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Capital Stock and Equity - Additional Information (Detail) | 3 Months Ended | 12 Months Ended | 60 Months Ended |  |
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Sep. 26, 2015 $ / shares | Jun. 27, 2015 $ / shares | Mar. 28, 2015 $ / shares | Dec. 31, 2014 $ / shares shares | Sep. 27, 2014 $ / shares | Jun. 28, 2014 USD ($) $ / shares | Mar. 29, 2014 $ / shares | Dec. 31, 2013 $ / shares | Sep. 28, 2013 $ / shares | Jun. 29, 2013 USD ($) $ / shares shares | Mar. 30, 2013 $ / shares | Dec. 31, 2012 $ / shares | Dec. 31, 2015 USD ($) Vote $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) Vote $ / shares shares | Mar. 31, 2014 shares | Apr. 25, 2013 USD ($)
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,900,000,000.0 |  |  | $ 2,900,000,000.0 |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 487,400,000 | $ 411,400,000 | $ 1,000,100,000 | $ 2,400,000,000 |  |
Repurchase of common stock, average price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 111.62 | $ 93.52 | $ 54.08 | $ 68.12 |  |
Repurchase of common stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 4,366,365 | 3,805,114 | 15,533,758 |  |  |
Percentage of treasury stock repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |
Remaining repurchase authorization |  |  |  |  |  |  |  |  |  |  |  |  | $ 512,600,000 |  |  | $ 512,600,000 |  |
Retirement of shares held in treasury (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 | 20,000,000 |  |  |
Increase (reduction) in shares held in treasury |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |
Cash dividends declared (in dollars per share) | $ / shares | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.17 | $ 0.17 | $ 0.17 | $ 0.17 |  |  |  |  |  |
Dividends declared to Lear Corporation stockholders |  |  |  |  |  |  |  |  |  |  |  |  | 79,400,000 | 67,100,000 | 59,400,000 |  |  |
Dividends paid to Lear Corporation stockholders |  |  |  |  |  |  |  |  |  |  |  |  | 78,500,000 | 65,300,000 | 58,400,000 |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (reduction) in shares held in treasury |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 200,000 |  |  |
Additional paid-in capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (reduction) in shares held in treasury |  |  |  |  |  |  |  |  |  |  |  |  |  | 155,900,000 | 389,700,000 |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (reduction) in shares held in treasury |  |  |  |  |  |  |  |  |  |  |  |  |  | 363,900,000 | 600,700,000 |  |  |
Dividends declared to Lear Corporation stockholders |  |  |  |  |  |  |  |  |  |  |  |  | 79,400,000 | 67,100,000 | 59,400,000 |  |  |
Treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (reduction) in shares held in treasury |  |  |  |  |  |  |  |  |  |  |  |  |  | (519,900,000) | $ (990,600,000) |  |  |
Open market repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 355,900,000 |  |  |  |
ASR agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, aggregate authorized repurchase amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000,000
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 55,500,000 |  |  |  |
Amount paid in accelerated stock repurchase agreement |  |  |  |  |  | $ 55,500,000 |  |  |  | $ 800,000,000 |  |  | $ 855,500,000 |  |  | $ 855,500,000 |  |
Repurchase of common stock (in shares) | shares |  |  |  |  |  |  |  |  |  | 11,862,836 |  |  |  |  |  |  |  |
Percentage of treasury stock repurchased |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |
Value of common stock repurchased (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 53.95 |  |  |  |  |  |  |  |
Excess shares delivered under ASR (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 658,903 |
Final price paid per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 72.11 |  |  |  |  |

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