1.0.0.3 false CONSOLIDATED BALANCE SHEETS (USD $) In Thousands false 1 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 2 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 4 Current assets of continuing operations: 2 wlt_CurrentAssetsOfContinuingOperationsAbstract wlt false na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 5 Cash and cash equivalents 3 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 true true 165279000 165279 false false 2 true true 116074000 116074 false false No definition available. No authoritative reference available. false 6 Receivables, net 3 us-gaap_ReceivablesNetCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 70500000 70500 false false 2 false true 140423000 140423 false false No definition available. No authoritative reference available. false 7 Inventories 3 us-gaap_InventoryNet us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 99278000 99278 false false 2 false true 75172000 75172 false false No definition available. No authoritative reference available. false 8 Deferred income taxes 3 us-gaap_DeferredTaxAssetsNetCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 110576000 110576 false false 2 false true 84669000 84669 false false No definition available. No authoritative reference available. false 9 Other current assets 3 us-gaap_OtherAssetsCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 27065000 27065 false false 2 false true 26119000 26119 false false No definition available. No authoritative reference available. false 10 Total current assets 3 us-gaap_AssetsCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 472698000 472698 false false 2 false true 442457000 442457 false false No definition available. No authoritative reference available. true 11 Property, plant and equipment, net 3 us-gaap_PropertyPlantAndEquipmentNet us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 522931000 522931 false false 2 false true 504585000 504585 false false No definition available. No authoritative reference available. false 12 Deferred income taxes 3 us-gaap_DeferredTaxAssetsNetNoncurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 178338000 178338 false false 2 false true 179402000 179402 false false No definition available. No authoritative reference available. false 13 Other long-term assets 3 us-gaap_OtherAssetsNoncurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 70192000 70192 false false 2 false true 69251000 69251 false false No definition available. No authoritative reference available. false 14 Total assets of continuing operations 3 wlt_AssetsOfContinuingOperations wlt false debit instant monetary Sum of the carrying amounts as of the balance sheet date of all assets that are recognized and attributable to continuing... false false false false false false false false false 1 false true 1244159000 1244159 false false 2 false true 1195695000 1195695 false false Sum of the carrying amounts as of the balance sheet date of all assets that are recognized and attributable to continuing operations. No authoritative reference available. true 15 Assets of discontinued operations: 2 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 16 Current assets 3 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 15197000 15197 false false 2 false true 16158000 16158 false false No definition available. No authoritative reference available. false 17 Long-term assets 3 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationNoncurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false false 0 0 false false 2 false true 18396000 18396 false false No definition available. No authoritative reference available. false 18 Unclassified assets 3 wlt_UnclassifiedAssetsOfDisposalGroupIncludingDiscontinuedOperation wlt false debit instant monetary The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for unclassified assets... false false false false false false false false false 1 false false 0 0 false false 2 false true 1837744000 1837744 false false The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for unclassified assets of a disposal group, including a component of the entity (discontinued operation), to be sold or that has subsequently been disposed of through sale, spin-offs or closures, as of the financial statement date. No authoritative reference available. false 19 Total assets of discontinued operations 3 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 15197000 15197 false false 2 false true 1872298000 1872298 false false No definition available. No authoritative reference available. true 20 Total assets 2 us-gaap_Assets us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 1259356000 1259356 false false 2 false true 3067993000 3067993 false false No definition available. No authoritative reference available. true 22 Liabilities of continuing operations: 2 wlt_LiabilitiesOfContinuingOperationsAbstract wlt false na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 23 Accounts payable 3 us-gaap_AccountsPayableCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 44211000 44211 false false 2 false true 60497000 60497 false false No definition available. No authoritative reference available. false 24 Accrued expenses 3 us-gaap_AccruedLiabilitiesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 39034000 39034 false false 2 false true 57230000 57230 false false No definition available. No authoritative reference available. false 25 Current debt 3 us-gaap_DebtCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 13351000 13351 false false 2 false true 13480000 13480 false false No definition available. No authoritative reference available. false 26 Accumulated postretirement benefits obligation 3 wlt_OtherPostretirementDefinedBenefitPlanLiabilitiesCurrent wlt false credit instant monetary This represents the current portion of the liability recognized in the balance sheet that is associated with other... false false false false false false false