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Capital Stock, Equity and Accumulated Other Comprehensive Loss - Additional Information (Detail)
 3 Months Ended 12 Months Ended 72 Months Ended
Dec. 31, 2016
USD ($)
Vote
$ / shares
shares
Oct. 01, 2016
$ / shares
Jul. 02, 2016
$ / shares
Apr. 02, 2016
$ / shares
Dec. 31, 2015
$ / shares
shares
Sep. 26, 2015
$ / shares
Jun. 27, 2015
$ / shares
Mar. 28, 2015
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Sep. 27, 2014
$ / shares
Jun. 28, 2014
$ / shares
Mar. 29, 2014
$ / shares
Dec. 31, 2016
USD ($)
Vote
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
Vote
$ / shares
shares
Equity, Class of Treasury Stock [Line Items]                                
Common stock, shares authorized (in shares) | shares 300,000,000       300,000,000               300,000,000 300,000,000   300,000,000
Common stock holders voting right, vote per outstanding share | Vote 1                       1     1
Common stock, aggregate authorized repurchase amount $ 3,400,000,000.0                       $ 3,400,000,000.0     $ 3,400,000,000.0
Repurchase of common stock                         $ 658,800,000 $ 487,400,000 $ 411,400,000 $ 3,100,000,000
Repurchase of common stock, average price (in dollars per share) | $ / shares                         $ 113.26 $ 111.62 $ 93.52 $ 74.51
Repurchase of common stock (in shares) | shares                         5,816,363 4,366,365 3,805,114  
Remaining repurchase authorization $ 341,200,000                       $ 341,200,000     $ 341,200,000
Retirement of shares held in treasury (in shares) | shares                             8,000,000  
Increase (reduction) for retirement of shares held in treasury                             $ 0  
Cash dividends declared (in dollars per share) | $ / shares $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 0.20 $ 0.20 $ 0.20 $ 0.20        
Dividends declared to Lear Corporation stockholders                         89,100,000 $ 79,400,000 67,100,000  
Dividends paid to Lear Corporation stockholders                         88,800,000 78,500,000 65,300,000  
Pretax income (loss) related to intercompany transactions for which settlement is not planned or anticipated in the foreseeable future                         (200,000) (10,700,000) (18,700,000)  
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]                                
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                             363,900,000  
Dividends declared to Lear Corporation stockholders                         $ 89,100,000 $ 79,400,000 67,100,000  
Treasury stock                                
Equity, Class of Treasury Stock [Line Items]                                
Increase (reduction) for retirement of shares held in treasury                             (519,900,000)  
Open market                                
Equity, Class of Treasury Stock [Line Items]                                
Repurchase of common stock                             355,900,000  
ASR agreement                                
Equity, Class of Treasury Stock [Line Items]                                
Amount paid in accelerated stock repurchase agreement                 $ 55,500,000           $ 55,500,000