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Supplemental Guarantor Condensed Consolidating Financial Statements - Summary of Long-Term Debt of Lear and Guarantors on Combined Basis (Detail) (USD $)	3 Months Ended
	Mar. 28, 2015		Mar. 29, 2014	Dec. 31, 2014	Nov. 30, 2014
Debt Instrument [Line Items]
Selling, general and administrative expenses allocated from Lear	$ 30,800,000lea_AllocationOfOperatingCosts		$ 30,600,000lea_AllocationOfOperatingCosts
Long-term Debt
Long-term debt, total	1,983,000,000us-gaap_DebtAndCapitalLeaseObligations			1,718,700,000us-gaap_DebtAndCapitalLeaseObligations
Less — Current portion	(10,600,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent	[1]		(243,700,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term debt	1,972,400,000us-gaap_LongTermDebtAndCapitalLeaseObligations	[1]		1,475,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations
4.75% Senior Notes due 2023 | Senior notes
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount	500,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Long-term debt, stated coupon rate	4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember			4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Long-term Debt
Long-term debt, total	500,000,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember			500,000,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
5.375% Senior Notes due 2024 | Senior notes
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount	325,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Long-term debt, stated coupon rate	5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember			5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Long-term Debt
Long-term debt, total	325,000,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember			325,000,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
5.25% Senior Notes due 2025 | Senior notes
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount	650,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Long-term debt, stated coupon rate	5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember			5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember	5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Long-term Debt
Long-term debt, total	650,000,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember			650,000,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Credit Agreement — Term Loan Facility | Term Loan Facility
Long-term Debt
Long-term debt, total	500,000,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember			0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember
Parent company
Long-term Debt
Long-term debt, total	1,975,000,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember			1,718,700,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Less — Current portion	(9,400,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember			(243,700,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Long-term debt	1,965,600,000us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember			1,475,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Parent company | Senior notes
Long-term Debt
Long-term debt, total	1,475,000,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember			1,718,700,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Parent company | Credit Agreement — Term Loan Facility | Term Loan Facility
Long-term Debt
Long-term debt, total	$ 500,000,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember			$ 0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
[1] Unaudited.

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