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Common Stock Repurchase Programs - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Aug. 31, 2018
Common Stock [Line Items]            
Common stock authorized for repurchase           $ 500,000
Common stock repurchased $ 65,527 $ 78,982 $ 52,160 $ 144,500 $ 250,000  
Common Stock [Member]            
Common Stock [Line Items]            
Common stock repurchased $ 25 $ 25 $ 12      
Repurchased common stock, shares 2,508,000 2,525,000 1,155,000 5,000,000.0    
Restricted Stock [Member]            
Common Stock [Line Items]            
Number of shares withheld to satisfy minimum statutory tax withholding obligations       63,666    
Amount withheld to satisfy minimum statutory tax withholding obligations       $ 1,700