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Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Oct. 30, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 02, 2019
Subsequent Event [Line Items]                
Dividend payments   $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09  
Subsequent Event [Member]                
Subsequent Event [Line Items]                
Dividend declaration date Oct. 30, 2019              
Dividend payments $ 0.09              
Dividend record date Nov. 14, 2019              
Dividend payment date Dec. 02, 2019              
Scenario Forecast [Member]                
Subsequent Event [Line Items]                
Quarterly dividend payable, aggregate amount subsequent to balance sheet date               $ 4.3