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Stockholders' Equity - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Oct. 26, 2020
Jul. 25, 2011
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Stockholders Equity [Line Items]                    
Common stock, value of shares authorized to repurchase   $ 200,000,000                
Stock repurchase, shares   2,588,000 0     0     0 0
Value of shares repurchased   $ 127,000,000                
Cash dividends per common share     $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.60 $ 0.60
Dividend payment to common shareholders                 $ 33,000,000.0 $ 32,600,000
Subsequent Event [Member]                    
Stockholders Equity [Line Items]                    
Dividend declared date Oct. 26, 2020                  
Cash dividend to be paid $ 0.20                  
Dividend to be paid date Dec. 04, 2020                  
Dividend declared, shareholders of record date Nov. 23, 2020