XML 14 R48.htm IDEA: XBRL DOCUMENT v2.4.1.9
Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment information    
Segment purchased product costs $ 123,484us-gaap_NaturalGasMidstreamCosts $ 211,564us-gaap_NaturalGasMidstreamCosts
Segment facility expenses 91,816us-gaap_FacilityCosts 83,705us-gaap_FacilityCosts
Income from operations 52,532us-gaap_OperatingIncomeLoss 72,001us-gaap_OperatingIncomeLoss
Capital expenditures 438,271us-gaap_PaymentsToAcquirePropertyPlantAndEquipment 587,120us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Total segments    
Segment information    
Segment revenue 482,331us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
517,936us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Segment purchased product costs 123,484us-gaap_NaturalGasMidstreamCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
211,564us-gaap_NaturalGasMidstreamCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Net operating margin 358,847mwe_NetOperatingMargin
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
306,372mwe_NetOperatingMargin
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Segment facility expenses 100,771us-gaap_FacilityCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
85,389us-gaap_FacilityCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Segment portion of operating income (loss) attributable to non-controlling interests 21,654mwe_MinorityInterestInOperatingIncomeLossLimitedPartnerships
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
3,135mwe_MinorityInterestInOperatingIncomeLossLimitedPartnerships
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Income from operations 236,422us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
217,848us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Capital expenditures 535,567us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
582,525us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Intersegment Eliminations    
Segment information    
Segment revenue (44)us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
(1,571)us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
Net operating margin (44)mwe_NetOperatingMargin
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
(1,571)mwe_NetOperatingMargin
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
Segment facility expenses (44)us-gaap_FacilityCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
(1,571)us-gaap_FacilityCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
Adjustments for unconsolidated affiliates    
Segment information    
Segment portion of operating income (loss) attributable to non-controlling interests (10,240)mwe_MinorityInterestInOperatingIncomeLossLimitedPartnerships
/ us-gaap_ConsolidationItemsAxis
= mwe_AdjustmentsForUnconsolidatedAffiliatesMember
 
Capital expenditures (100,878)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= mwe_AdjustmentsForUnconsolidatedAffiliatesMember
 
Not allocated to segments    
Segment information    
Capital expenditures 3,582us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
4,595us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Marcellus | Total segments    
Segment information    
Segment revenue 197,176us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_MarcellusSegmentMember
175,159us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_MarcellusSegmentMember
Segment purchased product costs 6,502us-gaap_NaturalGasMidstreamCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_MarcellusSegmentMember
34,290us-gaap_NaturalGasMidstreamCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_MarcellusSegmentMember
Net operating margin 190,674mwe_NetOperatingMargin
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_MarcellusSegmentMember
140,869mwe_NetOperatingMargin
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_MarcellusSegmentMember
Segment facility expenses 43,382us-gaap_FacilityCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_MarcellusSegmentMember
35,473us-gaap_FacilityCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_MarcellusSegmentMember
Income from operations 147,292us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_MarcellusSegmentMember
105,396us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_MarcellusSegmentMember
Capital expenditures 314,559us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_MarcellusSegmentMember
360,598us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_MarcellusSegmentMember
Utica Segment | Total segments    
Segment information    
Segment revenue 58,911us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_UticaSegmentMember
23,766us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_UticaSegmentMember
Segment purchased product costs 181us-gaap_NaturalGasMidstreamCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_UticaSegmentMember
4,135us-gaap_NaturalGasMidstreamCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_UticaSegmentMember
Net operating margin 58,730mwe_NetOperatingMargin
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_UticaSegmentMember
19,631mwe_NetOperatingMargin
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_UticaSegmentMember
Segment facility expenses 16,638us-gaap_FacilityCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_UticaSegmentMember
11,852us-gaap_FacilityCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_UticaSegmentMember
Segment portion of operating income (loss) attributable to non-controlling interests 20,107mwe_MinorityInterestInOperatingIncomeLossLimitedPartnerships
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_UticaSegmentMember
3,136mwe_MinorityInterestInOperatingIncomeLossLimitedPartnerships
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_UticaSegmentMember
Income from operations 21,985us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_UticaSegmentMember
4,643us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_UticaSegmentMember
Capital expenditures 179,218us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_UticaSegmentMember
181,332us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_UticaSegmentMember
Utica Segment | Adjustments for unconsolidated affiliates    
Segment information    
Capital expenditures 97,900us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= mwe_AdjustmentsForUnconsolidatedAffiliatesMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_UticaSegmentMember
 
Northeast Segment | Total segments    
Segment information    
Segment revenue 30,021us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_NortheastSegmentMember
61,253us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_NortheastSegmentMember
Segment purchased product costs 12,518us-gaap_NaturalGasMidstreamCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_NortheastSegmentMember
20,455us-gaap_NaturalGasMidstreamCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_NortheastSegmentMember
Net operating margin 17,503mwe_NetOperatingMargin
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_NortheastSegmentMember
40,798mwe_NetOperatingMargin
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_NortheastSegmentMember
Segment facility expenses 6,878us-gaap_FacilityCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_NortheastSegmentMember
7,114us-gaap_FacilityCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_NortheastSegmentMember
Income from operations 10,625us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_NortheastSegmentMember
33,684us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_NortheastSegmentMember
Capital expenditures 1,205us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_NortheastSegmentMember
463us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_NortheastSegmentMember
Southwest Segment | Total segments    
Segment information    
Segment revenue 196,267us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_SouthwestSegmentMember
259,329us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_SouthwestSegmentMember
Segment purchased product costs 104,283us-gaap_NaturalGasMidstreamCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_SouthwestSegmentMember
152,684us-gaap_NaturalGasMidstreamCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_SouthwestSegmentMember
Net operating margin 91,984mwe_NetOperatingMargin
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_SouthwestSegmentMember
106,645mwe_NetOperatingMargin
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_SouthwestSegmentMember
Segment facility expenses 33,917us-gaap_FacilityCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_SouthwestSegmentMember
32,521us-gaap_FacilityCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_SouthwestSegmentMember
Segment portion of operating income (loss) attributable to non-controlling interests 1,547mwe_MinorityInterestInOperatingIncomeLossLimitedPartnerships
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_SouthwestSegmentMember
(1)mwe_MinorityInterestInOperatingIncomeLossLimitedPartnerships
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_SouthwestSegmentMember
Income from operations 56,520us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_SouthwestSegmentMember
74,125us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_SouthwestSegmentMember
Capital expenditures 40,585us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_SouthwestSegmentMember
40,132us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_SouthwestSegmentMember
Southwest Segment | Adjustments for unconsolidated affiliates    
Segment information    
Capital expenditures $ 3,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= mwe_AdjustmentsForUnconsolidatedAffiliatesMember
/ us-gaap_StatementBusinessSegmentsAxis
= mwe_SouthwestSegmentMember