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Debt - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | 3 Months Ended | 1 Months Ended |
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Mar. 29, 2014 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 30, 2014 | Aug. 24, 2012 | Mar. 29, 2014 | Jan. 30, 2013 | Jan. 31, 2015 | Oct. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repurchase of senior notes | $ (327,100,000)us-gaap_RepaymentsOfUnsecuredDebt |  | $ (327,100,000)us-gaap_RepaymentsOfUnsecuredDebt | $ (72,100,000)us-gaap_RepaymentsOfUnsecuredDebt | $ (72,100,000)us-gaap_RepaymentsOfUnsecuredDebt |  |  |  |  |  |
Loss on extinguishment of debt |  | 17,500,000 us-gaap_GainsLossesOnExtinguishmentOfDebt | 17,900,000 us-gaap_GainsLossesOnExtinguishmentOfDebt | 3,600,000 us-gaap_GainsLossesOnExtinguishmentOfDebt | 3,700,000 us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |
Payment for redemption of aggregate principal amount |  |  |  |  | 70,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount |  |  |  |  |  |
Compliance with covenants under Notes |  |  | As of December 31, 2014, the Company was in compliance with all covenants under the indentures governing the Notes. |  |  |  |  |  |  |  |
Percentage owned, domestic subsidiaries |  |  | 1 lea_PercentageOwnedDomesticSubsidiaries |  |  |  |  |  |  |  |
Line of credit facility, covenants and restrictions |  |  | The Credit Agreement contains various customary representations, warranties and covenants by the Company, including, without limitation, (i) covenants regarding maximum leverage and minimum interest coverage, (ii) limitations on fundamental changes involving the Company or its subsidiaries and (iii) limitations on indebtedness, liens, investments and restricted payments. |  |  |  |  |  |  |  |
5.25% Senior Notes due 2025 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | 650,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember |  |  |  |  |
Debt issuance cost |  |  |  |  |  | 8,400,000 us-gaap_DebtIssuanceCosts / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember |  |  |  |  |
Term Loan Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount |  |  |  |  |  | 500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lea_TermLoanFacilityMember |  |  |  |  |
Line of credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Borrowings under revolving credit facility |  |  | 22,000,000 us-gaap_ProceedsFromLinesOfCredit / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |
Repayments under revolving credit facility |  |  | 22,000,000 us-gaap_RepaymentsOfLinesOfCredit / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember | 518,700,000 us-gaap_RepaymentsOfLinesOfCredit / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |
Line of credit facility, compliance with covenants |  |  | As of December 31, 2014, the Company was in compliance with all covenants under the credit agreement. |  |  |  |  |  |  |  |
Line of credit | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, facility fee |  |  | 0.25%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |
Line of credit | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, facility fee |  |  | 0.50%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |
Line of credit | Domestic subsidiaries |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of stock secured on a first priority basis |  | 100.00%lea_PercentageOfStock / dei_LegalEntityAxis = lea_DomesticSubsidiariesMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember | 100.00%lea_PercentageOfStock / dei_LegalEntityAxis = lea_DomesticSubsidiariesMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |
Line of credit | Foreign subsidiaries |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of stock secured on a first priority basis |  | 65.00%lea_PercentageOfStock / dei_LegalEntityAxis = lea_ForeignSubsidiariesMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember | 65.00%lea_PercentageOfStock / dei_LegalEntityAxis = lea_ForeignSubsidiariesMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |
Line of credit | Eurodollar |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum interest rate margin |  |  | 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_DebtInstrumentAxis = us-gaap_EurodollarMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |
Maximum interest rate margin |  |  | 2.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = us-gaap_EurodollarMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |
Line of credit facility, interest rate at period end |  | 1.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = us-gaap_EurodollarMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember | 1.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = us-gaap_EurodollarMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |
Line of credit | Base Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum interest rate margin |  |  | 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_DebtInstrumentAxis = us-gaap_BaseRateMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |
Maximum interest rate margin |  |  | 1.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = us-gaap_BaseRateMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |
Line of credit facility, interest rate at period end |  | 0.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = us-gaap_BaseRateMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember | 0.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = us-gaap_BaseRateMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |
Other short-term borrowings |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  | 5,300,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = lea_OtherShortTermBorrowingsMember | 5,300,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = lea_OtherShortTermBorrowingsMember | 5,400,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = lea_OtherShortTermBorrowingsMember |  |  |  |  |  |  |
7.875% Senior Notes due 2018 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated coupon rate |  | 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandEighteenMember | 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandEighteenMember | 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandEighteenMember |  |  |  |  |  |  |
Long-term debt, yield to maturity |  |  |  | 8.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandEighteenMember |  |  |  |  |  |  |
Percentage of debt redemption |  |  |  |  | 10.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandEighteenMember |  |  |  |  |  |
Redemption price equal to percentage of principal amount redeemed |  |  |  |  | 103.00%lea_DebtRedemptionFixedPricePercentOfPar / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandEighteenMember |  |  |  |  |  |
Payment for redemption of aggregate principal amount | 280,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandEighteenMember |  |  |  |  |  |  | 280,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandEighteenMember | 70,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandEighteenMember |  |
8.125% Senior Notes due 2020 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount |  | 245,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember | 245,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember |  |  |  |  |  |  |  |
Stated coupon rate |  | 8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember | 8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember | 8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember |  |  |  |  |  |  |
Long-term debt, price |  | 99.164%lea_DebtInstrumentPrice / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember | 99.164%lea_DebtInstrumentPrice / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember |  |  |  |  |  |  |  |
Long-term debt, yield to maturity |  | 8.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember | 8.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember | 8.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember |  |  |  |  |  |  |
Percentage of debt redemption |  |  |  |  |  |  | 10.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember | 10.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember |  |  |
Percentage of debt redemption price |  |  |  |  |  |  | 1.03%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember |  |  |  |
Payment for redemption of aggregate principal amount | 35,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember |  |  |  |  |  |  | 35,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember |  |  |
Debt instrument, payment terms |  |  | Interest is payable on March 15 and September 15 of each year |  |  |  |  |  |  |  |
Description of notes restrictive covenants |  |  | The indenture governing the 2020 Notes contains restrictive covenants that, among other things, limit the ability of the Company and its subsidiaries to: (i) incur additional debt, (ii) pay dividends and make other restricted payments, (iii) create or permit certain liens, (iv) issue or sell capital stock of the Company’s restricted subsidiaries, (v) use the proceeds from sales of assets and subsidiary stock, (vi) create or permit restrictions on the ability of the Company’s restricted subsidiaries to pay dividends or make other distributions to the Company, (vii) enter into transactions with affiliates, (viii) enter into sale and leaseback transactions and (ix) consolidate or merge or sell all or substantially all of the Company’s assets. The foregoing limitations are subject to exceptions as set forth in the 2020 Notes. In addition, if in the future the 2020 Notes have an investment grade credit rating from both Moody’s Investors Service and Standard & Poor’s Ratings Services and no default has occurred and is continuing, certain of these covenants will, thereafter, no longer apply to the 2020 Notes for so long as the 2020 Notes have an investment grade credit rating by both rating agencies. The indenture governing the 2020 Notes also provides for customary events of default. |  |  |  |  |  |  |  |
4.75% Senior Notes due 2023 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount |  | 500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember | 500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember |  |  |  |  |  |  |  |
Stated coupon rate |  | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember |  |  |  |  |  |  |
