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Shareholders' Equity Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                
Repurchase and retirement of common stock $ 200 $ 500 $ 48,800 $ 500 $ 400 $ 6,200 $ 49,500  
Repurchase and retirement of common stock (shares)             600,000  
Stock Repurchase Program, Number of Shares Authorized to be Repurchased 2,600,000           2,600,000  
Cash dividend paid during period, per share (in dollars per share) $ 0.62     $ 0.61     $ 1.86 $ 1.83
Common stock excluded from calculation of diluted earnings per share (shares) 2,200,000     4,300,000     5,000,000.0 4,200,000
Omnibus Incentive Plan                
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                
Common stock excluded from calculation of diluted earnings per share (shares)             700,000