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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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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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