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Debt and Interest Expense - Debt Activity Table (details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Beginning balance   $ 2,424,104us-gaap_DebtLongtermAndShorttermCombinedAmount
Ending balance 2,532,995us-gaap_DebtLongtermAndShorttermCombinedAmount 2,424,104us-gaap_DebtLongtermAndShorttermCombinedAmount
Anadarko [Member] | Working Capital Facility [Member]    
Debt Instrument [Line Items]    
Repayment (1,150)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_CreditFacilityAxis
= wgp_WorkingCapitalFacilityMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wgp_AnadarkoMember		  
Western Gas Partners [Member]    
Debt Instrument [Line Items]    
Other 41us-gaap_AmortizationOfDebtDiscountPremium
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		  
Western Gas Partners [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Borrowings 140,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		  
Repayment $ (30,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember