Financial Instruments - Additional Information (Detail) € in Millions		12 Months Ended
	Jun. 21, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 EUR (€)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
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		47,100,000
Tax (benefits) expense related to derivative instruments and hedging activities recognized in other comprehensive income (loss)		(3,900,000)		(3,500,000)	$ (14,800,000)
Beijing BAI Lear Automotive Systems Co., Ltd.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of previously held equity interest in acquiree	$ 63,000,000
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		34,600,000
Intangible assets, fair value		87,000,000
Noncontrolling interests, fair value		41,000,000
Level 3 | Eagle Ottawa
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, plant and equipment, fair value				142,400,000
Intangible assets, fair value				211,300,000
Contingent consideration				25,000,000
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 gains (losses) related to derivative instruments and hedging activities in accumulated other comprehensive loss		(56,500,000)		(46,400,000)
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable equity securities		30,200,000		23,000,000
Fair value, measurements, recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable equity securities		30,200,000		23,000,000
Fair value, measurements, recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable equity securities		$ 0		$ 0