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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		$ 171.5us-gaap_EquityMethodInvestments	$ 172.0us-gaap_EquityMethodInvestments
Due from affiliates		75.5us-gaap_DueFromAffiliates	74.2us-gaap_DueFromAffiliates
Due to affiliates		5.7us-gaap_DueToAffiliateCurrentAndNoncurrent	8.8us-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	$ 49.6us-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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