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Classification of Recoverable Customer Engineering, Development and Tooling Costs Related to Long-term Supply Agreements (Detail) (USD $) In Millions, unless otherwise specified	Sep. 28, 2013	Dec. 31, 2012
Pre Production Costs Related to Long Term Supply Arrangements [Line Items]
Current	$ 155.1	$ 141.8
Long-term	51.4	55.0
Recoverable customer engineering, development and tooling	$ 206.5	$ 196.8

X

- Definition

Amounts due from customers within one year of the balance sheet date related to outstanding recoverable customer engineering, development and tooling balances.

+ References

No definition available.

+ Details

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Namespace Prefix:	lea_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:	lea_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amounts due from customers after one year from the balance sheet date related to outstanding recoverable customer engineering, development and tooling balances.

+ References

No definition available.

+ Details

Name:	lea_PreproductionCostsRelatedToLongTermSupplyArrangementsNoncurrent
Namespace Prefix:	lea_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The carrying amount as of the balance sheet date of capitalized preproduction costs incurred on long-term supply arrangements, including recoverable costs to design and develop products.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 340

-SubTopic 10

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6387057&loc=d3e6169-108318



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 340

-SubTopic 10

-Section 25

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6387057&loc=d3e6233-108318



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 340

-SubTopic 10

-Section S99

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=27011391&loc=d3e105117-122735

+ Details

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