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Supplemental Guarantor Condensed Consolidating Financial Statements - Summary of Long-Term Debt of Lear and Guarantors on Combined Basis (Detail)	3 Months Ended			9 Months Ended
	Sep. 26, 2015 USD ($)		Sep. 27, 2014 USD ($)	Sep. 26, 2015 USD ($)		Sep. 27, 2014 USD ($)	Dec. 31, 2014 USD ($)	Nov. 30, 2014
Debt Instrument [Line Items]
Percentage owned, domestic subsidiaries				1
Selling, general and administrative expenses allocated from Lear	$ 33,400,000		$ 30,700,000	$ 97,200,000		$ 90,500,000
Long-term Debt
Long-term debt, total	1,979,500,000			1,979,500,000			$ 1,718,700,000
Less — Current portion	(16,900,000)	[1]		(16,900,000)	[1]		(243,700,000)
Long-term debt	1,962,600,000	[1]		1,962,600,000	[1]		$ 1,475,000,000
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%
Long-term Debt
Long-term debt, total	$ 500,000,000			$ 500,000,000			$ 500,000,000
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%
Long-term Debt
Long-term debt, total	$ 325,000,000			$ 325,000,000			$ 325,000,000
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%	5.25%
Long-term Debt
Long-term debt, total	$ 650,000,000			$ 650,000,000			$ 650,000,000
Credit Agreement — Term Loan Facility | Term Loan Facility
Long-term Debt
Long-term debt, total	496,900,000			496,900,000			0
Lear
Long-term Debt
Long-term debt, total	1,971,900,000			1,971,900,000			1,718,700,000
Less — Current portion	(15,600,000)			(15,600,000)			(243,700,000)
Long-term debt	1,956,300,000			1,956,300,000			1,475,000,000
Lear | Senior notes
Long-term Debt
Long-term debt, total	1,475,000,000			1,475,000,000			1,718,700,000
Lear | Credit Agreement — Term Loan Facility | Term Loan Facility
Long-term Debt
Long-term debt, total	$ 496,900,000			$ 496,900,000			$ 0
[1] Unaudited.

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