Long-term debt, yield to maturity |  | 4.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember | 4.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember | 4.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  | 500,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember |  |
Debt issuance cost |  |  |  |  |  |  |  |  | 7,400,000 us-gaap_DebtIssuanceCosts / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember |  |
Debt instrument, payment terms |  |  | Interest is payable on January 15 and July 15 of each year |  |  |  |  |  |  |  |
Description of notes restrictive covenants |  |  | Subject to certain exceptions, the indentures governing the 2023 Notes, 2024 Notes and 2025 Notes contain restrictive covenants that, among other things, limit the ability of the Company to: (i) create or permit certain liens and (ii) consolidate or merge or sell all or substantially all of the Company’s assets. In addition, the indentures governing the 2023 Notes and 2024 Notes limit the ability of the Company to enter into sale and leaseback transactions. The indentures governing the Notes also provide for customary events of default. |  |  |  |  |  |  |  |
4.75% Senior Notes due 2023 | Prior to January 15, 2018 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior notes, redemption price percentage, make whole premium |  | 100.00%lea_DebtRedemptionPricePercentOfParMakeWholePremium / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / lea_PeriodAxis = lea_PriorToJanuaryFifteenTwoThousandEighteenMember | 100.00%lea_DebtRedemptionPricePercentOfParMakeWholePremium / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / lea_PeriodAxis = lea_PriorToJanuaryFifteenTwoThousandEighteenMember |  |  |  |  |  |  |  |
4.75% Senior Notes due 2023 | Prior to January 15, 2016 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of debt redemption price |  |  | 104.75%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / lea_PeriodAxis = lea_PriorToJanuaryFifteenTwoThousandSixteenMember |  |  |  |  |  |  |  |
Senior notes, redeemable percentage of the aggregate principal amount of the Notes in equity offerings |  |  | 35.00%lea_PercentageOfRedeemableNotesMaximumEquityOffering / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / lea_PeriodAxis = lea_PriorToJanuaryFifteenTwoThousandSixteenMember |  |  |  |  |  |  |  |
Outstanding original aggregate principal amount |  |  | 65.00%lea_PercentageOfRedeemableNotesMinimum / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / lea_PeriodAxis = lea_PriorToJanuaryFifteenTwoThousandSixteenMember |  |  |  |  |  |  |  |
8.125% Senior Notes due 2020 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of debt redemption | 10.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwentyTwentyMember |  |  |  |  |  |  |  |  |  |
Percentage of debt redemption price |  |  | 104.063%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwentyTwentyMember |  |  |  |  |  |  |  |
Restricted cash, current |  | 250,000,000 us-gaap_RestrictedCashAndInvestmentsCurrent / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwentyTwentyMember | 250,000,000 us-gaap_RestrictedCashAndInvestmentsCurrent / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwentyTwentyMember |  |  |  |  |  |  |  |
5.375% Senior Notes due 2024 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount |  | 325,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember | 325,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember |  |  |  |  |  |  |  |
Stated coupon rate |  | 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember | 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember |  |  |  |  |  |  |  |
Long-term debt, yield to maturity |  | 5.375%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember | 5.375%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember |  |  |  |  |  |  |  |
Proceeds from issuance of debt | 325,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember |  |  |  |  |  |  |  |  |  |
Debt issuance cost | 3,900,000 us-gaap_DebtIssuanceCosts / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember |  |  |  |  |  |  |  |  |  |
Debt instrument, payment terms |  |  | Interest is payable on March 15 and September 15 of each year. |  |  |  |  |  |  |  |
Description of notes restrictive covenants |  |  | Subject to certain exceptions, the indentures governing the 2023 Notes, 2024 Notes and 2025 Notes contain restrictive covenants that, among other things, limit the ability of the Company to: (i) create or permit certain liens and (ii) consolidate or merge or sell all or substantially all of the Company’s assets. In addition, the indentures governing the 2023 Notes and 2024 Notes limit the ability of the Company to enter into sale and leaseback transactions. The indentures governing the Notes also provide for customary events of default. |  |  |  |  |  |  |  |
5.375% Senior Notes due 2024 | Prior to March 15, 2017 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of debt redemption price |  |  | 105.375%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / lea_PeriodAxis = lea_PriorToMarchFifteenTwoThousandSeventeenMember |  |  |  |  |  |  |  |
Senior notes, redeemable percentage of the aggregate principal amount of the Notes in equity offerings |  |  | 35.00%lea_PercentageOfRedeemableNotesMaximumEquityOffering / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / lea_PeriodAxis = lea_PriorToMarchFifteenTwoThousandSeventeenMember |  |  |  |  |  |  |  |
