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v2.4.1.9

Investments in Affiliates and Other Related Party Transactions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Apr. 30, 2014 | Dec. 31, 2012
Related Party Transaction [Line Items] |  |  |  |  |
Investment in affiliates |  | $ 171.5 us-gaap_EquityMethodInvestments | $ 172.0 us-gaap_EquityMethodInvestments |  |
Due from affiliates |  | 75.5 us-gaap_DueFromAffiliates | 74.2 us-gaap_DueFromAffiliates |  |
Due to affiliates |  | 5.7 us-gaap_DueToAffiliateCurrentAndNoncurrent | 8.8 us-gaap_DueToAffiliateCurrentAndNoncurrent |  |
Tacle Seating USA, LLC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Equity method investment ownership interest |  |  |  | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_TacleSeatingUSALLCMember |
eLumigen, LLC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Equity method investment ownership interest |  | 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
International Automotive Components Group North America, LLC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Percentage of ownership interest sold | 22.88%lea_PercentageOfOwnershipInterestSold / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_InternationalAutomotiveComponentsGroupNorthAmericaLimitedLiabilityCompanyMember |  |  |  |
Proceeds from sale of equity investments | $ 49.6 us-gaap_ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_InternationalAutomotiveComponentsGroupNorthAmericaLimitedLiabilityCompanyMember |  |  |  |
Equity method investment ownership interest |  | 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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