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Debt - Redemption Prices (Detail)	0 Months Ended	12 Months Ended
	Aug. 24, 2012	Dec. 31, 2014
8.125% Senior Notes due 2020
Debt Instrument [Line Items]
Percentage of debt redemption price	1.03%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember
4.75% Senior Notes due 2023 | Debt instrument redemption period one
Debt Instrument [Line Items]
Percentage of debt redemption price		102.375%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodOneMember / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember
4.75% Senior Notes due 2023 | Debt instrument redemption period two
Debt Instrument [Line Items]
Percentage of debt redemption price		101.583%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodTwoMember / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember
4.75% Senior Notes due 2023 | Debt instrument redemption period three
Debt Instrument [Line Items]
Percentage of debt redemption price		100.792%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodThreeMember / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember
4.75% Senior Notes due 2023 | Debt instrument redemption period four and thereafter
Debt Instrument [Line Items]
Percentage of debt redemption price		100.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodFourMember / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember
5.375% Senior Notes due 2024 | Debt instrument redemption period one
Debt Instrument [Line Items]
Percentage of debt redemption price		102.688%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodOneMember / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember
5.375% Senior Notes due 2024 | Debt instrument redemption period two
Debt Instrument [Line Items]
Percentage of debt redemption price		101.792%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodTwoMember / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember
5.375% Senior Notes due 2024 | Debt instrument redemption period three
Debt Instrument [Line Items]
Percentage of debt redemption price		100.896%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodThreeMember / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember
5.375% Senior Notes due 2024 | Debt instrument redemption period four and thereafter
Debt Instrument [Line Items]
Percentage of debt redemption price		100.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodFourMember / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember
5.25% Senior Notes due 2025 | Debt instrument redemption period one
Debt Instrument [Line Items]
Percentage of debt redemption price		102.625%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodOneMember / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember
5.25% Senior Notes due 2025 | Debt instrument redemption period two
Debt Instrument [Line Items]
Percentage of debt redemption price		101.75%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodTwoMember / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember
5.25% Senior Notes due 2025 | Debt instrument redemption period three
Debt Instrument [Line Items]
Percentage of debt redemption price		100.875%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodThreeMember / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember
5.25% Senior Notes due 2025 | Debt instrument redemption period four and thereafter
Debt Instrument [Line Items]
Percentage of debt redemption price		100.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodFourMember / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph e

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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