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Subsequent Events - Additional Information (Detail) - $ / shares
3 Months Ended 12 Months Ended
Feb. 11, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subsequent Event [Line Items]                                
Cash dividend declared per common share (in dollars per share)   $ 0.29 $ 0.16 $ 0.16 $ 0.16 $ 0.29 $ 0.16 $ 0.14 $ 0.14 $ 0.27 $ 0.14 $ 0.14 $ 0.14 $ 0.77 $ 0.73 $ 0.69
Subsequent Event [Member]                                
Subsequent Event [Line Items]                                
Cash dividend declared per common share (in dollars per share) $ 0.16