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Shareholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Dec. 12, 2018
Jun. 30, 2019
May 01, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Accelerated Share Repurchases [Line Items]            
Fair value of common stock repurchased   $ 497,572     $ 477,572  
Common Stock, Shares, Outstanding         279,583,006 281,455,959
Common Stock, Shares Authorized         560,000,000 560,000,000
Common Stock, Par or Stated Value Per Share         $ 0.10 $ 0.10
Second Accelerated Share Repurchase Agreement [Member]            
Accelerated Share Repurchases [Line Items]            
Shares repurchased, authorized amount         $ 100,000  
Accelerated Share Repurchase Agreement [Member]            
Accelerated Share Repurchases [Line Items]            
Fair value of common stock repurchased         $ 80,000  
Treasury Stock, Shares, Acquired 2,910,150 566,599        
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 500,000        
Third Accelerated Share Repurchase Agreement [Member]            
Accelerated Share Repurchases [Line Items]            
Shares repurchased, authorized amount     $ 372,500      
Repurchase Agreements [Member]            
Accelerated Share Repurchases [Line Items]            
Shares repurchased, authorized amount       $ 100,000