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Long-Term Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Property, Plant and Equipment [Line Items]    
Depreciation expense $ 71.2us-gaap_Depreciation $ 66.0us-gaap_Depreciation
Restructuring charges 7.3us-gaap_RestructuringCharges  
Corporate and regional headquarters and elimination of intercompany activity (Other)    
Property, Plant and Equipment [Line Items]    
Fixed asset impairment charges 0.5us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ lea_ImpairmentChargeByTypeAxis
= lea_AllOtherMember
 
Asset impairment charges    
Property, Plant and Equipment [Line Items]    
Restructuring charges $ 1.1us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= lea_AssetImpairmentChargeMember