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Quarterly Financial Data - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 31, 2013 | Jun. 29, 2013 | Aug. 24, 2012
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Losses related to redemption of remaining aggregate principal | $ 17.5 us-gaap_GainsLossesOnExtinguishmentOfDebt | $ 17.9 us-gaap_GainsLossesOnExtinguishmentOfDebt | $ 3.6 us-gaap_GainsLossesOnExtinguishmentOfDebt | $ 3.7 us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |
Provision (benefit) for income taxes |  | 121.4 us-gaap_IncomeTaxExpenseBenefit | 192.7 us-gaap_IncomeTaxExpenseBenefit | (638.0)us-gaap_IncomeTaxExpenseBenefit |  |  |  |  |  |
Valuation allowance of deferred tax assets and other items |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Provision (benefit) for income taxes | (108.9)us-gaap_IncomeTaxExpenseBenefit / lea_IncomeTaxesAxis = lea_ValuationAllowanceOfDeferredTaxAssetsAndOtherItemsMember |  |  |  | (6.9)us-gaap_IncomeTaxExpenseBenefit / lea_IncomeTaxesAxis = lea_ValuationAllowanceOfDeferredTaxAssetsAndOtherItemsMember | (17.9)us-gaap_IncomeTaxExpenseBenefit / lea_IncomeTaxesAxis = lea_ValuationAllowanceOfDeferredTaxAssetsAndOtherItemsMember | (15.4)us-gaap_IncomeTaxExpenseBenefit / lea_IncomeTaxesAxis = lea_ValuationAllowanceOfDeferredTaxAssetsAndOtherItemsMember | 16.0 us-gaap_IncomeTaxExpenseBenefit / lea_IncomeTaxesAxis = lea_ValuationAllowanceOfDeferredTaxAssetsAndOtherItemsMember | (21.5)us-gaap_IncomeTaxExpenseBenefit / lea_IncomeTaxesAxis = lea_ValuationAllowanceOfDeferredTaxAssetsAndOtherItemsMember |
2018 notes |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Losses related to redemption of remaining aggregate principal |  |  |  |  |  |  | $ 17.5 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwentyEighteenMember |  |  |
8.125% Senior Notes due 2020 |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of debt redemption |  |  |  |  |  |  | 10.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember |  |  | 10.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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