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Commitments and Contingencies - Additional Information (Detail)
 12 Months Ended 39 Months Ended 12 Months Ended 39 Months Ended 12 Months Ended 39 Months Ended 3 Months Ended 12 Months Ended 39 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2014
Unionized workforce subject to labor agreement expiring in 2014
Person
Dec. 31, 2014
Unionized workforce subject to labor agreement expiring in 2014
United States and Canada
Dec. 31, 2012
Cost of sales
USD ($)
Dec. 31, 2014
Cost of sales
USD ($)
Dec. 31, 2012
Other (income) expense
USD ($)
Dec. 31, 2014
Other (income) expense
USD ($)
Sep. 30, 2011
Fire
Facility
Dec. 31, 2013
Fire
USD ($)
Dec. 31, 2012
Fire
USD ($)
Dec. 31, 2014
Fire
USD ($)
Dec. 31, 2014
U.S. Settlement Agreements
USD ($)
Dec. 31, 2014
Canadian Settlement Agreement
CAD
Loss Contingencies [Line Items]                                
Reserves for pending legal disputes, including commercial disputes and other matters $ 11,900,000us-gaap_LitigationReserve $ 17,500,000us-gaap_LitigationReserve   $ 11,900,000us-gaap_LitigationReserve                        
Litigation settlement, amount                             8,750,000us-gaap_LitigationSettlementAmount
/ us-gaap_LitigationCaseAxis
= lea_U.S.SettlementAgreementsMember		 563,500us-gaap_LitigationSettlementAmount
/ us-gaap_LitigationCaseAxis
= lea_CanadianSettlementAgreementMember
Payments for legal settlements                             370,263us-gaap_PaymentsForLegalSettlements
/ us-gaap_LitigationCaseAxis
= lea_U.S.SettlementAgreementsMember		  
Environmental reserves 4,800,000us-gaap_AccrualForEnvironmentalLossContingencies 5,000,000us-gaap_AccrualForEnvironmentalLossContingencies   4,800,000us-gaap_AccrualForEnvironmentalLossContingencies                        
Number of production facilities destroyed by fire                     1lea_NumberOfFacilities
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= us-gaap_FireMember		          
Incurred losses and incremental costs related to the destruction of assets caused by a fire                       7,300,000us-gaap_UnusualOrInfrequentItemLossGross
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= us-gaap_FireMember		 34,400,000us-gaap_UnusualOrInfrequentItemLossGross
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= us-gaap_FireMember		 65,700,000us-gaap_UnusualOrInfrequentItemLossGross
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= us-gaap_FireMember		    
Insurance recoveries             49,000,000us-gaap_InsuranceRecoveries
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 59,100,000us-gaap_InsuranceRecoveries
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 26,500,000us-gaap_InsuranceRecoveries
/ us-gaap_IncomeStatementLocationAxis
= lea_OtherIncomeAndExpenseMember		 29,900,000us-gaap_InsuranceRecoveries
/ us-gaap_IncomeStatementLocationAxis
= lea_OtherIncomeAndExpenseMember		            
Insurance proceeds   10,000,000lea_ProceedsFromInsuranceSettlement 66,400,000lea_ProceedsFromInsuranceSettlement 89,000,000lea_ProceedsFromInsuranceSettlement                        
Insurance proceeds, operating activities   2,900,000us-gaap_ProceedsFromInsuranceSettlementOperatingActivities 47,200,000us-gaap_ProceedsFromInsuranceSettlementOperatingActivities 59,100,000us-gaap_ProceedsFromInsuranceSettlementOperatingActivities                        
Insurance proceeds, investing activities 0us-gaap_ProceedsFromInsuranceSettlementInvestingActivities 7,100,000us-gaap_ProceedsFromInsuranceSettlementInvestingActivities 19,200,000us-gaap_ProceedsFromInsuranceSettlementInvestingActivities 29,800,000us-gaap_ProceedsFromInsuranceSettlementInvestingActivities                        
Percentage employees that are members of collective bargaining agreements 45.00%lea_PercentageOfEmployeesEmployedUnderCollectiveBargainingAgreements     45.00%lea_PercentageOfEmployeesEmployedUnderCollectiveBargainingAgreements 79.00%lea_PercentageOfEmployeesEmployedUnderCollectiveBargainingAgreements
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember		 1.00%lea_PercentageOfEmployeesEmployedUnderCollectiveBargainingAgreements
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember
/ lea_RegionReportingInformationByRegionAxis
= lea_UnitedStatesAndCanadaMember		                    
Number of employees         57,000lea_NumberOfEmployeesEmployedUnderCollectiveBargainingAgreements
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember		                      
Rent expense 128,100,000us-gaap_OperatingLeasesRentExpenseNet 117,200,000us-gaap_OperatingLeasesRentExpenseNet 108,800,000us-gaap_OperatingLeasesRentExpenseNet                          
Litigation Settlement Amount, Cash                               23,845lea_LitigationSettlementAmountCash
/ us-gaap_LitigationCaseAxis
= lea_CanadianSettlementAgreementMember