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Consolidated Statement of Equity and Partners' Capital (USD $)
In Thousands
Total
Western Gas Partners [Member]
Chipeta Processing Limited Liability Company [Member]
Net Investment by Anadarko [Member]
Common Units [Member]
Noncontrolling Interests [Member]
Noncontrolling Interests [Member]
Western Gas Partners [Member]
Noncontrolling Interests [Member]
Chipeta Processing Limited Liability Company [Member]
Balance at Dec. 31, 2014 [1] $ 4,133,859us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest     $ 122,509us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_ParentMember
$ 1,260,195us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= wgp_CommonUnitsMember
$ 2,751,155us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Net income (loss) 85,966us-gaap_ProfitLoss     1,742us-gaap_ProfitLoss
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_ParentMember
55,287us-gaap_ProfitLoss
/ us-gaap_PartnerCapitalComponentsAxis
= wgp_CommonUnitsMember
28,937us-gaap_ProfitLoss
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
WES equity transactions, net [2] 31,044us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance       (16,256)us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
/ us-gaap_PartnerCapitalComponentsAxis
= wgp_CommonUnitsMember
47,300us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Distributions to noncontrolling interest owners   (54,879)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
(3,150)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_BusinessAcquisitionAxis
= wgp_ChipetaProcessingLimitedLiabilityCompanyMember
      (54,879)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
(3,150)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_BusinessAcquisitionAxis
= wgp_ChipetaProcessingLimitedLiabilityCompanyMember
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
Distributions to WGP unitholders (68,409)us-gaap_PartnersCapitalAccountDistributions       (68,409)us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerCapitalComponentsAxis
= wgp_CommonUnitsMember
     
Acquisitions from affiliates (174,276)us-gaap_PartnersCapitalAccountAcquisitions     (196,191)us-gaap_PartnersCapitalAccountAcquisitions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_ParentMember
21,915us-gaap_PartnersCapitalAccountAcquisitions
/ us-gaap_PartnerCapitalComponentsAxis
= wgp_CommonUnitsMember
     
Contributions of equity-based compensation to WES by Anadarko 824wgp_ContributionsOfEquityBasedCompensationFromParent       824wgp_ContributionsOfEquityBasedCompensationFromParent
/ us-gaap_PartnerCapitalComponentsAxis
= wgp_CommonUnitsMember
     
Net pre-acquisition contributions from (distributions to) Anadarko 30,096us-gaap_PartnersCapitalAccountContributions     30,096us-gaap_PartnersCapitalAccountContributions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_ParentMember
       
Net distributions to Anadarko of other assets (348)us-gaap_PartnersCapitalAccountReturnOfCapital       (348)us-gaap_PartnersCapitalAccountReturnOfCapital
/ us-gaap_PartnerCapitalComponentsAxis
= wgp_CommonUnitsMember
     
Elimination of net deferred tax liabilities 41,844us-gaap_DeferredOtherTaxExpenseBenefit     41,844us-gaap_DeferredOtherTaxExpenseBenefit
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_ParentMember
       
Other (81)us-gaap_PartnersCapitalOther       (287)us-gaap_PartnersCapitalOther
/ us-gaap_PartnerCapitalComponentsAxis
= wgp_CommonUnitsMember
206us-gaap_PartnersCapitalOther
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Balance at Mar. 31, 2015 $ 4,022,490us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest     $ 0us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_ParentMember
$ 1,252,921us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= wgp_CommonUnitsMember
$ 2,769,569us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
[1] Financial information has been recast to include the financial position and results attributable to the DBJV system. See Note 1 and Note 2.
[2] Includes the impact of Western Gas Partners, LP’s public equity offerings as described in Note 4. The $16.3 million decrease to partners’ capital, together with net income attributable to Western Gas Equity Partners, LP, totaled $40.8 million for the three months ended March 31, 2015.