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Debt - Summary of Long-Term Debt and Related Weighted Average Interest Rates, Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended
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Mar. 29, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Aug. 24, 2012 | Mar. 29, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Repurchase of senior notes | $ 327.1 us-gaap_RepaymentsOfUnsecuredDebt | $ 327.1 us-gaap_RepaymentsOfUnsecuredDebt | $ 72.1 us-gaap_RepaymentsOfUnsecuredDebt | $ 72.1 us-gaap_RepaymentsOfUnsecuredDebt |  |
Compliance with covenants under Notes |  | As of December 31, 2014, the Company was in compliance with all covenants under the indentures governing the Notes. |  |  |  |
7.875% Senior Notes due 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, stated coupon rate |  | 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandEighteenMember | 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandEighteenMember |  |  |
Percentage of debt redemption |  |  |  | 10.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandEighteenMember |  |
8.125% Senior Notes due 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, stated coupon rate |  | 8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember | 8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / 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 |
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, stated coupon rate |  | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember |  |  |
Debt instrument, payment terms |  | Interest is payable on January 15 and July 15 of each year |  |  |  |
Debt instrument, redemption, description |  | Prior to January 15, 2016, the Company may redeem up to 35% of the aggregate principal amount of the 2023 Notes, in an amount not to exceed the amount of net cash proceeds of one or more equity offerings, at a redemption price equal to 104.75% of the aggregate principal amount thereof, plus accrued and unpaid interest to the redemption date, provided that at least 65% of the original aggregate principal amount of the 2023 Notes remains outstanding after the redemption and any such redemption is made within 90 days after the closing of such equity offering. Prior to January 15, 2018, the Company may redeem the 2023 Notes, in whole or in part, at a redemption price equal to 100% of the aggregate principal amount thereof, plus a "make-whole" premium as of, and accrued and unpaid interest to, the redemption date |  |  |  |
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 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, stated coupon rate |  | 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember |  |  |  |
Debt instrument, payment terms |  | Interest is payable on March 15 and September 15 of each year. |  |  |  |
Debt instrument, redemption, description |  | Prior to March 15, 2017, the Company may redeem up to 35% of the aggregate principal amount of the 2024 Notes, in an amount not to exceed the amount of net cash proceeds of one or more equity offerings, at a redemption price equal to 105.375% of the aggregate principal amount thereof, plus accrued and unpaid interest to the redemption date, provided that at least 65% of the original aggregate principal amount of the 2024 Notes remains outstanding after the redemption and any such redemption is made within 90 days after the closing of such equity offering. Prior to March 15, 2019, the Company may redeem the 2024 Notes, in whole or in part, at a redemption price equal to 100% of the aggregate principal amount thereof, plus a "make-whole" premium as of, and accrued and unpaid interest to, the redemption date. |  |  |  |
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 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, stated coupon rate |  | 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember |  |  |  |
Debt instrument, payment terms |  | Interest is payable on January 15 and July 15 of each year. |  |  |  |
Debt instrument, redemption, description |  | Prior to January 15, 2018, the Company may redeem up to 40% of the aggregate principal amount of the 2025 Notes, in an amount not to exceed the amount of net cash proceeds of one or more equity offerings, at a redemption price equal to 105.25% of the aggregate principal amount thereof, plus accrued and unpaid interest to the redemption date, provided that at least 50% of the original aggregate principal amount of the 2025 Notes remains outstanding after the redemption and any such redemption is made within 120 days after the closing of such equity offering. Prior to January 15, 2020, the Company may redeem the 2025 Notes, in whole or in part, at a redemption price equal to 100% of the aggregate principal amount thereof, plus a "make-whole" premium as of, and accrued and unpaid interest to, the redemption date. |  |  |  |
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. |  |  |  |

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- Definition States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of covenants that limit or prohibit certain actions or activities without the lender's prior consent within a specified period of time or until certain specified targets are achieved for example, reduction of the debt or an increase in net worth to a specified amount). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph e -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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