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Comprehensive Income and Equity - Additional Information (Detail) (USD $)
 3 Months Ended 51 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Mar. 28, 2015
Feb. 28, 2015
Equity [Abstract]        
Defined benefits plans, pretax reclassification adjustments for accumulated gains (losses) $ (1,500,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax      
Derivative instruments and hedging activities, pretax reclassification adjustments for accumulated gains (losses) (4,700,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax 1,000,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax    
Foreign currency translation adjustments related to intercompany transactions, long-term gain (loss) (13,400,000)us-gaap_AdjustmentForLongTermIntercompanyTransactionsGrossOfTax 500,000us-gaap_AdjustmentForLongTermIntercompanyTransactionsGrossOfTax    
Increase in existing common stock share repurchase program       661,000,000lea_StockRepurchaseProgramAdditionalAuthorizedAmount
Aggregate purchases authorized under common stock share repurchase program 2,900,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1   2,900,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 1,000,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Payments for repurchases of outstanding common stock 112,400,000us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock 2,000,000,000us-gaap_PaymentsForRepurchaseOfCommonStock  
Common stock repurchased 1,030,261us-gaap_TreasuryStockSharesAcquired      
Common stock repurchased, average price per share (in dollars per share) $ 109.09us-gaap_TreasuryStockAcquiredAverageCostPerShare   $ 63.49us-gaap_TreasuryStockAcquiredAverageCostPerShare  
Common stock, share repurchase program, remaining authorized amount 887,600,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1   887,600,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1  
Cash dividends declared per share (in dollars per share) $ 0.25us-gaap_CommonStockDividendsPerShareDeclared $ 0.2us-gaap_CommonStockDividendsPerShareDeclared    
Dividends declared 20,300,000us-gaap_DividendsCommonStockCash 17,200,000us-gaap_DividendsCommonStockCash    
Dividends paid $ 22,000,000us-gaap_PaymentsOfDividendsCommonStock $ 17,500,000us-gaap_PaymentsOfDividendsCommonStock