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      <ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
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 -Paragraph 25

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Accounting Research Bulletin (ARB)
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 -Paragraph 26

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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 -Paragraph A3
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      <ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Practice Bulletin (PB)
 -Number 14
 -Paragraph 10

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Emerging Issues Task Force (EITF)
 -Number 87-21

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      <ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Emerging Issues Task Force (EITF)
 -Number 87-21

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Practice Bulletin (PB)
 -Number 14
 -Paragraph 15

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 -Publisher SEC
 -Name Regulation S-X (SX)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Emerging Issues Task Force (EITF)
 -Number 87-21

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Practice Bulletin (PB)
 -Number 14
 -Paragraph 15

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Practice Bulletin (PB)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Emerging Issues Task Force (EITF)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
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 -Paragraph A3
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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 -Name Emerging Issues Task Force (EITF)
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      <ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Emerging Issues Task Force (EITF)
 -Number 87-21

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Practice Bulletin (PB)
 -Number 14
 -Paragraph 15

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          <NonNumericTextHeader />
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          <hasScenarios>false</hasScenarios>
          <DisplayDateInUSFormat>false</DisplayDateInUSFormat>
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      <OriginalInstanceReportColumns />
      <ElementDataType>xbrli:sharesItemType</ElementDataType>
      <SimpleDataType>shares</SimpleDataType>
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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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 -Name Emerging Issues Task Force (EITF)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
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 -Paragraph 15

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      <IsSegmentTitle>false</IsSegmentTitle>
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      <OriginalInstanceReportColumns />
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 -Publisher FASB
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 -Publisher SEC
 -Name Regulation S-X (SX)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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 -Name Emerging Issues Task Force (EITF)
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</ElementReferences>
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    <Row>
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      <Level>5</Level>
      <ElementName>us-gaap_PartnersCapitalAccountUnitsSoldInPublicOffering</ElementName>
      <ElementPrefix>us-gaap</ElementPrefix>
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      <ShortDefinition>No definition available.</ShortDefinition>
      <IsReportTitle>false</IsReportTitle>
      <IsSegmentTitle>false</IsSegmentTitle>
      <IsSubReportEnd>false</IsSubReportEnd>
      <IsCalendarTitle>false</IsCalendarTitle>
      <IsTuple>false</IsTuple>
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      <IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow>
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          <NumericAmount>4887000</NumericAmount>
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          <NumericAmount>0</NumericAmount>
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      <OriginalInstanceReportColumns />
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      <ElementDefenition>The number of units sold in a public offering of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners of a publicly listed limited partnership or a master limited partnership. This may include units of general, limited, and preferred partners of a publicly listed limited partnership or a master limited partnership. General partners have unlimited liability and manage the partnership. Limited partners have limited liability and do not manage the partnership.</ElementDefenition>
      <ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Emerging Issues Task Force (EITF)
 -Number 87-21

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Practice Bulletin (PB)
 -Number 14
 -Paragraph 15

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
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 -Paragraph 16
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</ElementReferences>
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      <ElementName>mwe_NoncontrollingInterestIncreaseFromContribution</ElementName>
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      <ElementReferences>No authoritative reference available.</ElementReferences>
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    <Row>
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 -Publisher AICPA
 -Name Accounting Research Bulletin (ARB)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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 -Name Accounting Research Bulletin (ARB)
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Accounting Research Bulletin (ARB)
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      <ElementDefenition>Total of Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity including portions attributable to both the parent and noncontrolling interests (previously referred to as minority interest), if any. The entity including portions attributable to the parent and noncontrolling interests is sometimes referred to as the economic entity. This excludes temporary equity and is sometimes called permanent equity.</ElementDefenition>
      <ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Accounting Research Bulletin (ARB)
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 -Paragraph 25

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Accounting Research Bulletin (ARB)
 -Number 51
 -Paragraph 26

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Accounting Research Bulletin (ARB)
 -Number 51
 -Paragraph A3
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      <ElementPrefix>us-gaap</ElementPrefix>
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 -Name Staff Accounting Bulletin (SAB)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Practice Bulletin (PB)
 -Number 14
 -Paragraph 10

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Emerging Issues Task Force (EITF)
 -Number 87-21

</ElementReferences>
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  <SharesShouldBeRounded>true</SharesShouldBeRounded>
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