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Financial Instruments - Additional Information (Detail) € in Millions		12 Months Ended
	Sep. 08, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 21, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Uncommitted factoring agreement, aggregate purchase of customer accounts | €			€ 200
Factored receivables outstanding		$ 0		$ 0
Expected amount to be reclassified into earnings from accumulated other comprehensive loss		11,500,000
Tax (benefits) expense related to derivative instruments and hedging activities recognized in other comprehensive income (loss)		(15,900,000)		3,900,000	$ 3,500,000
Shanghai Lear STEC Automotive Parts Co., Ltd. (China)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Noncontrolling interests, fair value	$ 125,000,000
Fair value of previously held equity interest in acquiree	$ 94,000,000	94,000,000
Beijing BAI Lear Automotive Systems Co., Ltd.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Noncontrolling interests, fair value						$ 41,000,000
Fair value of previously held equity interest in acquiree				63,000,000
Designated as hedging instrument | Foreign exchange contract | Derivative instruments and hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pretax net losses related to derivative instruments and hedging activities in accumulated other comprehensive loss		18,200,000		56,500,000
Level 3 | Antolin Seating
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, plant and equipment, fair value		95,400,000
Intangible assets, fair value		187,400,000
Noncontrolling interests, fair value		125,000,000
Level 3 | AccuMed and Beijing BAI Lear Automotive Systems Co., Ltd.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, plant and equipment, fair value				31,200,000
Intangible assets, fair value				87,000,000
Noncontrolling interests, fair value				41,000,000
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable equity securities		43,800,000		30,200,000
Fair value, measurements, recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable equity securities		43,800,000		30,200,000
Fair value, measurements, recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable equity securities		$ 0		$ 0

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Amount of investments in equity securities and other forms of securities that provide ownership interests expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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