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Capital Stock and Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended | 36 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended
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Apr. 25, 2013 | Jan. 31, 2013 | Dec. 31, 2013 Director Vote | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Dec. 31, 2012 | Sep. 29, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 Director Vote | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Director Vote | Feb. 07, 2014 Subsequent Event Dividend Declared | Dec. 31, 2013 Additional Paid-in Capital | Jun. 29, 2013 Additional Paid-in Capital | Dec. 31, 2013 Common Stock | Dec. 31, 2013 Retained Earnings | Dec. 31, 2013 Treasury Stock | Jan. 31, 2013 Additional Authorization | Feb. 28, 2013 2013 Share Repurchase Program | Apr. 30, 2013 Two-Year Stock Repurchase Program
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 300,000,000 |  |  |  | 300,000,000 |  |  |  | 300,000,000 | 300,000,000 |  | 300,000,000 |  |  |  |  |  |  |  |  |
Common stock holders voting right, vote per outstanding share |  |  | 1 |  |  |  |  |  |  |  | 1 |  |  | 1 |  |  |  |  |  |  |  |  |
Common Stock Share Repurchase Program, description |  | Common Stock Share Repurchase Program In January 2013, the Company's Board of Directors authorized an increase of $800 million to the Company's existing common stock share repurchase program, which permits the discretionary repurchase of the Company's common stock, to provide for aggregate repurchases of $1.5 billion and extended the term of the program to January 10, 2016. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, aggregate authorized repurchase amount |  | $ 1,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800 | $ 600 | $ 750
Number of directors |  |  | 3 |  |  |  |  |  |  |  | 3 |  |  | 3 |  |  |  |  |  |  |  |  |
Accelerated stock repurchase agreement amount | 800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid in accelerated stock repurchase agreement |  |  |  |  | 800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, repurchased |  |  |  |  | 11,862,836 |  |  |  |  |  | 15,533,758 | 5,357,443 | 6,182,429 |  |  |  |  |  |  |  |  |  |
Percentage of treasury stock repurchased |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |
Value of common stock repurchased, per share |  |  |  |  | $ 53.95 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of common stock repurchased |  |  |  |  |  |  |  |  |  |  | 1,000.1 | 222.8 | 279.1 | 1,500.0 |  |  | 160.0 |  |  |  |  |  |
Common stock, share repurchase program amount |  |  |  |  |  |  |  |  |  |  | 750 |  |  |  |  |  |  |  |  |  |  |  |
Common stock, at an average purchase price excluding commission |  |  |  |  |  |  |  |  |  |  | $ 54.08 | $ 41.59 | $ 45.15 |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  | 1,000.1 | 222.8 | 279.1 |  |  |  |  |  |  |  |  |  |
Shares held in treasury authorized to be retired |  |  | 20,000,000 |  |  |  |  |  |  |  | 20,000,000 |  |  | 20,000,000 |  |  |  |  |  |  |  |  |
Retirement of shares held in treasury |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 389.7 |  | 0.2 | 600.7 | 990.6 |  |  |
Dividends payable, per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.20 |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 07, 2014 |  |  |  |  |  |  |  |
Dividend payable date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 20, 2014 |  |  |  |  |  |  |  |
Dividend record date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 28, 2014 |  |  |  |  |  |  |  |
Cash dividends declared per share |  |  | $ 0.17 | $ 0.17 | $ 0.17 | $ 0.17 | $ 0.14 | $ 0.14 | $ 0.14 | $ 0.14 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared to Lear Corporation stockholders |  |  |  |  |  |  |  |  |  |  | 59.4 | 56.1 | 52.9 |  |  |  |  |  |  |  |  |  |
Dividends paid to Lear Corporation stockholders |  |  |  |  |  |  |  |  |  |  | $ 58.4 | $ 54.6 | $ 51.1 |  |  |  |  |  |  |  |  |  |
Warrants outstanding |  |  | 279,094 |  |  |  | 377,091 |  |  |  | 279,094 | 377,091 |  | 279,094 |  |  |  |  |  |  |  |  |
Exercisable of warrants into common stock |  |  | 558,188 |  |  |  | 754,182 |  |  |  | 558,188 | 754,182 |  | 558,188 |  |  |  |  |  |  |  |  |
Exercise price of Warrants |  |  | 0.005 |  |  |  |  |  |  |  | 0.005 |  |  | 0.005 |  |  |  |  |  |  |  |  |
Warrant expiration date |  |  | Nov. 09, 2014 |  |  |  |  |  |  |  | Nov. 09, 2014 |  |  | Nov. 09, 2014 |  |  |  |  |  |  |  |  |

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