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Subsequent Events (Detail) - $ / shares
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 14, 2021
Feb. 09, 2021
Feb. 07, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Subsequent Event [Line Items]                  
Quarterly dividend declared (in usd per share)   $ 0.1075 $ 0.0975 $ 0.1075 $ 0.0975 $ 0.3225 $ 0.2925 $ 0.0975 $ 0.085
Fourth Quarter Dividend | Subsequent Event                  
Subsequent Event [Line Items]                  
Quarterly dividend declared (in usd per share) $ 0.1075