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Common Stock Repurchase Programs - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 04, 2018
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Aug. 31, 2018
Common Stock [Line Items]              
Common stock authorized for repurchase             $ 500,000,000
Common stock repurchased       $ 302,160,000 $ 70,192,000 $ 61,828,000  
Common Stock [Member]              
Common Stock [Line Items]              
Common stock repurchased       $ 70,000 $ 10,000 $ 9,000  
Repurchased common stock, shares       7,041,000 1,038,000 946,000  
Restricted Stock [Member]              
Common Stock [Line Items]              
Number of shares withheld to satisfy minimum statutory tax withholding obligations     54,909   38,257    
Amount withheld to satisfy minimum statutory tax withholding obligations     $ 2,500,000   $ 2,100,000    
Accelerated Share Repurchase (ASR) Agreements [Member]              
Common Stock [Line Items]              
Common stock purchase             $ 250,000,000
Common stock repurchased $ 250,000,000            
Repurchased common stock, shares 4,200,000 1,700,000