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Supplemental Guarantor Consolidating Financial Statements - Supplemental Guarantor Consolidating Financial Statements - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |
Selling, general and administrative expenses allocated from Lear | $ 121,800,000 lea_AllocationOfOperatingCosts | $ 111,500,000 lea_AllocationOfOperatingCosts | $ 38,100,000 lea_AllocationOfOperatingCosts
8.125% Senior Notes due 2020 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Long-term debt, aggregate principal amount | 245,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember |  |
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 |
4.75% Senior Notes due 2023 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Long-term debt, aggregate principal amount | 500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember |  |
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 |
5.375% Senior Notes due 2024 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Long-term debt, aggregate principal amount | 325,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember |  |
Long-term debt, stated coupon rate | 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember |  |
5.25% Senior Notes due 2025 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Long-term debt, aggregate principal amount | $ 650,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember |  |
Long-term debt, stated coupon rate | 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember |  |

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- Definition Amount of corporate and division operating costs allocated between the Parent and its subsidiaries. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + 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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