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Earnings Per Share - Reconciliation of Net Income (Loss) and Number of Common Shares Used in Computations of "Basic" EPS and "Diluted" EPS (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
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, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]                      
Net income (loss)                 $ 101,825 $ 116,105 $ (243,132)
Plus: (Income) loss attributable to non-controlling interests                 (1,126) (1,671) 1,447
Less: Write-off of preferred share original issuance costs                 (7,176) 0 0
Less: Preferred dividends                 (32,231) (33,531) (28,759)
Less: Earnings attributable to unvested shares and OP Units                 (687) (1,137) (989)
Net income (loss) attributable to common shareholders after allocation to participating securities                 $ 60,605 $ 79,766 $ (271,433)
Denominators – Number of Shares                      
Basic – Average shares outstanding 190,360 180,567 180,551 180,546 184,266 184,655 184,634 184,560 183,026 184,528 183,681
Assumed conversion of dilutive securities                 228 7 0
Diluted – Average shares outstanding 190,522 181,507 181,209 181,091 184,412 184,655 184,634 184,560 183,254 184,535 183,681
Earnings (Loss) Per Share:                      
Basic $ 0.05 $ 0.08 $ 0.05 $ 0.15 $ 0.94 $ (0.09) $ (0.07) $ (0.34) $ 0.33 $ 0.43 $ (1.48)
Diluted $ 0.05 $ 0.08 $ 0.05 $ 0.15 $ 0.93 $ (0.09) $ (0.07) $ (0.34) $ 0.33 $ 0.43 $ (1.48)