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Investments in Affiliates and Other Related Party Transactions - Beneficial Ownership in Affiliates Accounted for under Equity Method (Detail) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Shanghai Lear STEC Automotive Parts Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 55.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ShanghaiLearStecAutomotivePartsCoLimitedMember | 55.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ShanghaiLearStecAutomotivePartsCoLimitedMember | 55.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ShanghaiLearStecAutomotivePartsCoLimitedMember
Beijing BAI Lear Automotive Systems Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingBaiLearAutomotiveSystemsCoLimitedMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingBaiLearAutomotiveSystemsCoLimitedMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingBaiLearAutomotiveSystemsCoLimitedMember
Beijing Lear Automotive Electronics and Electrical Products Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingLearAutomotiveElectronicsAndElectricalProductsCoLtdMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingLearAutomotiveElectronicsAndElectricalProductsCoLtdMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingLearAutomotiveElectronicsAndElectricalProductsCoLtdMember
Dong Kwang Lear Yuhan Hoesa (Korea) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_DongKwangLearYuhanHoesaMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_DongKwangLearYuhanHoesaMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_DongKwangLearYuhanHoesaMember
Industrias Cousin Freres, S.L. (Spain) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_IndustriasCousinFreresSociedadLimitadaMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_IndustriasCousinFreresSociedadLimitadaMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_IndustriasCousinFreresSociedadLimitadaMember
Jiangxi Jiangling Lear Interior Systems Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_JiangxiJianglingLearInteriorSystemsCoLtdMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_JiangxiJianglingLearInteriorSystemsCoLtdMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_JiangxiJianglingLearInteriorSystemsCoLtdMember
Lear Dongfeng Automotive Seating Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_LearDongfengAutomotiveSeatingCoLtdMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_LearDongfengAutomotiveSeatingCoLtdMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_LearDongfengAutomotiveSeatingCoLtdMember
Changchun Lear FAWSN Automotive Electrical and Electronics Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ChangchunLearFawSihuanAutomotiveElectricalAndElectronicsCoLimitedMember | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ChangchunLearFawSihuanAutomotiveElectricalAndElectronicsCoLimitedMember | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ChangchunLearFawSihuanAutomotiveElectricalAndElectronicsCoLimitedMember
Changchun Lear FAWSN Automotive Seat Systems Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ChangchunLearFawSihuanAutomotiveSeatSystemsCoLtdMember | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ChangchunLearFawSihuanAutomotiveSeatSystemsCoLtdMember | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ChangchunLearFawSihuanAutomotiveSeatSystemsCoLtdMember
Honduras Electrical Distribution Systems S. de R.L. de C.V. (Honduras) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_HondurasElectricalDistributionSystemsSociedadDeResponsabilidadLimitadaDeCapitalVariableMember | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_HondurasElectricalDistributionSystemsSociedadDeResponsabilidadLimitadaDeCapitalVariableMember | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_HondurasElectricalDistributionSystemsSociedadDeResponsabilidadLimitadaDeCapitalVariableMember
Kyungshin-Lear Sales and Engineering LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_KyungshinLearSalesAndEngineeringLimitedLiabilityCompanyMember | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_KyungshinLearSalesAndEngineeringLimitedLiabilityCompanyMember | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_KyungshinLearSalesAndEngineeringLimitedLiabilityCompanyMember
Beijing Lear Dymos Automotive Systems Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingLearDymosAutomotiveSystemsCoLtdMember | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingLearDymosAutomotiveSystemsCoLtdMember | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingLearDymosAutomotiveSystemsCoLtdMember
Dymos Lear Automotive India Private Limited (India) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_DymosLearAutomotiveIndiaPrivateLimitedMember | 35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_DymosLearAutomotiveIndiaPrivateLimitedMember | 35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_DymosLearAutomotiveIndiaPrivateLimitedMember
eLumigen, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 30.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ElumigenLimitedLiabilityCompanyMember | 15.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ElumigenLimitedLiabilityCompanyMember | 0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ElumigenLimitedLiabilityCompanyMember
RevoLaze, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_RevolazeLimitedLiabilityCompanyMember | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_RevolazeLimitedLiabilityCompanyMember | 0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_RevolazeLimitedLiabilityCompanyMember
HB Polymer Company, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 10.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_HbPolymerLimitedLiabilityCompanyMember | 10.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_HbPolymerLimitedLiabilityCompanyMember | 0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_HbPolymerLimitedLiabilityCompanyMember
Tacle Seating USA, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_TacleSeatingUnitedStatesOfAmericaLimitedLiabilityCompanyMember | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_TacleSeatingUnitedStatesOfAmericaLimitedLiabilityCompanyMember | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_TacleSeatingUnitedStatesOfAmericaLimitedLiabilityCompanyMember
International Automotive Components Group North America, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_InternationalAutomotiveComponentsGroupNorthAmericaLimitedLiabilityCompanyMember | 0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_InternationalAutomotiveComponentsGroupNorthAmericaLimitedLiabilityCompanyMember | 23.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_InternationalAutomotiveComponentsGroupNorthAmericaLimitedLiabilityCompanyMember

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