2.4.0.84080 - Disclosure - Commitments and Contingencies (Details)truefalsefalse1false falsefalseD2010Q2_M06http://www.sec.gov/CIK0000837173duration2010-06-01T00:00:002010-06-30T00:00:002false falsefalseD2012Q2YTDhttp://www.sec.gov/CIK0000837173duration2012-01-01T00:00:002012-06-30T00:00:003false USDfalsefalse$I2013Q2http://www.sec.gov/CIK0000837173instant2013-06-30T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4false truefalseD2013Q2YTD_WalterCokeIncMember_EnvironmentalIssueMemberhttp://www.sec.gov/CIK0000837173duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseEnvironmental Mattersus-gaap_LossContingenciesByNatureOfContingencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EnvironmentalIssueMemberus-gaap_LossContingenciesByNatureOfContingencyAxisexplicitMemberfalsefalseWalter Coke, Inc.dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiwlt_WalterCokeIncMemberdei_LegalEntityAxisexplicitMemberItemStandardhttp://www.walterenergy.com/20130630itemwlt05false CADtruefalseD2013Q1_M0305_EnvironmentalIssueMemberhttp://www.sec.gov/CIK0000837173duration2013-03-04T00:00:002013-03-05T00:00:00falsefalseEnvironmental Mattersus-gaap_LossContingenciesByNatureOfContingencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EnvironmentalIssueMemberus-gaap_LossContingenciesByNatureOfContingencyAxisexplicitMemberfalsefalseJim Walter Resources, Incdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiwlt_JimWalterResourcesIncMemberdei_LegalEntityAxisexplicitMemberCADStandardhttp://www.xbrl.org/2003/iso4217CADiso42170CADCAD6false truefalseD2012Q2_M05_SecuritiesClassActionAndShareholderDerivativeActionsMemberhttp://www.sec.gov/CIK0000837173duration2012-05-01T00:00:002012-05-30T00:00:00falsefalseSecurities Class Actions and Shareholder Derivative Actionsus-gaap_LossContingenciesByNatureOfContingencyAxisxbrldihttp://xbrl.org/2006/xbrldiwlt_SecuritiesClassActionAndShareholderDerivativeActionsMemberus-gaap_LossContingenciesByNatureOfContingencyAxisexplicitMemberItemStandardhttp://www.walterenergy.com/20130630itemwlt07false truefalseD2012Q1_M01_SecuritiesClassActionAndShareholderDerivativeActionsMemberhttp://www.sec.gov/CIK0000837173duration2012-01-01T00:00:002012-01-31T00:00:00falsefalseSecurities Class Actions and Shareholder Derivative Actionsus-gaap_LossContingenciesByNatureOfContingencyAxisxbrldihttp://xbrl.org/2006/xbrldiwlt_SecuritiesClassActionAndShareholderDerivativeActionsMemberus-gaap_LossContingenciesByNatureOfContingencyAxisexplicitMemberItemStandardhttp://www.walterenergy.com/20130630itemwlt08false truefalseD2013Q2YTD_SecuritiesClassActionAndShareholderDerivativeActionsMemberhttp://www.sec.gov/CIK0000837173duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseSecurities Class Actions and Shareholder Derivative Actionsus-gaap_LossContingenciesByNatureOfContingencyAxisxbrldihttp://xbrl.org/2006/xbrldiwlt_SecuritiesClassActionAndShareholderDerivativeActionsMemberus-gaap_LossContingenciesByNatureOfContingencyAxisexplicitMemberItemStandardhttp://www.walterenergy.com/20130630itemwlt01true 3us-gaap_LossContingenciesLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Commitments and contingencies2false 4wlt_PeriodOfExtensionFromInitialSubmissionToSubmitFinalOrderwlt_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse0090 daysfalsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:durationItemTypenaRepresents the extension period from the initial submission date to submit the proposed final order addressing all issues that have been litigated for the designated tax years.No definition available.false0Extension period to submit proposed final order3false 4wlt_TimeLimitToFileFormalProtestToTaxChangeLetterswlt_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse0030 daysfalsefalsefalse2falsefalsefalse0030 daysfalsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:durationItemTypenaThe period of time within which a formal protest with the Internal Revenue Service on letters of proposed changes to tax, which have not been previously settled or conceded, must be filed.No definition available.false0Comment letter period4false 4wlt_DiscontinuedOperationAccruedUnrecognizedTaxBenefitswlt_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse3800000038000000USD$falsetruefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the amount of accrued unrecognized tax benefit resulting from the sale of a business component at the end of period.No definition available.false2Accruals for unrecognized tax benefits related to disposition5false 4wlt_NumberOfPropertiesEntityAgreedToRemediatewlt_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse2323falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of properties that the entity has agreed to remediate.No definition available.false256Number of properties that the entity has agreed to remediate6false 4us-gaap_LossContingencyDamagesSoughtValueus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse100000100000CADfalsetruefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe value (monetary amount) of the award the plaintiff seeks in the legal matter.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Penalty sought7false 4wlt_LossContingencyNumberOfDefendantExecutiveDirectorswlt_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7truefalsefalse33falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of executive directors named as defendants in a lawsuit.No definition available.false256Number of executive directors as defendants8false 4wlt_NumberOfActionswlt_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse22falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of actions consolidated in entity's securities litigation.No definition available.false256Number of actions9false 4wlt_NumberOfComplaintswlt_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8truefalsefalse33falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of complaints with executive directors named as defendants in a lawsuit.No definition available.false256Number of complaintsfalseCommitments and Contingencies (Details)NoRoundingUnKnownUnKnownUnKnowntruefalsetrueSheethttp://www.walterenergy.com/role/DisclosureCommitmentsAndContingenciesDetails89