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Debt and Interest Expense - Debt Outstanding Table (details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Carrying value $ 2,422,954,000us-gaap_LongTermDebtNoncurrent $ 1,418,169,000us-gaap_LongTermDebtNoncurrent
Fair value 2,511,253,000us-gaap_DebtInstrumentFairValue [1] 1,422,840,000us-gaap_DebtInstrumentFairValue [1]
Total long-term debt principal 2,430,000,000us-gaap_DebtInstrumentCarryingAmount 1,420,000,000us-gaap_DebtInstrumentCarryingAmount
Western Gas Partners [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Principal 510,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
Carrying value 510,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 0us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
Fair value 510,000,000us-gaap_DebtInstrumentFairValue
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 [1] 0us-gaap_DebtInstrumentFairValue
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 [1]
Western Gas Partners [Member] | Senior Notes 5 Point 375 Percent Due 2021 [Member]    
Debt Instrument [Line Items]    
Principal 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes5Point375PercentDue2021Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes5Point375PercentDue2021Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
Carrying value 495,714,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes5Point375PercentDue2021Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 495,173,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes5Point375PercentDue2021Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
Fair value 549,530,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes5Point375PercentDue2021Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 [1] 533,615,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes5Point375PercentDue2021Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 [1]
Western Gas Partners [Member] | Senior Notes 4 Percent Due 2022 [Member]    
Debt Instrument [Line Items]    
Principal 670,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes4PercentDue2022Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 670,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes4PercentDue2022Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
Carrying value 672,930,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes4PercentDue2022Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 673,278,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes4PercentDue2022Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
Fair value 681,942,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes4PercentDue2022Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 [1] 641,237,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes4PercentDue2022Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 [1]
Western Gas Partners [Member] | Senior Notes 2 Point 6 Percent Due 2018 [Member]    
Debt Instrument [Line Items]    
Principal 350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes2Point6PercentDue2018Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes2Point6PercentDue2018Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
Carrying value 350,474,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes2Point6PercentDue2018Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 249,718,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes2Point6PercentDue2018Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
Fair value 352,162,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes2Point6PercentDue2018Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 [1] 247,988,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes2Point6PercentDue2018Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 [1]
Western Gas Partners [Member] | Senior Notes 5 Point 45 Percent Due 2044 [Member]    
Debt Instrument [Line Items]    
Principal 400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes5Point45PercentDue2044Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes5Point45PercentDue2044Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
Carrying value 393,836,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes5Point45PercentDue2044Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 0us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes5Point45PercentDue2044Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
Fair value 417,619,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes5Point45PercentDue2044Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 [1] 0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= wgp_SeniorNotes5Point45PercentDue2044Member
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 [1]
Anadarko [Member]    
Debt Instrument [Line Items]    
Current portion of long-term debt - Anadarko 1,150,000us-gaap_ShortTermBorrowings
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wgp_AnadarkoMember		 0us-gaap_ShortTermBorrowings
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wgp_AnadarkoMember
Anadarko [Member] | Working Capital Facility [Member]    
Debt Instrument [Line Items]    
Principal 1,150,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= wgp_WorkingCapitalFacilityMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wgp_AnadarkoMember		 0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= wgp_WorkingCapitalFacilityMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wgp_AnadarkoMember
Current portion of long-term debt - Anadarko 1,150,000us-gaap_ShortTermBorrowings
/ us-gaap_CreditFacilityAxis
= wgp_WorkingCapitalFacilityMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wgp_AnadarkoMember		 0us-gaap_ShortTermBorrowings
/ us-gaap_CreditFacilityAxis
= wgp_WorkingCapitalFacilityMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wgp_AnadarkoMember
Fair value $ 1,150,000us-gaap_DebtInstrumentFairValue
/ us-gaap_CreditFacilityAxis
= wgp_WorkingCapitalFacilityMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wgp_AnadarkoMember		 [1] $ 0us-gaap_DebtInstrumentFairValue
/ us-gaap_CreditFacilityAxis
= wgp_WorkingCapitalFacilityMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wgp_AnadarkoMember		 [1]
[1] Fair value is measured using Level 2 inputs.