborAndRelatedExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Selling, general and administrative expenses (34,635)us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
(35,290)us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Depreciation (119,592)us-gaap_Depreciation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
(101,929)us-gaap_Depreciation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Amortization of intangible assets (15,826)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
(15,978)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Gain on disposal of property, plant and equipment 811us-gaap_GainLossOnDispositionOfAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
93us-gaap_GainLossOnDispositionOfAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Accretion of asset retirement obligations $ (193)us-gaap_AssetRetirementObligationAccretionExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
$ (168)us-gaap_AssetRetirementObligationAccretionExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember