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Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) - $ / shares | Oct. 06, 2021 | Sep. 30, 2021 | Sep. 03, 2021 | Aug. 31, 2021 | Aug. 06, 2021 | Jul. 30, 2021 | Jul. 13, 2021
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Series E Preferred Stock | Subsequent Event |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Distribution per share (in dollars per share) |  |  |  |  |  | $ 0.138021 | $ 0.414063
Series G Preferred Stock | Subsequent Event |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Distribution per share (in dollars per share) |  |  |  |  |  | 0.125 | 0.375
Senior Common Stock | Subsequent Event |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Distribution per share (in dollars per share) |  |  |  |  | $ 0.0875 |  | 0.2625
Series F Preferred Stock | Subsequent Event |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Distribution per share (in dollars per share) |  |  |  |  | $ 0.125 |  | 0.375
Common Stock | Subsequent Event |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Distribution per share (in dollars per share) |  |  |  |  |  | $ 0.12515 | $ 0.37545
Forecast | Series E Preferred Stock |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Distribution per share (in dollars per share) |  | $ 0.138021 |  | $ 0.138021 |  |  |
Forecast | Series G Preferred Stock |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Distribution per share (in dollars per share) |  | 0.125 |  | 0.125 |  |  |
Forecast | Senior Common Stock |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Distribution per share (in dollars per share) | $ 0.0875 |  | $ 0.0875 |  |  |  |
Forecast | Series F Preferred Stock |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Distribution per share (in dollars per share) | $ 0.125 |  | $ 0.125 |  |  |  |
Forecast | Common Stock |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Distribution per share (in dollars per share) |  | $ 0.12515 |  | $ 0.12515 |  |  |

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