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Investments in Affiliates and Other Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 | Sep. 30, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |  |  |  |
Redeemable noncontrolling interest |  |  |  | $ 153.4 | $ 158.1 | $ 153.4
Noncontrolling interest, change in redemption value |  |  |  |  | (10.4) | (25.5)
Lear FAWSN |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Equity interest acquired | 20.00% |  |  |  |  |
Intangible assets acquired, weighted average useful life | 10 years |  |  |  |  |
Fair value of previously held equity interest in acquiree | $ 23.0 |  |  |  | 23.0 |
Noncontrolling interests, fair value | 14.0 |  |  |  |  |
Consolidation of affiliate, revaluation gain | 10.0 |  | $ 10.0 |  |  |
Annual sales | $ 100.0 |  |  |  |  |
Lear STEC |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Intangible assets acquired, weighted average useful life |  | 12 years |  |  |  |
Fair value of previously held equity interest in acquiree |  | $ 94.0 |  |  | 94.0 |
Noncontrolling interests, fair value |  | 125.0 |  |  |  |
Consolidation of affiliate, revaluation gain |  | 54.2 |  | 54.2 |  |
Annual sales |  | $ 280.0 |  |  |  |
Redeemable noncontrolling interest |  |  |  | $ 153.4 | 158.1 | 153.4
Noncontrolling interest, change in redemption value |  |  |  |  | $ 10.4 | $ 25.5
Lear STEC | Lear STEC |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  | 45.00% |  |  |  |

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