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Summary of Information Used to Compute Diluted Net Income Per Share (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
Sep. 29, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Lear $ 112.8 $ 121.4 $ 358.6 $ 400.9
Average common shares outstanding 80,674,338 97,482,353 86,609,304 98,975,335
Dilutive effect of common stock equivalents 1,079,825 1,382,520 1,041,134 1,493,131
Average diluted shares outstanding 81,754,163 98,864,873 87,650,438 100,468,466
Basic net income per share attributable to Lear $ 1.40 $ 1.25 $ 4.14 $ 4.05
Diluted net income per share attributable to Lear $ 1.38 $ 1.23 $ 4.09 $ 3.99