false false 1 false true 23563000 23563 false false 2 false true 19124000 19124 false false This represents the current portion of the liability recognized in the balance sheet that is associated with other postretirement defined benefit plans (excluding pension plans). No authoritative reference available. false 27 Other current liabilities 3 us-gaap_OtherLiabilitiesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 18513000 18513 false false 2 false true 20801000 20801 false false No definition available. No authoritative reference available. false 28 Total current liabilities 3 us-gaap_LiabilitiesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 138672000 138672 false false 2 false true 171132000 171132 false false No definition available. No authoritative reference available. true 29 Long-term debt 3 us-gaap_LongTermDebtAndCapitalLeaseObligations us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 163147000 163147 false false 2 false true 211905000 211905 false false No definition available. No authoritative reference available. false 30 Accumulated postretirement benefits obligation 3 us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 429096000 429096 false false 2 false true 349184000 349184 false false No definition available. No authoritative reference available. false 31 Other long-term liabilities 3 us-gaap_OtherLiabilitiesNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 261736000 261736 false false 2 false true 273645000 273645 false false No definition available. No authoritative reference available. false 32 Total liabilities of continuing operations 3 wlt_LiabilitiesOfContinuingOperations wlt false credit instant monetary Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized and attributable to... false false false false false false false false false 1 false true 992651000 992651 false false 2 false true 1005866000 1005866 false false Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized and attributable to continuing operations. No authoritative reference available. true 33 Liabilities of discontinued operations: 2 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 34 Current liabilities 3 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 7310000 7310 false false 2 false true 12400000 12400 false false No definition available. No authoritative reference available. false 35 Unclassified liabilities 3 wlt_UnclassifiedLiabilitiesOfDisposalGroupIncludingDiscontinuedOperation wlt false credit instant monetary Carrying value of unclassified obligations relating to the sale, spin-off, closure, disposal or planned sale in the near... false false false false false false false false false 1 false false 0 0 false false 2 false true 1419458000 1419458 false false Carrying value of unclassified obligations relating to the sale, spin-off, closure, disposal or planned sale in the near future (generally within one year) of a disposal group, including a component of the entity (discontinued operation), as of the balance sheet date. No authoritative reference available. false 36 Total liabilities of discontinued operations 3 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 7310000 7310 false false 2 false true 1431858000 1431858 false false No definition available. No authoritative reference available. true 37 Total liabilities 2 us-gaap_Liabilities us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 999961000 999961 false false 2 false true 2437724000 2437724 false false No definition available. No authoritative reference available. true 39 Stockholders' equity: 2 us-gaap_StockholdersEquityAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 40 Common stock, $0.01 par value per share: Authorized - 200,000,000 shares; Issued - 53,256,904 and 54,143,958 shares, respectively 3 us-gaap_CommonStockValue us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 533000 533 false false 2 false true 541000 541 false false No definition available. No authoritative reference available. false 41 Preferred stock, $0.01 par value per share: Authorized - 20,000,000 shares, issued - 0 shares 3 us-gaap_PreferredStockValue us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 0 0 false false No definition available. No authoritative reference available. false 42 Capital in excess of par value 3 us-gaap_AdditionalPaidInCapitalCommonStock us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 374522000 374522 false false 2 false true 714174000 714174 false false No definition available. No authoritative reference available. false 43 Retained earnings 3 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 50852000 50852 false false 2 false true 50990000 50990 false false No definition available. No authoritative reference available. false 44 Accumulated other comprehensive income (loss): 3 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 45 Pension and other post-retirement benefit plans, net of tax 4 us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true -167037000 -167037 false false 2 false true -137364000 -137364 false false No definition available. No authoritative reference available. false 46 Unrealized gain on hedges, net of tax 4 us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 525000 525 false false 2 false true 1928000 1928 false false No definition available. No authoritative reference available. false 47 Total stockholders' equity 3 us-gaap_StockholdersEquity us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 259395000 259395 false false 2 false true 630269000 630269 false false No definition available. No authoritative reference available. true 48 Total liabilities and stockholders' equity 2 us-gaap_LiabilitiesAndStockholdersEquity us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 true true 1259356000 1259356 false false 2 true true 3067993000 3067993 false false No definition available. No authoritative reference available. true false 2 43 false Thousands UnKnown UnKnown false true