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Information Related to Multi-Employer Pension Plans (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2011
Minimum
Multiemployer Plans [Line Items]
Contributions made by the Company as percentage of total contributions	5.00%
13-6130178
Multiemployer Plans [Line Items]
Total plan assets as percentage of accumulated benefit obligation	Less than 65 percent

X

- Definition

Multiemployer Plan Contributions Percentage

+ References

No definition available.

+ Details

Name:	lea_MultiemployerPlanContributionsPercentage
Namespace Prefix:	lea_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Indicate whether the multiemployer plan is less than 65 percent funded, between 65 and less than 80 percent funded, or at least 80 percent funded. The acceptable values are: (1) "less than 65 percent", (2) "between 65 and less than 80 percent", (3) "at least 80 percent", and (4) "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

+ Details

Name:	us-gaap_MultiemployerPlansFundedStatus
Namespace Prefix:	us-gaap_
Data Type:	us-types:fundedStatusItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_MultiemployerPlansLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration