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Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) - $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended |
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Apr. 05, 2021 | Mar. 31, 2021 | Mar. 24, 2021 | Mar. 18, 2021 | Mar. 05, 2021 | Feb. 26, 2021 | Feb. 24, 2021 | Feb. 17, 2021 | Feb. 05, 2021 | Jan. 29, 2021 | Jan. 27, 2021 | Jan. 22, 2021 | Mar. 31, 2021 | Feb. 28, 2021 | Jan. 31, 2021 | Jan. 12, 2021
Subsequent Event | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.4374999
Subsequent Event | Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.414063
Subsequent Event | Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.375
Subsequent Event | Senior Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.2625
Subsequent Event | Common Stock and Non-controlling OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.37545
Subsequent Event | Dividend Declared for Month of January |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record date |  |  |  |  |  |  |  |  |  |  |  | Jan. 22, 2021 |  |  |  |
Payment date |  |  |  |  |  |  |  |  |  | Jan. 29, 2021 |  |  |  |  |  |
Subsequent Event | Dividend Declared for Month of January | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.1458333 |  |  |  |  |  |
Subsequent Event | Dividend Declared for Month of January | Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  |  |  |  |  | 0.138021 |  |  |  |  |  |
Subsequent Event | Dividend Declared for Month of January | Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment date |  |  |  |  |  |  |  |  | Feb. 05, 2021 |  |  |  |  |  |  |
Month in which distribution is payable to holders of record |  |  |  |  |  |  |  |  |  |  | January 27, 2021 |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.125 |  |  |  |  |  |  |
Subsequent Event | Dividend Declared for Month of January | Senior Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment date |  |  |  |  |  |  |  |  | Feb. 05, 2021 |  |  |  |  |  |  |
Month in which distribution is payable to holders of record |  |  |  |  |  |  |  |  |  |  |  |  |  |  | January |
Distributions (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.0875 |  |  |  |  |  |  |
Subsequent Event | Dividend Declared for Month of January | Common Stock and Non-controlling OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.12515 |  |  |  |  |  |
Scenario, Forecast | Dividend Declared for Month of February |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record date |  |  |  |  |  |  |  | Feb. 17, 2021 |  |  |  |  |  |  |  |
Payment date |  |  |  |  |  | Feb. 26, 2021 |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Dividend Declared for Month of February | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  | $ 0.1458333 |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Dividend Declared for Month of February | Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  | 0.138021 |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Dividend Declared for Month of February | Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment date |  |  |  |  | Mar. 05, 2021 |  |  |  |  |  |  |  |  |  |  |
Month in which distribution is payable to holders of record |  |  |  |  |  |  | February 24, 2021 |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  | $ 0.125 |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Dividend Declared for Month of February | Senior Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment date |  |  |  |  | Mar. 05, 2021 |  |  |  |  |  |  |  |  |  |  |
Month in which distribution is payable to holders of record |  |  |  |  |  |  |  |  |  |  |  |  |  | February |  |
Distributions (in dollars per share) |  |  |  |  | $ 0.0875 |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Dividend Declared for Month of February | Common Stock and Non-controlling OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  | $ 0.12515 |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Dividend Declared for Month of March |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record date |  |  |  | Mar. 18, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Payment date |  | Mar. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Dividend Declared for Month of March | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  | $ 0.1458333 |  |  |  |  |  |  |  |  |  |  | $ 0.1458333 |  |  |
Scenario, Forecast | Dividend Declared for Month of March | Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  | 0.138021 |  |  |  |  |  |  |  |  |  |  | $ 0.138021 |  |  |
Scenario, Forecast | Dividend Declared for Month of March | Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment date | Apr. 05, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Month in which distribution is payable to holders of record |  |  | March 24, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) | $ 0.125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Dividend Declared for Month of March | Senior Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment date | Apr. 05, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Month in which distribution is payable to holders of record |  |  |  |  |  |  |  |  |  |  |  |  | March |  |  |
Distributions (in dollars per share) | $ 0.0875 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Dividend Declared for Month of March | Common Stock and Non-controlling OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  | $ 0.12515 |  |  |  |  |  |  |  |  |  |  | $ 0.12515 |  |  |

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