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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. 08, 2019 | Mar. 29, 2019 | Mar. 20, 2019 | Mar. 07, 2019 | Feb. 28, 2019 | Feb. 20, 2019 | Feb. 07, 2019 | Jan. 31, 2019 | Jan. 18, 2019 | Mar. 31, 2019 | Feb. 28, 2019 | Jan. 31, 2019 | Jan. 08, 2019
Subsequent event | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.4843749
Subsequent event | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 0.46875
Subsequent event | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 0.4374999
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) |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.375
Subsequent event | Dividend Declared for Month of January |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Record date |  |  |  |  |  |  |  |  | Jan. 18, 2019 |  |  |  |
Payment date |  |  |  |  |  |  |  | Jan. 31, 2019 |  |  |  |  |
Subsequent event | Dividend Declared for Month of January | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  |  |  | $ 0.1614583 |  |  |  | $ 0.1614583 |
Subsequent event | Dividend Declared for Month of January | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  |  |  | 0.15625 |  |  |  | 0.15625 |
Subsequent event | Dividend Declared for Month of January | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  |  |  |  | 0.1458333 |  |  |  | $ 0.1458333 |
Subsequent event | Dividend Declared for Month of January | Senior Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payment date |  |  |  |  |  |  | Feb. 07, 2019 |  |  |  |  |  |
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) |  |  |  |  |  |  |  | $ 0.125 |  |  |  | $ 0.125 |
Scenario, Forecast | Dividend Declared for Month of February |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Record date |  |  |  |  |  | Feb. 20, 2019 |  |  |  |  |  |  |
Payment date |  |  |  |  | Feb. 28, 2019 |  |  |  |  |  |  |  |
Scenario, Forecast | Dividend Declared for Month of February | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  | $ 0.1614583 |  |  |  |  |  | $ 0.1614583 |  |
Scenario, Forecast | Dividend Declared for Month of February | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  | 0.15625 |  |  |  |  |  | 0.15625 |  |
Scenario, Forecast | Dividend Declared for Month of February | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  |  |  |  | 0.1458333 |  |  |  |  |  | $ 0.1458333 |  |
Scenario, Forecast | Dividend Declared for Month of February | Senior Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payment date |  |  |  | Mar. 07, 2019 |  |  |  |  |  |  |  |  |
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) |  |  |  |  | $ 0.125 |  |  |  |  |  | $ 0.125 |  |
Scenario, Forecast | Dividend Declared for Month of March |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Record date |  |  | Mar. 20, 2019 |  |  |  |  |  |  |  |  |  |
Payment date |  | Mar. 29, 2019 |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Dividend Declared for Month of March | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  | $ 0.1614583 |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Dividend Declared for Month of March | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  | 0.15625 |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Dividend Declared for Month of March | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions (in dollars per share) |  | 0.1458333 |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Dividend Declared for Month of March | Senior Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payment date | Apr. 08, 2019 |  |  |  |  |  |  |  |  |  |  |  |
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) |  | $ 0.125 |  |  |  |  |  |  |  |  |  |  |

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