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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)