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Basis of Presentation (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revision of Loss on Extinguishment of Debt    
Interest expense, net $ 78,236us-gaap_InterestIncomeExpenseNet $ 65,432us-gaap_InterestIncomeExpenseNet
Revision of loss on extinguishment of debt (58,626)us-gaap_GainsLossesOnExtinguishmentOfDebt 13,889us-gaap_GainsLossesOnExtinguishmentOfDebt
Effect of Correction of Debt Issuance Costs    
Revision of Loss on Extinguishment of Debt    
Interest expense, net   (65,432)us-gaap_InterestIncomeExpenseNet
/ us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis
= wlt_EffectofCorrectionofDebtIssuanceCostsMember
Interest income   75us-gaap_InvestmentIncomeInterest
/ us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis
= wlt_EffectofCorrectionofDebtIssuanceCostsMember
Revision of loss on extinguishment of debt   13,889us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis
= wlt_EffectofCorrectionofDebtIssuanceCostsMember
Prior to revision | Effect of Correction of Debt Issuance Costs    
Revision of Loss on Extinguishment of Debt    
Interest expense, net   (79,396)us-gaap_InterestIncomeExpenseNet
/ us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis
= wlt_EffectofCorrectionofDebtIssuanceCostsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
8.50% senior notes    
Revision of Loss on Extinguishment of Debt    
Revision of loss on extinguishment of debt $ (58,600)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= wlt_SeniorNotes8.50PercentageMember