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Common Stock Repurchase Programs - Additional Information (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Aug. 31, 2018
Common Stock [Line Items]      
Common stock authorized for repurchase     $ 500.0
Company's Common stock repurchased   $ 107.2  
Restricted Stock [Member]      
Common Stock [Line Items]      
Number of shares withheld to satisfy minimum statutory tax withholding obligations 159,000    
Amount withheld to satisfy minimum statutory tax withholding obligations $ 3.0