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Common Stock Repurchase Programs - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Mar. 16, 2015
Dec. 17, 2014
Oct. 31, 2015
Jul. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2015
Oct. 31, 2014
Common Stock [Line Items]                  
Common stock authorized for repurchase                 $ 600,000,000
Common stock purchase           $ 200,000,000   $ 200,000,000  
Common stock repurchased         $ 235,051,000 $ 488,429,000 $ 51,863,000    
Common stock shares issued         3,400,000        
Number of shares withheld to satisfy minimum statutory tax withholding obligations         710,702        
Accelerated Share Repurchase (ASR) Agreements [Member]                  
Common Stock [Line Items]                  
Common stock repurchased $ 200,000,000 $ 200,000,000              
Common stock shares issued 2,200,000 2,500,000 300,000 300,000          
Amount withheld to satisfy minimum statutory tax withholding obligations         $ 1,500,000        
Accelerated Share Repurchase (ASR) Agreements [Member] | Restricted Stock Units (RSUs) [Member]                  
Common Stock [Line Items]                  
Number of shares withheld to satisfy minimum statutory tax withholding obligations         18,282