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Pre-Production Costs Related to Long-Term Supply Agreements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 29, 2014 | Mar. 30, 2013
Preproduction Costs Related To Long Term Supply Arrangements [Abstract] |  |
Capitalized pre-production E&D costs | $ 42.3 | $ 50.3
Capitalized pre-production tooling costs related to customer-owned tools | 66.3 | 47.0
Cash collected related to E&D and tooling costs | $ 103.2 | $ 105.4

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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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- 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_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- 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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Balance Type: | debit
Period Type: | duration

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- Details
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