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Pre-Production Costs Related to Long-Term Supply Agreements - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended
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Sep. 26, 2015 | Sep. 27, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Capitalized pre-production E&D costs | $ 115.9 | $ 143.0
Capitalized pre-production tooling costs related to customer-owned tools | 74.8 | 118.2
Cash collected related to E&D and tooling costs | $ 155.6 | $ 247.2

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- Definition Amount of recoverable preproduction engineering and design costs related to long term supply agreements capitalized during the reporting period. + References No definition available. + Details
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X
- Definition Amount of recoverable preproduction tooling costs related to long term supply agreements capitalized during the reporting period. + References No definition available. + Details
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Namespace Prefix: | lea_
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X
- Definition Cash recoveries of preproduction engineering, design and tooling costs incurred on behalf of a customer. + References No definition available. + Details
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Namespace Prefix: | lea_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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