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Equity Investments - Equity Investments Table (details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Balance $ 634,492us-gaap_EquityMethodInvestments [1]  
Investment earnings (loss), net of amortization 18,220us-gaap_IncomeLossFromEquityMethodInvestments [2],[3],[4] 9,251us-gaap_IncomeLossFromEquityMethodInvestments [1],[2],[3],[4]
Contributions 4,878us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates 28,462us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates [1]
Distributions (18,706)us-gaap_EquityMethodInvestmentDividendsOrDistributions [3] (10,269)us-gaap_EquityMethodInvestmentDividendsOrDistributions [1],[3]
Distributions in excess of cumulative earnings (2,964)us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital [3],[5] (2,044)us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital [1],[3]
Balance 635,920us-gaap_EquityMethodInvestments  
Western Gas Partners [Member] | Fort Union [Member]    
Schedule of Equity Method Investments [Line Items]    
Balance 25,933us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_FortUnionMember
 
Investment earnings (loss), net of amortization 1,555us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_FortUnionMember
 
Contributions 0us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_FortUnionMember
 
Distributions (948)us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_FortUnionMember
 
Distributions in excess of cumulative earnings 0us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_FortUnionMember
[5]  
Balance 26,540us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_FortUnionMember
 
Western Gas Partners [Member] | White Cliffs [Member]    
Schedule of Equity Method Investments [Line Items]    
Balance 44,315us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_WhiteCliffsMember
 
Investment earnings (loss), net of amortization 3,980us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_WhiteCliffsMember
 
Contributions 2,917us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_WhiteCliffsMember
 
Distributions (3,834)us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_WhiteCliffsMember
 
Distributions in excess of cumulative earnings (902)us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_WhiteCliffsMember
[5]  
Balance 46,476us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_WhiteCliffsMember
 
Western Gas Partners [Member] | Rendezvous [Member]    
Schedule of Equity Method Investments [Line Items]    
Balance 56,336us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_RendezvousMember
 
Investment earnings (loss), net of amortization 377us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_RendezvousMember
 
Contributions 0us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_RendezvousMember
 
Distributions (862)us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_RendezvousMember
 
Distributions in excess of cumulative earnings (736)us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_RendezvousMember
[5]  
Balance 55,115us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_RendezvousMember
 
Western Gas Partners [Member] | Mont Belvieu Joint Venture [Member]    
Schedule of Equity Method Investments [Line Items]    
Balance 121,337us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_MontBelvieuJointVentureMember
 
Investment earnings (loss), net of amortization 5,791us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_MontBelvieuJointVentureMember
 
Contributions (432)us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_MontBelvieuJointVentureMember
 
Distributions (6,291)us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_MontBelvieuJointVentureMember
 
Distributions in excess of cumulative earnings 0us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_MontBelvieuJointVentureMember
[5]  
Balance 120,405us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_MontBelvieuJointVentureMember
 
Western Gas Partners [Member] | Texas Express Gathering Limited Liability Company [Member]    
Schedule of Equity Method Investments [Line Items]    
Balance 16,790us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_TexasExpressGatheringLimitedLiabilityCompanyMember
 
Investment earnings (loss), net of amortization 190us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_TexasExpressGatheringLimitedLiabilityCompanyMember
 
Contributions 0us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_TexasExpressGatheringLimitedLiabilityCompanyMember
 
Distributions (337)us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_TexasExpressGatheringLimitedLiabilityCompanyMember
 
Distributions in excess of cumulative earnings 0us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_TexasExpressGatheringLimitedLiabilityCompanyMember
[5]  
Balance 16,643us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_TexasExpressGatheringLimitedLiabilityCompanyMember
 
Western Gas Partners [Member] | Texas Express Pipeline Limited Liability Company [Member]    
Schedule of Equity Method Investments [Line Items]    
Balance 198,793us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_TexasExpressPipelineLimitedLiabilityCompanyMember
 
Investment earnings (loss), net of amortization 3,616us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_TexasExpressPipelineLimitedLiabilityCompanyMember
 
Contributions 1,180us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_TexasExpressPipelineLimitedLiabilityCompanyMember
 
Distributions (3,679)us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_TexasExpressPipelineLimitedLiabilityCompanyMember
 
Distributions in excess of cumulative earnings (581)us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_TexasExpressPipelineLimitedLiabilityCompanyMember
[5]  
Balance 199,329us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_TexasExpressPipelineLimitedLiabilityCompanyMember
 
Western Gas Partners [Member] | Front Range Pipeline Limited Liability Company [Member]    
Schedule of Equity Method Investments [Line Items]    
Balance 170,988us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_FrontRangePipelineLimitedLiabilityCompanyMember
 
Investment earnings (loss), net of amortization 2,711us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_FrontRangePipelineLimitedLiabilityCompanyMember
 
Contributions 1,213us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_FrontRangePipelineLimitedLiabilityCompanyMember
 
Distributions (2,755)us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_FrontRangePipelineLimitedLiabilityCompanyMember
 
Distributions in excess of cumulative earnings (745)us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_FrontRangePipelineLimitedLiabilityCompanyMember
[5]  
Balance $ 171,412us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wgp_FrontRangePipelineLimitedLiabilityCompanyMember
 
[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] Represents amounts earned or incurred on and subsequent to the date of acquisition of WES assets, as well as amounts earned or incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES, recognized under gathering, treating or processing agreements, and purchase and sale agreements.
[3] Income earned on, distributions from and contributions to equity investments are classified as affiliate. See Note 1.
[4] Income earned from equity investments is classified as affiliate. See Note 1.
[5] Distributions in excess of cumulative earnings, classified as investing cash flows in the consolidated statements of cash flows, is calculated on an individual investment basis.