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Income Taxes - Income Taxes - Additional information (Detail) (USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jan. 01, 2034 | Jan. 01, 2015
Income Taxes [Line Items] |  |  |  |  |  |
Domestic provision (benefit) | $ 71,300,000 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | $ 81,700,000 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | $ (724,900,000)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations |  |  |
Unrecognized net operating loss carryforwards, domestic |  |  | 104,800,000 lea_UnrecognizedTaxBenefitsOperatingLossCarryforwardsDomestic |  |  |
Unrecognized net operating loss carryforwards, foreign | 10,000,000 lea_UnrecognizedTaxBenefitsOperatingLossCarryforwardsForeign | 4,100,000 lea_UnrecognizedTaxBenefitsOperatingLossCarryforwardsForeign | 4,600,000 lea_UnrecognizedTaxBenefitsOperatingLossCarryforwardsForeign |  |  |
U.S. federal statutory income tax rate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |  |  |  |
Foreign jurisdictions income with tax holidays | 57,600,000 us-gaap_IncomeTaxReconciliationTaxHolidays | 73,700,000 us-gaap_IncomeTaxReconciliationTaxHolidays | 99,200,000 us-gaap_IncomeTaxReconciliationTaxHolidays |  |  |
Valuation allowance | 508,500,000 us-gaap_DeferredTaxAssetsValuationAllowance | 642,600,000 us-gaap_DeferredTaxAssetsValuationAllowance |  |  |  |
Net increase of valuation allowance | 134,100,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |  |  |  |
Undistributed earnings on which deferred tax liability is not provided | 1,200,000,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |  |  |
Tax loss carryforwards | 2,000,000,000 us-gaap_OperatingLossCarryforwards |  |  |  |  |
Tax loss carryforwards with no expiration date | 1,794,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration |  |  |  |  |
Tax loss carryforwards with expiration date | 252,900,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration |  |  |  |  |
Tax credit carryforwards | 419,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 437,200,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards |  |  |  |
Decrease in deferred tax asset related to domestic net operating loss carryforwards | 23,200,000 lea_DeferredTaxAssetAndTaxReturnDifference |  |  |  |  |
Unrecognized income tax benefits that, if recognized, would affect the effective tax rate | 39,700,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 31,900,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |  |
Unrecognized tax benefits | 39,700,000 us-gaap_UnrecognizedTaxBenefits | 45,200,000 us-gaap_UnrecognizedTaxBenefits | 34,400,000 us-gaap_UnrecognizedTaxBenefits | 49,400,000 us-gaap_UnrecognizedTaxBenefits |  |
Unrecognized tax benefits, interest and penalties | 6,100,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 6,700,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |  |  |
Interest and penalties, that if recognized would affect effective tax rate | 6,100,000 lea_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRateIncomeTaxPenaltiesAndInterestAccrued | 6,600,000 lea_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRateIncomeTaxPenaltiesAndInterestAccrued |  |  |  |
Decrease in unrecognized tax benefits, reasonably possible during the next twelve months | 600,000 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit |  |  |  |  |
Discrete tax benefit related to research and development credits |  | 3,400,000 us-gaap_IncomeTaxReconciliationTaxCreditsResearch |  |  |  |
Certain transfer pricing items |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Domestic provision (benefit) |  |  | (24,200,000)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = lea_TransferPricingMattersMember |  |  |
U.S. |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Valuation allowance | 35,200,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |  |  |  |
International jurisdictions |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Valuation allowance | 473,300,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |  |  |
State and local jurisdiction |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Year after which the Company or its subsidiaries subject to income tax examination | 2009 |  |  |  |  |
Mexico and Spain |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Year after which the Company or its subsidiaries subject to income tax examination | 2006 |  |  |  |  |
Canada and Italy |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Year after which the Company or its subsidiaries subject to income tax examination | 2009 |  |  |  |  |
Brazil, Hungary and Poland |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Year after which the Company or its subsidiaries subject to income tax examination | 2008 |  |  |  |  |
China and Germany |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Year after which the Company or its subsidiaries subject to income tax examination | 2010 |  |  |  |  |
United States |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Year after which the Company or its subsidiaries subject to income tax examination | 2013 |  |  |  |  |
Accrued liabilities |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Unrecognized tax benefits |  | 600,000 us-gaap_UnrecognizedTaxBenefits / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AccruedLiabilitiesMember |  |  |  |
Minimum |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Income tax holiday, termination date | 2015 |  |  |  |  |
Maximum |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Income tax holiday, termination date | 2027 |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Tax credit carryforwards |  |  |  |  | $ 0 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember | $ 442,200,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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