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Segment Reporting - Summary of Percentage of Revenues from Major Customers (Detail) (Sales) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
General Motors |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of revenues from major customers | 22.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_MajorCustomersAxis = lea_GeneralMotorsMember | 21.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_MajorCustomersAxis = lea_GeneralMotorsMember | 21.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_MajorCustomersAxis = lea_GeneralMotorsMember
Ford |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of revenues from major customers | 20.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_MajorCustomersAxis = lea_FordMotorCompanyMember | 21.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_MajorCustomersAxis = lea_FordMotorCompanyMember | 19.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_MajorCustomersAxis = lea_FordMotorCompanyMember
BMW |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of revenues from major customers | 11.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_MajorCustomersAxis = lea_BmwMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_MajorCustomersAxis = lea_BmwMember | 10.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_MajorCustomersAxis = lea_BmwMember

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