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Transactions With Affiliates - Additional Information (details) (USD $)
3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
May 31, 2008
Dec. 31, 2014
Related Party Transaction [Line Items]        
Note receivable - Anadarko $ 260,000,000us-gaap_NotesReceivableRelatedPartiesNoncurrent     $ 260,000,000us-gaap_NotesReceivableRelatedPartiesNoncurrent [1]
Partners' capital adjustment (81,000)us-gaap_PartnersCapitalOther      
Western Gas Equity Partners Long Term Incentive Plan [Member]        
Related Party Transaction [Line Items]        
Phantom units vesting period 3 years      
Independent Director [Member] | Western Gas Equity Partners Long Term Incentive Plan [Member]        
Related Party Transaction [Line Items]        
Phantom units vesting period 1 year      
Equity-based compensation expense 55,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= wgp_WesternGasEquityPartnersLongTermIncentivePlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
27,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= wgp_WesternGasEquityPartnersLongTermIncentivePlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
   
Western Gas Partners [Member] | Western Gas Equity Partners Long Term Incentive Plan [Member] | Anadarko Incentive Plans [Member]        
Related Party Transaction [Line Items]        
Partners' capital adjustment 800,000us-gaap_PartnersCapitalOther
/ us-gaap_AwardTypeAxis
= wgp_AnadarkoIncentivePlansMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_PlanNameAxis
= wgp_WesternGasEquityPartnersLongTermIncentivePlanMember
     
Equity-based compensation expense 1,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= wgp_AnadarkoIncentivePlansMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_PlanNameAxis
= wgp_WesternGasEquityPartnersLongTermIncentivePlanMember
900,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= wgp_AnadarkoIncentivePlansMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_PlanNameAxis
= wgp_WesternGasEquityPartnersLongTermIncentivePlanMember
   
Western Gas Partners [Member] | Western Gas Partners Long Term Incentive Plan [Member]        
Related Party Transaction [Line Items]        
Phantom units vesting period 3 years      
Equity-based compensation expense 100,000us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_PlanNameAxis
= wgp_WesternGasPartnersLongTermIncentivePlanMember
100,000us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_PlanNameAxis
= wgp_WesternGasPartnersLongTermIncentivePlanMember
   
Western Gas Partners [Member] | Independent Director [Member] | Western Gas Partners Long Term Incentive Plan [Member]        
Related Party Transaction [Line Items]        
Phantom units vesting period 1 year      
Western Gas Partners [Member] | Note Receivable From Anadarko [Member]        
Related Party Transaction [Line Items]        
Note receivable - Anadarko     260,000,000.0us-gaap_NotesReceivableRelatedPartiesNoncurrent
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_RelatedPartyTransactionAxis
= wgp_NoteReceivableFromAnadarkoMember
 
Note receivable, due date May 14, 2038      
Fixed annual rate for note receivable bearing interest     6.50%us-gaap_ReceivableWithImputedInterestEffectiveYieldInterestRate
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_RelatedPartyTransactionAxis
= wgp_NoteReceivableFromAnadarkoMember
 
Fair value of the note receivable $ 327,000,000us-gaap_NotesReceivableFairValueDisclosure
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_RelatedPartyTransactionAxis
= wgp_NoteReceivableFromAnadarkoMember
    $ 317,800,000us-gaap_NotesReceivableFairValueDisclosure
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_RelatedPartyTransactionAxis
= wgp_NoteReceivableFromAnadarkoMember
Western Gas Partners [Member] | Gathering Transportation And Treating [Member]        
Related Party Transaction [Line Items]        
Affiliate throughput percent 48.00%wgp_AffiliateThroughputPercent
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_RelatedPartyTransactionAxis
= wgp_GatheringTransportationAndTreatingMember
49.00%wgp_AffiliateThroughputPercent
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_RelatedPartyTransactionAxis
= wgp_GatheringTransportationAndTreatingMember
   
Western Gas Partners [Member] | Processing [Member]        
Related Party Transaction [Line Items]        
Affiliate throughput percent 52.00%wgp_AffiliateThroughputPercent
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_RelatedPartyTransactionAxis
= wgp_ProcessingMember
59.00%wgp_AffiliateThroughputPercent
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
/ us-gaap_RelatedPartyTransactionAxis
= wgp_ProcessingMember
   
[1] Financial information has been recast to include the financial position and results attributable to the DBJV system. See Note 1 and Note 2.