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Share Repurchases - Additional information (Detail) - USD ($)
$ / shares in Units, shares in Thousands
6 Months Ended
Jun. 30, 2016
Aug. 08, 2016
Jul. 13, 2016
Apr. 30, 2015
Equity Class Of Treasury Stock [Line Items]        
Purchase of treasury stock (in shares) 3,690      
Purchase of treasury stock $ 249,481,000      
Purchase of treasury stock, average price per share $ 67.61      
Share repurchase program, authorized amount       $ 259,252,000
Subsequent Event        
Equity Class Of Treasury Stock [Line Items]        
Share repurchase program, authorized amount     $ 1,240,748,000  
Share repurchase program, outstanding authorizations available for share repurchase   $ 1,500,000,000