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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current assets    
Cash and cash equivalents $ 67,213,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 113,085,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 97,890,000us-gaap_AccountsReceivableNetCurrent [1] 83,943,000us-gaap_AccountsReceivableNetCurrent [1]
Other current assets 10,841,000us-gaap_OtherAssetsCurrent [2] 10,799,000us-gaap_OtherAssetsCurrent [2]
Total current assets 175,944,000us-gaap_AssetsCurrent 207,827,000us-gaap_AssetsCurrent
Note receivable - Anadarko 260,000,000us-gaap_NotesReceivableRelatedPartiesNoncurrent 260,000,000us-gaap_NotesReceivableRelatedPartiesNoncurrent
Property, plant and equipment    
Cost 5,424,699,000us-gaap_PropertyPlantAndEquipmentGross 4,239,100,000us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation 1,040,328,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 855,845,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property, plant and equipment 4,384,371,000us-gaap_PropertyPlantAndEquipmentNet 3,383,255,000us-gaap_PropertyPlantAndEquipmentNet
Goodwill 384,387,000us-gaap_Goodwill 105,336,000us-gaap_Goodwill
Other intangible assets 884,857,000us-gaap_IntangibleAssetsNetExcludingGoodwill 53,606,000us-gaap_IntangibleAssetsNetExcludingGoodwill
Equity investments 634,492,000us-gaap_EquityMethodInvestments 593,400,000us-gaap_EquityMethodInvestments
Other assets 28,289,000us-gaap_OtherAssetsNoncurrent 27,401,000us-gaap_OtherAssetsNoncurrent
Total assets 6,752,340,000us-gaap_Assets 4,630,825,000us-gaap_Assets
Current liabilities    
Accounts and natural gas imbalance payables 29,104,000us-gaap_AccountsPayableTradeCurrent [3] 39,589,000us-gaap_AccountsPayableTradeCurrent [3]
Accrued ad valorem taxes 14,812,000us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 13,860,000us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Accrued liabilities 158,730,000us-gaap_AccruedLiabilitiesCurrent [4] 138,034,000us-gaap_AccruedLiabilitiesCurrent [4]
Total current liabilities 203,796,000us-gaap_LiabilitiesCurrent 191,483,000us-gaap_LiabilitiesCurrent
Long-term debt 2,422,954,000us-gaap_LongTermDebtNoncurrent 1,418,169,000us-gaap_LongTermDebtNoncurrent
Deferred income taxes 4,171,000us-gaap_DeferredTaxLiabilitiesNoncurrent 37,998,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Asset retirement obligations and other 110,069,000us-gaap_AssetRetirementObligationsNoncurrent 79,145,000us-gaap_AssetRetirementObligationsNoncurrent
Total long-term liabilities 2,537,194,000us-gaap_LiabilitiesNoncurrent 1,535,312,000us-gaap_LiabilitiesNoncurrent
Total liabilities 2,740,990,000us-gaap_Liabilities 1,726,795,000us-gaap_Liabilities
Equity and partners' capital    
Common units (218,909,977 and 218,895,515 units issued and outstanding at December 31, 2014, and 2013, respectively) 1,260,195,000us-gaap_LimitedPartnersCapitalAccount 905,082,000us-gaap_LimitedPartnersCapitalAccount
Net investment by Anadarko 0us-gaap_OtherPartnersCapital 312,092,000us-gaap_OtherPartnersCapital
Total partners' capital 1,260,195,000us-gaap_PartnersCapital 1,217,174,000us-gaap_PartnersCapital
Noncontrolling interests 2,751,155,000us-gaap_PartnersCapitalAttributableToNoncontrollingInterest 1,686,856,000us-gaap_PartnersCapitalAttributableToNoncontrollingInterest
Total equity and partners' capital 4,011,350,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest 2,904,030,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
Total liabilities, equity and partners' capital 6,752,340,000us-gaap_LiabilitiesAndStockholdersEquity 4,630,825,000us-gaap_LiabilitiesAndStockholdersEquity
Anadarko [Member]    
Current liabilities    
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
[1] Accounts receivable, net includes amounts receivable from affiliates (as defined in Note 1) of $64.5 million and $47.8 million as of December 31, 2014 and 2013, respectively.
[2] Other current assets includes natural gas imbalance receivables from affiliates of $0.2 million and $0.1 million as of December 31, 2014 and 2013, respectively.
[3] Accounts and natural gas imbalance payables includes amounts payable to affiliates of $0.1 million and $2.3 million as of December 31, 2014 and 2013, respectively.
[4] Accrued liabilities includes amounts payable to affiliates of zero and $0.1 million as of December 31, 2014 and 2013, respectively.