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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
	Mar. 28, 2015	Mar. 29, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Capitalized pre-production E&D costs	$ 49.9lea_PreproductionEngineeringAndDevelopmentCostsRelatedToLongTermSupplyArrangementsCostsCapitalized	$ 42.3lea_PreproductionEngineeringAndDevelopmentCostsRelatedToLongTermSupplyArrangementsCostsCapitalized
Capitalized pre-production tooling costs related to customer-owned tools	37.8lea_PreproductionToolingCostsRelatedToLongTermSupplyArrangementsCostsCapitalized	66.3lea_PreproductionToolingCostsRelatedToLongTermSupplyArrangementsCostsCapitalized
Cash collected related to E&D and tooling costs	$ 76.3lea_RecoveriesOfPreproductionCostsRelatedToLongTermSupplyAgreements	$ 103.2lea_RecoveriesOfPreproductionCostsRelatedToLongTermSupplyAgreements

X

- 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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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
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