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Financial Instruments - Additional Information (Detail)		3 Months Ended	9 Months Ended
	Jun. 21, 2016 USD ($)	Oct. 01, 2016 USD ($)	Oct. 01, 2016 USD ($)	Oct. 01, 2016 EUR (€)	Dec. 31, 2015 USD ($)
Financial Instruments [Line Items]
Uncommitted factoring agreement, aggregate purchases of specified customer accounts (up to) | €				€ 200,000,000
Factored receivables outstanding		$ 0	$ 0
Gain (loss) expected to be reclassified into earnings from accumulated other comprehensive loss			(51,400,000)
Derivative contracts classified within Level 3 of fair value hierarchy		0	0		$ 0
Derivative contracts transfers in to Level 3 fair value hierarchy			0
Consolidation of affiliate		1,000,000	41,000,000
Beijing BAI Lear Automotive Systems Co., Ltd.
Financial Instruments [Line Items]
Consolidation of affiliate	$ 41,000,000
Fair value of previously held equity interest in acquiree	$ 63,000,000
Recurring | Equity contract
Financial Instruments [Line Items]
Marketable equity securities		28,800,000	28,800,000		23,000,000
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Foreign exchange contract | Designated as hedging instrument
Financial Instruments [Line Items]
Pretax gains (losses) related to derivative instruments and hedging activities in accumulated other comprehensive loss		(60,700,000)	(60,700,000)		(46,400,000)
Level 3 | Beijing BAI Lear Automotive Systems Co., Ltd.
Financial Instruments [Line Items]
Property, plant and equipment, fair value		20,700,000	20,700,000
Intangible assets, fair value		34,000,000	34,000,000
Noncontrolling interests, fair value		41,000,000	41,000,000
Level 3 | Eagle Ottawa
Financial Instruments [Line Items]
Property, plant and equipment, fair value					142,400,000
Intangible assets, fair value					211,300,000
Contingent consideration					25,000,000
Level 3 | Recurring | Equity contract
Financial Instruments [Line Items]
Marketable equity securities		$ 0	$ 0		$ 0

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Financial Instruments [Line Items]

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Intangible Assets (Excluding Goodwill), Fair Value Disclosure

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Uncommitted Factoring Agreement, Aggregate Purchase of Customer Accounts

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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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Amount of liability recognized arising from contingent consideration in a business combination.

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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 transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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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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Amount of increase in noncontrolling interest from a business combination.

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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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