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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) $ 71,300,000us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ 81,700,000us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ (724,900,000)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations      
Unrecognized net operating loss carryforwards, domestic     104,800,000lea_UnrecognizedTaxBenefitsOperatingLossCarryforwardsDomestic      
Unrecognized net operating loss carryforwards, foreign 10,000,000lea_UnrecognizedTaxBenefitsOperatingLossCarryforwardsForeign 4,100,000lea_UnrecognizedTaxBenefitsOperatingLossCarryforwardsForeign 4,600,000lea_UnrecognizedTaxBenefitsOperatingLossCarryforwardsForeign      
U.S. federal statutory income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate          
Foreign jurisdictions income with tax holidays 57,600,000us-gaap_IncomeTaxReconciliationTaxHolidays 73,700,000us-gaap_IncomeTaxReconciliationTaxHolidays 99,200,000us-gaap_IncomeTaxReconciliationTaxHolidays      
Valuation allowance 508,500,000us-gaap_DeferredTaxAssetsValuationAllowance 642,600,000us-gaap_DeferredTaxAssetsValuationAllowance        
Net increase of valuation allowance 134,100,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount          
Undistributed earnings on which deferred tax liability is not provided 1,200,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries          
Tax loss carryforwards 2,000,000,000us-gaap_OperatingLossCarryforwards          
Tax loss carryforwards with no expiration date 1,794,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration          
Tax loss carryforwards with expiration date 252,900,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration          
Tax credit carryforwards 419,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 437,200,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards        
Decrease in deferred tax asset related to domestic net operating loss carryforwards 23,200,000lea_DeferredTaxAssetAndTaxReturnDifference          
Unrecognized income tax benefits that, if recognized, would affect the effective tax rate 39,700,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 31,900,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate        
Unrecognized tax benefits 39,700,000us-gaap_UnrecognizedTaxBenefits 45,200,000us-gaap_UnrecognizedTaxBenefits 34,400,000us-gaap_UnrecognizedTaxBenefits 49,400,000us-gaap_UnrecognizedTaxBenefits    
Unrecognized tax benefits, interest and penalties 6,100,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 6,700,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued        
Interest and penalties, that if recognized would affect effective tax rate 6,100,000lea_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRateIncomeTaxPenaltiesAndInterestAccrued 6,600,000lea_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRateIncomeTaxPenaltiesAndInterestAccrued        
Decrease in unrecognized tax benefits, reasonably possible during the next twelve months 600,000us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit          
Discrete tax benefit related to research and development credits   3,400,000us-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 35,200,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		          
International jurisdictions            
Income Taxes [Line Items]            
Valuation allowance 473,300,000us-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   600,000us-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         $ 0us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		 $ 442,200,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember