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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]                      
Net income (loss)                 $ 116,105 $ (243,132) $ 61,199
(Income) loss attributable to non-controlling interests, net                 (1,671) 1,447 (1,187)
Less: Preferred dividends                 (33,531) (28,759) (22,375)
Less: Earnings attributable to unvested shares and OP Units                 (1,137) (989) (786)
Net income (loss) attributable to common shareholders after allocation to participating securities                 $ 79,766 $ (271,433) $ 36,851
Denominators – Number of Shares                      
Basic – Average shares outstanding 184,266 184,655 184,634 184,560 184,160 183,843 183,493 183,215 184,528 183,681 182,647
Effect of dilutive securities – Stock options                 7 0 134
Diluted – Average shares outstanding 184,412 184,655 184,634 184,560 184,160 183,843 183,515 183,215 184,535 183,681 182,781
Earnings (Loss) Per Share:                      
Basic $ 0.94 $ (0.09) $ (0.07) $ (0.34) $ (1.23) $ (0.04) $ 0.13 $ (0.33) $ 0.43 $ (1.48) $ 0.20
Diluted $ 0.93 $ (0.09) $ (0.07) $ (0.34) $ (1.23) $ (0.04) $ 0.13 $ (0.33) $ 0.43 $ (1.48) $ 0.20