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Supplemental Guarantor Condensed Consolidating Financial Statements - Additional Information (Detail) - USD ($)	3 Months Ended			9 Months Ended
	Oct. 01, 2016		Sep. 26, 2015	Oct. 01, 2016		Sep. 26, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Percentage owned, domestic subsidiaries				100.00%
Selling, general and administrative expenses allocated from Lear	$ 36,400,000		$ 33,400,000	$ 103,900,000		$ 97,200,000
Long-term Debt
Long-term debt and other, net	1,939,900,000			1,939,900,000			$ 1,954,800,000
Less — Current portion	(32,600,000)	[1]		(32,600,000)	[1]		(23,100,000)
Long-term debt	1,907,300,000	[1]		1,907,300,000	[1]		$ 1,931,700,000
4.75% Senior Notes due 2023 | Senior notes
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount	$ 500,000,000			$ 500,000,000
Long-term debt, stated coupon rate	4.75%			4.75%			4.75%
5.375% Senior Notes due 2024 | Senior notes
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount	$ 325,000,000			$ 325,000,000
Long-term debt, stated coupon rate	5.375%			5.375%			5.375%
5.25% Senior Notes due 2025 | Senior notes
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount	$ 650,000,000			$ 650,000,000
Long-term debt, stated coupon rate	5.25%			5.25%			5.25%
Lear
Long-term Debt
Long-term debt and other, net	$ 1,933,500,000			$ 1,933,500,000			$ 1,947,200,000
Less — Current portion	(31,300,000)			(31,300,000)			(21,900,000)
Long-term debt	1,902,200,000			1,902,200,000			1,925,300,000
Lear | Senior notes
Long-term Debt
Long-term debt and other, net	1,460,300,000			1,460,300,000			1,458,800,000
Term Loan Facility | Lear | Credit Agreement — Term Loan Facility
Long-term Debt
Long-term debt and other, net	$ 473,200,000			$ 473,200,000			$ 488,400,000
[1] Unaudited.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-Section S99
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