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Investments in Affiliates and Other Related Party Transactions - Beneficial Ownership in Affiliates Accounted for under Equity Method (Detail) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Beijing BHAP Lear Automotive Systems Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 50.00% | 50.00% | 50.00%
Dong Kwang Lear Yuhan Hoesa (Korea) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 50.00% | 50.00% | 50.00%
Jiangxi Jiangling Lear Interior Systems Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 50.00% | 50.00% | 50.00%
Lear Dongfeng Automotive Seating Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 50.00% | 50.00% | 50.00%
Industrias Cousin Freres, S.L. (Spain) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 50.00% | 50.00% | 50.00%
Changchun Lear FAWSN Automotive Electrical and Electronics Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 49.00% | 49.00% | 49.00%
Changchun Lear FAWSN Automotive Seat Systems Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 49.00% | 49.00% | 49.00%
Honduras Electrical Distribution Systems S. de R.L. de C.V. (Honduras) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 49.00% | 49.00% | 49.00%
Kyungshin-Lear Sales and Engineering LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 49.00% | 49.00% | 49.00%
eLumigen, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 46.00% | 46.00% | 30.00%
Beijing Lear Dymos Automotive Systems Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 40.00% | 40.00% | 40.00%
Dymos Lear Automotive India Private Limited (India) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 35.00% | 35.00% | 35.00%
RevoLaze, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 20.00% | 20.00% | 20.00%
HB Polymer Company, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 10.00% | 10.00% | 10.00%
Shanghai Lear STEC Automotive Parts Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 0.00% | 55.00% | 55.00%
Beijing BAI Lear Automotive Systems Co., Ltd. (China) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage of affiliates | 0.00% | 0.00% | 50.00%

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