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Capital Stock, Accumulated Other Comprehensive Loss and Equity - Additional Information (Detail) | 3 Months Ended | 12 Months Ended | 84 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 $ / shares | Jul. 01, 2017 $ / shares | Apr. 01, 2017 $ / shares | Oct. 01, 2016 $ / shares | Jul. 02, 2016 $ / shares | Apr. 02, 2016 $ / shares | Sep. 26, 2015 $ / shares | Jun. 27, 2015 $ / shares | Mar. 28, 2015 $ / shares | Dec. 31, 2017 USD ($) vote $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) vote $ / shares shares
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  |  |  |  |  |  |  |  |  | 300,000,000 | 300,000,000 |  | 300,000,000
Common stock holders voting right, vote per outstanding share | vote |  |  |  |  |  |  |  |  |  | 1 |  |  | 1
Common stock, aggregate authorized repurchase amount |  |  |  |  |  |  |  |  |  | $ 4,100,000,000.0 |  |  | $ 4,100,000,000.0
Repurchase of common stock |  |  |  |  |  |  |  |  |  | $ 450,500,000 | $ 658,800,000 | $ 487,400,000 | $ 3,500,000,000
Repurchase of common stock, average price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 150.77 | $ 113.26 | $ 111.62 | $ 79.73
Stock repurchased during period, amount |  |  |  |  |  |  |  |  |  | $ 454,400,000 | $ 658,800,000 | $ 487,400,000 |
Repurchase of common stock (in shares) | shares |  |  |  |  |  |  |  |  |  | 3,014,131 | 5,816,363 | 4,366,365 |
Remaining repurchase authorization |  |  |  |  |  |  |  |  |  | $ 545,600,000 |  |  | $ 545,600,000
Retirement of shares held in treasury (in shares) | shares |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |
Cash dividends declared (in dollars per share) | $ / shares | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.50 | $ 0.30 | $ 0.25 |
Dividends declared to Lear Corporation stockholders |  |  |  |  |  |  |  |  |  | $ 140,300,000 | $ 89,100,000 | $ 79,400,000 |
Dividends paid to Lear Corporation stockholders |  |  |  |  |  |  |  |  |  | 137,700,000 | 88,800,000 | 78,500,000 |
Pretax income (loss) related to intercompany transactions for which settlement is not planned or anticipated in the foreseeable future |  |  |  |  |  |  |  |  |  | 900,000 | (200,000) | (10,700,000) |
Purchase of remaining noncontrolling interest |  |  |  |  |  |  |  |  |  | $ 32,600,000 |  |  |
Percentage ownership of affiliate after transaction |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (reduction) for retirement of shares held in treasury |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |
Additional paid-in capital |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period, amount |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Increase (reduction) for retirement of shares held in treasury |  |  |  |  |  |  |  |  |  | 155,900,000 |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (reduction) for retirement of shares held in treasury |  |  |  |  |  |  |  |  |  | 735,500,000 |  |  |
Dividends declared to Lear Corporation stockholders |  |  |  |  |  |  |  |  |  | 140,300,000 | 89,100,000 | 79,400,000 |
Treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period, amount |  |  |  |  |  |  |  |  |  | 454,400,000 | $ 658,800,000 | $ 487,400,000 |
Increase (reduction) for retirement of shares held in treasury |  |  |  |  |  |  |  |  |  | $ (891,500,000) |  |  |

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