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Income Taxes (Narrative) (Details) In Thousands, unless otherwise specified | 12 Months Ended |  |  | 3 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 State [Member] USD ($) | Sep. 29, 2012 Foreign Tax Authority [Member] Belgium EUR (€) | Dec. 28, 2012 Foreign Tax Authority [Member] Belgium 2005 Assessment [Member] EUR (€) | Dec. 28, 2012 Foreign Tax Authority [Member] Belgium 2009 Assessment [Member] EUR (€) | Dec. 31, 2013 Foreign Tax Authority [Member] Belgium 2006 Assessment [Member] EUR (€) | Dec. 31, 2013 Foreign Tax Authority [Member] Belgium 2007 Assessment [Member] EUR (€) | Dec. 31, 2013 Foreign Tax Authority [Member] Belgium 2010 Assessment [Member] EUR (€) | Jan. 31, 2012 Foreign Tax Authority [Member] Belgium 2008 Assessment [Member] EUR (€) | Jun. 28, 2014 Foreign Tax Authority [Member] Belgium 2008 Assessment [Member] EUR (€) | Dec. 31, 2014 Foreign Subsidiary and State Net Operating Losses and Tax Credits [Member] USD ($) | Dec. 31, 2013 Foreign Subsidiary and State Net Operating Losses and Tax Credits [Member] USD ($) | Dec. 31, 2014 Disposal Of A Subsidiary [Member] USD ($) | Dec. 31, 2014 State Deferred Tax Assets [Member] USD ($) | Dec. 31, 2014 Operating Loss Carryforward, Foreign Jurisdiction [Member] USD ($)
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation allowance against deferred tax asset | $ 300,472 us-gaap_DeferredTaxAssetsValuationAllowance | $ 375,859 us-gaap_DeferredTaxAssetsValuationAllowance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in the valuation allowance | (39,243)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 54,274 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |  |  |  |  |  |  |  |  |  | (75,387)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = mhk_ForeignSubsidiaryAndStateNetOperatingLossesAndTaxCreditsMember | 12,471 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = mhk_ForeignSubsidiaryAndStateNetOperatingLossesAndTaxCreditsMember | (61,148)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = mhk_DisposalOfASubsidiaryMember | 51,987 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = mhk_StateDeferredTaxAssetsMember | 189,883 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = mhk_OperatingLossCarryforwardForeignJurisdictionMember
Net operating loss carryforwards and tax credit | 432,906 mhk_DeferredTaxAssetsOperatingLossesAndTaxCredits | 438,272 mhk_DeferredTaxAssetsOperatingLossesAndTaxCredits |  | 65,041 mhk_DeferredTaxAssetsOperatingLossesAndTaxCredits / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards in various foreign jurisdictions | 367,864 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal income taxes on earnings | 1,385,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Tax Assessment |  |  |  |  |  | 46,135 mhk_ForeignTaxAssessment / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE / mhk_TaxAssesmentYearAxis = mhk_TwoThousandAndFiveMember | 35,567 mhk_ForeignTaxAssessment / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE / mhk_TaxAssesmentYearAxis = mhk_TwoThousandAndNineMember | 38,817 mhk_ForeignTaxAssessment / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE / mhk_TaxAssesmentYearAxis = mhk_TwoThousandandSixMember | 39,635 mhk_ForeignTaxAssessment / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE / mhk_TaxAssesmentYearAxis = mhk_TwoThousandandSevenMember | 43,117 mhk_ForeignTaxAssessment / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE / mhk_TaxAssesmentYearAxis = mhk_TwoThousandandTenMember | 23,789 mhk_ForeignTaxAssessment / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE / mhk_TaxAssesmentYearAxis = mhk_TwoThousandAndEightMember | 30,131 mhk_ForeignTaxAssessment / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE / mhk_TaxAssesmentYearAxis = mhk_TwoThousandAndEightMember |  |  |  |  |
Interest Tax Examination, Refund, Interest Income |  |  |  |  | 1,583 mhk_InterestTaxExaminationRefundInterestIncome / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE |  |  |  |  |  |  |  |  |  |  |  |
Gross unrecognized tax benefits | 49,599 us-gaap_UnrecognizedTaxBenefits | 56,545 us-gaap_UnrecognizedTaxBenefits | 53,835 us-gaap_UnrecognizedTaxBenefits |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate | 22,490 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and penalties | 9,409 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | 13,890 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued/(reversed) interest and penalties | (3,579)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 74 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | (1,585)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected decrease in unrecognized tax benefits within next twelve months | $ 14,746 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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