XML 15 R37.htm IDEA: XBRL DOCUMENT v3.3.0.814
Common Stock Repurchase Programs - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 23, 2015
Mar. 16, 2015
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Mar. 31, 2015
Oct. 31, 2014
Common Stock [Line Items]              
Repurchases of common stock       $ 235,051,000 $ 127,759,000    
Common stock authorized for repurchase             $ 600,000,000
Common stock shares issued       3,000,000      
Common stock paid       $ 235,100,000      
Common stock purchase           $ 200,000,000  
Accelerated Share Repurchase (ASR) Agreements [Member]              
Common Stock [Line Items]              
Common stock shares issued   2,200,000 300,000        
Common stock paid   $ 200,000,000          
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        
Accelerated Share Repurchase Programs and Open Market Purchases [Member]              
Common Stock [Line Items]              
Repurchases of common stock       $ 0      
Subsequent Event [Member] | Accelerated Share Repurchase (ASR) Agreements [Member]              
Common Stock [Line Items]              
Common stock shares issued 300,000