XML 86 R73.htm IDEA: XBRL DOCUMENT v3.6.0.2
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, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2015
Oct. 31, 2014
Common Stock [Line Items]                  
Repurchased common stock, shares         900,000 3,400,000      
Common stock repurchased         $ 61,828,000 $ 235,051,000 $ 488,429,000    
Common stock authorized for repurchase                 $ 600,000,000
Restricted Stock [Member]                  
Common Stock [Line Items]                  
Number of shares withheld to satisfy minimum statutory tax withholding obligations         46,490 18,282      
Amount withheld to satisfy minimum statutory tax withholding obligations         $ 3,200,000 $ 1,500,000      
Accelerated Share Repurchase (ASR) Agreements [Member]                  
Common Stock [Line Items]                  
Repurchased common stock, shares 2,200,000 2,500,000 300,000 300,000          
Common stock repurchased $ 200,000,000 $ 200,000,000              
Common stock purchase             $ 200,000,000 $ 200,000,000