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Capital Stock and Equity - Capital Stock and Equity - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 48 Months Ended |  |  |
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Dec. 31, 2014 Vote | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 31, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2014 Vote | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 Vote | Nov. 09, 2009 | Mar. 31, 2014 | Apr. 25, 2013
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 300,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  | 300,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  |  | 300,000,000 us-gaap_CommonStockSharesAuthorized | 300,000,000 us-gaap_CommonStockSharesAuthorized |  | 300,000,000 us-gaap_CommonStockSharesAuthorized |  |  |
Common stock holders voting right, vote per outstanding share | 1 lea_CommonStockVotesPerShare |  |  |  |  |  |  |  |  | 1 lea_CommonStockVotesPerShare |  |  | 1 lea_CommonStockVotesPerShare |  |  |
Common stock, aggregate authorized repurchase amount | $ 2,250,000,000.00 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |  |  |  |  |  |  |  | $ 2,250,000,000.00 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |  | $ 2,250,000,000.00 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |  |
Amount paid in accelerated stock repurchase agreement |  |  | 55,500,000 us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, repurchased |  |  |  |  |  |  |  |  |  | 3,805,114 us-gaap_TreasuryStockSharesAcquired | 15,533,758 us-gaap_TreasuryStockSharesAcquired | 5,357,443 us-gaap_TreasuryStockSharesAcquired |  |  |  |
Common stock, share repurchase program amount | 338,600,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |  |  |  |  |  |  | 338,600,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  | 338,600,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |
Common stock, at an average purchase price excluding commission |  |  |  |  |  |  |  |  |  | $ 93.52 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 54.08 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 41.59 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 61.97 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  | 411,400,000 us-gaap_PaymentsForRepurchaseOfCommonStock | 1,000,100,000 us-gaap_PaymentsForRepurchaseOfCommonStock | 222,800,000 us-gaap_PaymentsForRepurchaseOfCommonStock | 1,900,000,000 us-gaap_PaymentsForRepurchaseOfCommonStock |  |  |
Treasury stock, shares retired |  |  |  |  |  |  |  |  |  | 8,000,000 us-gaap_TreasuryStockSharesRetired | 20,000,000 us-gaap_TreasuryStockSharesRetired |  |  |  |  |
Cash dividends declared per share | $ 0.20 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.20 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.20 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.20 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.17 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.17 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.17 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.17 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.14 us-gaap_CommonStockDividendsPerShareDeclared |  |  |  |  |  |  |
Dividends declared to Lear Corporation stockholders |  |  |  |  |  |  |  |  |  | 67,100,000 us-gaap_DividendsCommonStockCash | 59,400,000 us-gaap_DividendsCommonStockCash | 56,100,000 us-gaap_DividendsCommonStockCash |  |  |  |
Dividends paid to Lear Corporation stockholders |  |  |  |  |  |  |  |  |  | 65,300,000 us-gaap_PaymentsOfDividendsCommonStock | 58,400,000 us-gaap_PaymentsOfDividendsCommonStock | 54,600,000 us-gaap_PaymentsOfDividendsCommonStock |  |  |  |
Warrants outstanding |  |  |  |  | 279,094 us-gaap_ClassOfWarrantOrRightOutstanding |  |  |  |  |  | 279,094 us-gaap_ClassOfWarrantOrRightOutstanding |  |  | 8,157,249 us-gaap_ClassOfWarrantOrRightOutstanding |  |
Exercisable of warrants into common stock |  |  |  |  | 558,188 lea_CommonStockIssuableUponExerciseOfWarrants |  |  |  |  |  | 558,188 lea_CommonStockIssuableUponExerciseOfWarrants |  |  |  |  |
Number of shares called by warrants | 2 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  |  |  |  |  |  |  | 2 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  | 2 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  |
Exercise price of warrants | $ 0.005 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  |  |  |  |  |  |  | $ 0.005 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  | $ 0.005 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  |
Additional paid-in capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of shares held in treasury |  |  |  |  |  |  |  |  |  |  | 389,700,000 us-gaap_TreasuryStockRetiredCostMethodAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of shares held in treasury |  |  |  |  |  |  |  |  |  |  | 200,000 us-gaap_TreasuryStockRetiredCostMethodAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_CommonStockMember |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of shares held in treasury |  |  |  |  |  |  |  |  |  |  | 600,700,000 us-gaap_TreasuryStockRetiredCostMethodAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_RetainedEarningsMember |  |  |  |  |
Treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of shares held in treasury |  |  |  |  |  |  |  |  |  |  | (990,600,000)us-gaap_TreasuryStockRetiredCostMethodAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_TreasuryStockMember |  |  |  |  |
Open market repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  | 355,900,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_ShareRepurchaseProgramAxis = lea_OpenMarketRepurchasesMember |  |  |  |  |  |
