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Pension and Other Postretirement Benefit Plans - Information Related to Multi-Employer Pension Plans (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
516099782-001      
Multiemployer Plans [Line Items]      
Employer identification number 516099782    
Multiemployer plan number 001    
Pension protection act zone status certification Green Green  
FIP/RP pending or implemented No    
Surcharge No    
Contributions to multiemployer pension plan $ 0.6us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= lea_GroupOneMember
$ 0.4us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= lea_GroupOneMember
$ 0.5us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= lea_GroupOneMember
13-6130178      
Multiemployer Plans [Line Items]      
Employer identification number 136130178    
Pension protection act zone status certification Red Red  
FIP/RP pending or implemented Implemented Implemented  
Surcharge Yes    
Contributions to multiemployer pension plan $ 0.3us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= lea_GroupTwoMember
$ 0.2us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= lea_GroupTwoMember
$ 0.1us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= lea_GroupTwoMember