Quarterly report pursuant to Section 13 or 15(d)

Supplemental Guarantor Information - Condensed Consolidating Statement of Operations (Details)

v2.4.1.9
Supplemental Guarantor Information - Condensed Consolidating Statement of Operations (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Condensed Income Statements Captions [Line Items]    
Revenues $ 127,907us-gaap_Revenues $ 254,516us-gaap_Revenues
Operating costs and expenses:    
Lease operating expenses 53,331us-gaap_LeaseOperatingExpense 55,617us-gaap_LeaseOperatingExpense
Production taxes 637us-gaap_ProductionTaxExpense 1,992us-gaap_ProductionTaxExpense
Gathering and transportation 4,824us-gaap_GasGatheringTransportationMarketingAndProcessingCosts 5,296us-gaap_GasGatheringTransportationMarketingAndProcessingCosts
Depreciation, depletion, amortization and accretion 125,467us-gaap_DepreciationAmortizationAndAccretionNet 123,306us-gaap_DepreciationAmortizationAndAccretionNet
Ceiling test write-down of oil and natural gas properties 260,390us-gaap_ImpairmentOfOilAndGasProperties 0us-gaap_ImpairmentOfOilAndGasProperties
General and administrative expenses 20,766us-gaap_GeneralAndAdministrativeExpense 23,588us-gaap_GeneralAndAdministrativeExpense
Derivative loss 0us-gaap_GainLossOnDerivativeInstrumentsNetPretax 7,492us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Total costs and expenses 465,415us-gaap_CostsAndExpenses 217,291us-gaap_CostsAndExpenses
Operating income (loss) (337,508)us-gaap_OperatingIncomeLoss 37,225us-gaap_OperatingIncomeLoss
Interest expense:    
Incurred 22,944us-gaap_InterestCostsIncurred 21,460us-gaap_InterestCostsIncurred
Capitalized (1,783)us-gaap_InterestCostsCapitalizedAdjustment (2,072)us-gaap_InterestCostsCapitalizedAdjustment
Income (loss) before income tax expense (benefit) (358,669)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 17,837us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense (benefit) (103,574)us-gaap_IncomeTaxExpenseBenefit 6,648us-gaap_IncomeTaxExpenseBenefit
Net income (loss) (255,095)us-gaap_NetIncomeLoss 11,189us-gaap_NetIncomeLoss
Parent Company    
Condensed Income Statements Captions [Line Items]    
Revenues 82,463us-gaap_Revenues
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
143,986us-gaap_Revenues
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Operating costs and expenses:    
Lease operating expenses 37,386us-gaap_LeaseOperatingExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
39,110us-gaap_LeaseOperatingExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Production taxes 637us-gaap_ProductionTaxExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,992us-gaap_ProductionTaxExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Gathering and transportation 2,548us-gaap_GasGatheringTransportationMarketingAndProcessingCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,338us-gaap_GasGatheringTransportationMarketingAndProcessingCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Depreciation, depletion, amortization and accretion 75,152us-gaap_DepreciationAmortizationAndAccretionNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
62,431us-gaap_DepreciationAmortizationAndAccretionNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Ceiling test write-down of oil and natural gas properties 190,695us-gaap_ImpairmentOfOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
General and administrative expenses 12,388us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
11,445us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Derivative loss   7,492us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total costs and expenses 318,806us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
125,808us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Operating income (loss) (236,343)us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
18,178us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Earnings (loss) of affiliates (65,627)wti_IncomeLossFromAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
12,451wti_IncomeLossFromAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Interest expense:    
Incurred 22,230us-gaap_InterestCostsIncurred
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
20,679us-gaap_InterestCostsIncurred
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Capitalized (1,069)us-gaap_InterestCostsCapitalizedAdjustment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,291)us-gaap_InterestCostsCapitalizedAdjustment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income (loss) before income tax expense (benefit) (323,131)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
11,241us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income tax expense (benefit) (68,036)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
52us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net income (loss) (255,095)us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
11,189us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Guarantor Subsidiaries    
Condensed Income Statements Captions [Line Items]    
Revenues 45,444us-gaap_Revenues
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
110,530us-gaap_Revenues
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Operating costs and expenses:    
Lease operating expenses 15,945us-gaap_LeaseOperatingExpense
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
16,507us-gaap_LeaseOperatingExpense
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Gathering and transportation 2,276us-gaap_GasGatheringTransportationMarketingAndProcessingCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,958us-gaap_GasGatheringTransportationMarketingAndProcessingCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Depreciation, depletion, amortization and accretion 50,315us-gaap_DepreciationAmortizationAndAccretionNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
60,875us-gaap_DepreciationAmortizationAndAccretionNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Ceiling test write-down of oil and natural gas properties 69,695us-gaap_ImpairmentOfOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
General and administrative expenses 8,378us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
12,143us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Total costs and expenses 146,609us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
91,483us-gaap_CostsAndExpenses
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Operating income (loss) (101,165)us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
19,047us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Interest expense:    
Incurred 714us-gaap_InterestCostsIncurred
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
781us-gaap_InterestCostsIncurred
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Capitalized (714)us-gaap_InterestCostsCapitalizedAdjustment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(781)us-gaap_InterestCostsCapitalizedAdjustment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Income (loss) before income tax expense (benefit) (101,165)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
19,047us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Income tax expense (benefit) (35,538)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
6,596us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net income (loss) (65,627)us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
12,451us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Eliminations    
Operating costs and expenses:    
Earnings (loss) of affiliates 65,627wti_IncomeLossFromAffiliates
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(12,451)wti_IncomeLossFromAffiliates
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Interest expense:    
Income (loss) before income tax expense (benefit) 65,627us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(12,451)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Net income (loss) $ 65,627us-gaap_NetIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
$ (12,451)us-gaap_NetIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember