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Share Repurchases - Additional information (Detail) - USD ($)
$ / shares in Units, shares in Thousands
 1 Months Ended 9 Months Ended
Nov. 02, 2016
Sep. 30, 2016
Oct. 31, 2016
Jul. 13, 2016
Apr. 30, 2015
Equity Class Of Treasury Stock [Line Items]          
Purchase of treasury stock (in shares)   9,930      
Purchase of treasury stock   $ 656,087,000      
Purchase of treasury stock, average price per share   $ 66.07      
Share repurchase program, authorized amount       $ 1,240,748,000 $ 259,252,000
Subsequent Event          
Equity Class Of Treasury Stock [Line Items]          
Purchase of treasury stock (in shares) 3,367        
Purchase of treasury stock $ 212,353,000        
Purchase of treasury stock, average price per share $ 63.07        
Share repurchase program, outstanding authorizations available for share repurchase     $ 881,040,000