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Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) - $ / shares | Apr. 05, 2021 | Mar. 31, 2021 | Mar. 25, 2021 | Mar. 24, 2021 | Mar. 18, 2021 | Mar. 05, 2021 | Feb. 28, 2021 | Feb. 26, 2021 | Feb. 24, 2021 | Feb. 17, 2021 | Feb. 05, 2021 | Jan. 29, 2021 | Jan. 27, 2021 | Jan. 22, 2021 | Jan. 14, 2021
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Subsequent Event | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1328125
Subsequent Event | Series A Preferred Stock | Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 22, 2021 |
Payment Date |  |  |  |  |  |  |  |  |  |  |  | Jan. 29, 2021 |  |  |
Distribution per Share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1328125 |
Subsequent Event | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.375
Subsequent Event | Series B Preferred Stock | Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 27, 2021 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  | Feb. 05, 2021 |  |  |  |
Distribution per Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.125 |  |
Subsequent Event | Series B Preferred Stock | Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  |  |  |  |  |  | Feb. 24, 2021 |  |  |  |  |  |
Distribution per Share |  |  |  |  |  |  |  |  | $ 0.125 |  |  |  |  |  |
Subsequent Event | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.375
Subsequent Event | Series C Preferred Stock | Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 27, 2021 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  | Feb. 05, 2021 |  |  |  |
Distribution per Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.125 |  |
Subsequent Event | Series C Preferred Stock | Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  |  |  |  |  |  | Feb. 24, 2021 |  |  |  |  |  |
Distribution per Share |  |  |  |  |  |  |  |  | $ 0.125 |  |  |  |  |  |
Subsequent Event | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.246528
Subsequent Event | Series D Preferred Stock | Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  |  |  |  |  |  |  | Feb. 17, 2021 |  |  |  |  |
Distribution per Share |  |  |  |  |  |  |  |  |  | $ 0.142361 |  |  |  |  |
Subsequent Event | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.13485
Subsequent Event | Common Stock | Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 22, 2021 |
Payment Date |  |  |  |  |  |  |  |  |  |  |  | Jan. 29, 2021 |  |  |
Distribution per Share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.04495 |
Subsequent Event | Common Stock | Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  |  |  |  |  |  |  | Feb. 17, 2021 |  |  |  |  |
Distribution per Share |  |  |  |  |  |  |  |  |  | $ 0.04495 |  |  |  |  |
Forecast | Series B Preferred Stock | Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment Date |  |  |  |  |  | Mar. 05, 2021 |  |  |  |  |  |  |  |  |
Forecast | Series B Preferred Stock | Period Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  | Mar. 24, 2021 |  |  |  |  |  |  |  |  |  |  |
Payment Date | Apr. 05, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per Share |  |  |  | $ 0.125 |  |  |  |  |  |  |  |  |  |  |
Forecast | Series C Preferred Stock | Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment Date |  |  |  |  |  | Mar. 05, 2021 |  |  |  |  |  |  |  |  |
Forecast | Series C Preferred Stock | Period Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  | Mar. 24, 2021 |  |  |  |  |  |  |  |  |  |  |
Payment Date | Apr. 05, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per Share |  |  |  | $ 0.125 |  |  |  |  |  |  |  |  |  |  |
Forecast | Series D Preferred Stock | Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment Date |  |  |  |  |  |  | Feb. 28, 2021 |  |  |  |  |  |  |  |
Forecast | Series D Preferred Stock | Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record Date |  |  | Mar. 25, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Payment Date | Apr. 05, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per Share |  |  | $ 0.104167 |  |  |  |  |  |  |  |  |  |  |  |
Forecast | Common Stock | Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment Date |  |  |  |  |  |  |  | Feb. 26, 2021 |  |  |  |  |  |  |
Forecast | Common Stock | Period Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  |  | Mar. 18, 2021 |  |  |  |  |  |  |  |  |  |
Payment Date |  | Mar. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per Share |  |  |  |  | $ 0.04495 |  |  |  |  |  |  |  |  |  |

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