Accelerated share repurchase agreement | Share repurchase program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, aggregate authorized repurchase amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / lea_AcceleratedShareRepurchasesAxis = lea_AcceleratedShareRepurchaseAgreementMember / us-gaap_ShareRepurchaseProgramAxis = lea_ShareRepurchaseProgramTwentyThirteenMember
Amount paid in accelerated stock repurchase agreement | 855,500,000 us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt / lea_AcceleratedShareRepurchasesAxis = lea_AcceleratedShareRepurchaseAgreementMember / us-gaap_ShareRepurchaseProgramAxis = lea_ShareRepurchaseProgramTwentyThirteenMember |  | 55,500,000 us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt / lea_AcceleratedShareRepurchasesAxis = lea_AcceleratedShareRepurchaseAgreementMember / us-gaap_ShareRepurchaseProgramAxis = lea_ShareRepurchaseProgramTwentyThirteenMember |  |  |  | 800,000,000 us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt / lea_AcceleratedShareRepurchasesAxis = lea_AcceleratedShareRepurchaseAgreementMember / us-gaap_ShareRepurchaseProgramAxis = lea_ShareRepurchaseProgramTwentyThirteenMember |  |  | 855,500,000 us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt / lea_AcceleratedShareRepurchasesAxis = lea_AcceleratedShareRepurchaseAgreementMember / us-gaap_ShareRepurchaseProgramAxis = lea_ShareRepurchaseProgramTwentyThirteenMember |  |  | 855,500,000 us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt / lea_AcceleratedShareRepurchasesAxis = lea_AcceleratedShareRepurchaseAgreementMember / us-gaap_ShareRepurchaseProgramAxis = lea_ShareRepurchaseProgramTwentyThirteenMember |  |  |
Final price paid per share |  |  |  |  |  |  |  |  |  | $ 72.11 us-gaap_AcceleratedShareRepurchasesFinalPricePaidPerShare / lea_AcceleratedShareRepurchasesAxis = lea_AcceleratedShareRepurchaseAgreementMember / us-gaap_ShareRepurchaseProgramAxis = lea_ShareRepurchaseProgramTwentyThirteenMember |  |  |  |  |  |
Common stock, repurchased |  |  |  |  |  |  | 11,862,836 us-gaap_TreasuryStockSharesAcquired / lea_AcceleratedShareRepurchasesAxis = lea_AcceleratedShareRepurchaseAgreementMember / us-gaap_ShareRepurchaseProgramAxis = lea_ShareRepurchaseProgramTwentyThirteenMember |  |  |  |  |  |  |  |  |
Excess shares delivered under ASR |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 658,903 lea_ExcessSharesDeliveredUnderASR / lea_AcceleratedShareRepurchasesAxis = lea_AcceleratedShareRepurchaseAgreementMember / us-gaap_ShareRepurchaseProgramAxis = lea_ShareRepurchaseProgramTwentyThirteenMember |
Percentage of treasury stock repurchased |  |  |  |  |  |  | 80.00%lea_TreasuryStockPercentageAcquired / lea_AcceleratedShareRepurchasesAxis = lea_AcceleratedShareRepurchaseAgreementMember / us-gaap_ShareRepurchaseProgramAxis = lea_ShareRepurchaseProgramTwentyThirteenMember |  |  |  |  |  |  |  |  |
Value of common stock repurchased, per share |  |  |  |  |  |  | $ 53.95 us-gaap_AcceleratedShareRepurchasesInitialPricePaidPerShare / lea_AcceleratedShareRepurchasesAxis = lea_AcceleratedShareRepurchaseAgreementMember / us-gaap_ShareRepurchaseProgramAxis = lea_ShareRepurchaseProgramTwentyThirteenMember |  |  |  |  |  |  |  |  |
Treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of shares held in treasury |  |  |  |  |  |  |  |  |  | (519,900,000)us-gaap_TreasuryStockRetiredCostMethodAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (990,600,000)us-gaap_TreasuryStockRetiredCostMethodAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of shares held in treasury |  |  |  |  |  |  |  |  |  | 363,900,000 us-gaap_TreasuryStockRetiredCostMethodAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 600,700,000 us-gaap_TreasuryStockRetiredCostMethodAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |
Dividends declared to Lear Corporation stockholders |  |  |  |  |  |  |  |  |  | 67,100,000 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 59,400,000 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 56,100,000 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Additional paid-in capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of shares held in treasury |  |  |  |  |  |  |  |  |  | 155,900,000 us-gaap_TreasuryStockRetiredCostMethodAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 389,700,000 us-gaap_TreasuryStockRetiredCostMethodAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of shares held in treasury |  |  |  |  |  |  |  |  |  | $ 100,000 us-gaap_TreasuryStockRetiredCostMethodAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 200,000 us-gaap_TreasuryStockRetiredCostMethodAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |

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- Definition Number of shares of common stock issuable upon exercise of warrants. + References No definition available. + Details
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- Definition Excess Shares Delivered Under ASR + References No definition available. + Details
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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition The price paid per share to immediately purchase the targeted number of shares on the date of executing the accelerated share repurchase agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + 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.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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.(i)(2)) -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 i -Subparagraph 2 -Article 4 + Details
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- Definition Number of warrants or rights outstanding. + 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.(i)) -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 i -Article 4 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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