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Summary of Information Used to Compute Basic Net Income Per Share (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Dec. 31, 2012 | Sep. 29, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Lear | $ 72.8 | $ 112.8 | $ 137.3 | $ 108.5 | $ 881.9 | $ 121.4 | $ 145.4 | $ 134.1 | $ 431.4 | $ 1,282.8 | $ 540.7
Average common shares outstanding |  |  |  |  |  |  |  |  | 85,094,889 | 98,388,228 | 103,750,223
Basic net income per share attributable to Lear | $ 0.90 | $ 1.40 | $ 1.62 | $ 1.14 | $ 9.12 | $ 1.25 | $ 1.47 | $ 1.34 | $ 5.07 | $ 13.04 | $ 5.21

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