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Equity - Common Share Dividend Declared (Detail) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Equity [Abstract]        
Common share dividends declared per share $ 0.12 $ 0 $ 0.35 $ 0.20