Outstanding original aggregate principal amount |  |  | 65.00%lea_PercentageOfRedeemableNotesMinimum / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / lea_PeriodAxis = lea_PriorToMarchFifteenTwoThousandSeventeenMember |  |  |  |  |  |  |  |
Redemption of notes |  |  | 90 years |  |  |  |  |  |  |  |
5.375% Senior Notes due 2024 | Prior to March 15, 2019 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of debt redemption price |  |  | 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / lea_PeriodAxis = lea_PriorToMarchFifteenTwoThousandNineteenMember |  |  |  |  |  |  |  |
5.25% Senior Notes due 2025 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount |  | 650,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember | 650,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember |  |  |  |  |  |  |  |
Stated coupon rate |  | 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember | 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember |  |  |  |  |  |  |  |
Long-term debt, yield to maturity |  | 5.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember | 5.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember |  |  |  |  |  |  |  |
Debt instrument, payment terms |  |  | Interest is payable on January 15 and July 15 of each year. |  |  |  |  |  |  |  |
Description of notes restrictive covenants |  |  | Subject to certain exceptions, the indentures governing the 2023 Notes, 2024 Notes and 2025 Notes contain restrictive covenants that, among other things, limit the ability of the Company to: (i) create or permit certain liens and (ii) consolidate or merge or sell all or substantially all of the Company’s assets. In addition, the indentures governing the 2023 Notes and 2024 Notes limit the ability of the Company to enter into sale and leaseback transactions. The indentures governing the Notes also provide for customary events of default. |  |  |  |  |  |  |  |
5.25% Senior Notes due 2025 | Prior to January 15, 2020 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of debt redemption price |  |  | 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / lea_PeriodAxis = lea_PriorToJanuaryFifteenTwoThousandTwentyMember |  |  |  |  |  |  |  |
Redemption of notes |  |  | 120 days |  |  |  |  |  |  |  |
5.25% Senior Notes due 2025 | Prior to January 15, 2018 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of debt redemption price |  |  | 105.25%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / lea_PeriodAxis = lea_PriorToJanuaryFifteenTwoThousandEighteenMember |  |  |  |  |  |  |  |
Senior notes, redeemable percentage of the aggregate principal amount of the Notes in equity offerings |  |  | 40.00%lea_PercentageOfRedeemableNotesMaximumEquityOffering / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / lea_PeriodAxis = lea_PriorToJanuaryFifteenTwoThousandEighteenMember |  |  |  |  |  |  |  |
Outstanding original aggregate principal amount |  |  | 50.00%lea_PercentageOfRedeemableNotesMinimum / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / lea_PeriodAxis = lea_PriorToJanuaryFifteenTwoThousandEighteenMember |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  |  |  |  |  | 1,250,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  | 1,000,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Loss on extinguishment of debt |  |  |  |  |  | 400,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |
Debt issuance cost |  |  |  |  |  | 5,800,000 us-gaap_DebtIssuanceCosts / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |
Term Loan Facility | Eurodollar |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum interest rate margin |  |  | 1.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_CreditFacilityAxis = lea_TermLoanFacilityMember / us-gaap_DebtInstrumentAxis = us-gaap_EurodollarMember |  |  |  |  |  |  |  |
Maximum interest rate margin |  |  | 2.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_CreditFacilityAxis = lea_TermLoanFacilityMember / us-gaap_DebtInstrumentAxis = us-gaap_EurodollarMember |  |  |  |  |  |  |  |
Term Loan Facility | Base Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum interest rate margin |  |  | 0.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_CreditFacilityAxis = lea_TermLoanFacilityMember / us-gaap_DebtInstrumentAxis = us-gaap_BaseRateMember |  |  |  |  |  |  |  |
Maximum interest rate margin |  |  | 1.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_CreditFacilityAxis = lea_TermLoanFacilityMember / us-gaap_DebtInstrumentAxis = us-gaap_BaseRateMember |  |  |  |  |  |  |  |
Subsequent event | Eagle Ottawa | 5.25% Senior Notes due 2025 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  | 350,000,000 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_BusinessAcquisitionAxis = lea_EagleOttawaMember / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Subsequent event | Eagle Ottawa | Term Loan Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  | $ 500,000,000 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_BusinessAcquisitionAxis = lea_EagleOttawaMember / us-gaap_DebtInstrumentAxis = lea_TermLoanFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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