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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
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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 | $ 11,900,000 us-gaap_LitigationReserve | $ 17,500,000 us-gaap_LitigationReserve |  | $ 11,900,000 us-gaap_LitigationReserve |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,750,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = lea_U.S.SettlementAgreementsMember | 563,500 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = lea_CanadianSettlementAgreementMember
Payments for legal settlements |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 370,263 us-gaap_PaymentsForLegalSettlements / us-gaap_LitigationCaseAxis = lea_U.S.SettlementAgreementsMember |
Environmental reserves | 4,800,000 us-gaap_AccrualForEnvironmentalLossContingencies | 5,000,000 us-gaap_AccrualForEnvironmentalLossContingencies |  | 4,800,000 us-gaap_AccrualForEnvironmentalLossContingencies |  |  |  |  |  |  |  |  |  |  |  |
Number of production facilities destroyed by fire |  |  |  |  |  |  |  |  |  |  | 1 lea_NumberOfFacilities / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_FireMember |  |  |  |  |
Incurred losses and incremental costs related to the destruction of assets caused by a fire |  |  |  |  |  |  |  |  |  |  |  | 7,300,000 us-gaap_UnusualOrInfrequentItemLossGross / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_FireMember | 34,400,000 us-gaap_UnusualOrInfrequentItemLossGross / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_FireMember | 65,700,000 us-gaap_UnusualOrInfrequentItemLossGross / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_FireMember |  |
Insurance recoveries |  |  |  |  |  |  | 49,000,000 us-gaap_InsuranceRecoveries / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 59,100,000 us-gaap_InsuranceRecoveries / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 26,500,000 us-gaap_InsuranceRecoveries / us-gaap_IncomeStatementLocationAxis = lea_OtherIncomeAndExpenseMember | 29,900,000 us-gaap_InsuranceRecoveries / us-gaap_IncomeStatementLocationAxis = lea_OtherIncomeAndExpenseMember |  |  |  |  |  |
Insurance proceeds |  | 10,000,000 lea_ProceedsFromInsuranceSettlement | 66,400,000 lea_ProceedsFromInsuranceSettlement | 89,000,000 lea_ProceedsFromInsuranceSettlement |  |  |  |  |  |  |  |  |  |  |  |
Insurance proceeds, operating activities |  | 2,900,000 us-gaap_ProceedsFromInsuranceSettlementOperatingActivities | 47,200,000 us-gaap_ProceedsFromInsuranceSettlementOperatingActivities | 59,100,000 us-gaap_ProceedsFromInsuranceSettlementOperatingActivities |  |  |  |  |  |  |  |  |  |  |  |
Insurance proceeds, investing activities | 0 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities | 7,100,000 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities | 19,200,000 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities | 29,800,000 us-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 |  |  |  |  | 57,000 lea_NumberOfEmployeesEmployedUnderCollectiveBargainingAgreements / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember |  |  |  |  |  |  |  |  |  |  |
Rent expense | 128,100,000 us-gaap_OperatingLeasesRentExpenseNet | 117,200,000 us-gaap_OperatingLeasesRentExpenseNet | 108,800,000 us-gaap_OperatingLeasesRentExpenseNet |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement Amount, Cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,845 lea_LitigationSettlementAmountCash / us-gaap_LitigationCaseAxis = lea_CanadianSettlementAgreementMember

X
- Definition Litigation Settlement Amount, Cash + References No definition available. + Details
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Namespace Prefix: | lea_
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Balance Type: | credit
Period Type: | duration

X
- Definition The number of the Company's employees that are members of industrial trade unions and are employed under the terms of collective bargaining agreements that are scheduled to expire in 2012. + References No definition available. + Details
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Namespace Prefix: | lea_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of production facilities destroyed by fire. + References No definition available. + Details
Name: | lea_NumberOfFacilities
Namespace Prefix: | lea_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of the Company's employees that are members of industrial trade unions and are employed under the terms of collective bargaining agreements. + References No definition available. + Details
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Namespace Prefix: | lea_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains to insurance proceeds related to both operating and investing activities. + References No definition available. + Details
Name: | lea_ProceedsFromInsuranceSettlement
Namespace Prefix: | lea_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: 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=25496072&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References 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=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to operating activities. It excludes insurance settlements classified as investing cash flows, for example, insurance settlements related to fixed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 16 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3337-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of loss recognized in the income statement for an event or transaction, that is unusual in nature or occurs infrequently, but not both. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6365513&loc=d3e15138-107781 + Details
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