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Common Stock Repurchase Programs - Additional Information (Detail) - USD ($)
shares in Millions
 6 Months Ended
Mar. 16, 2015
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
Oct. 31, 2014
Common Stock [Line Items]          
Repurchases of common stock   $ 233,601,000 $ 126,696,000    
Common stock authorized for repurchase         $ 600,000,000
Common stock shares issued   2.7      
Common stock paid   $ 233,600,000      
Common stock purchase       $ 200,000,000  
Accelerated Share Repurchase (ASR) Agreements [Member]          
Common Stock [Line Items]          
Common stock shares issued 2.2        
Common stock paid $ 200,000,000        
Accelerated Share Repurchase Programs and Open Market Purchases [Member]          
Common Stock [Line Items]          
Repurchases of common stock   $ 0