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Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) - $ / shares | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Mar. 26, 2019 | Mar. 20, 2019 | Feb. 26, 2019 | Feb. 20, 2019 | Jan. 23, 2019 | Jan. 18, 2019 | Jan. 08, 2019
Series A Preferred Stock | Period One |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Record Date | Jan. 18, 2019 |  |  |  |  |  |  |
Payment Date | Jan. 31, 2019 |  |  |  |  |  |  |
Series A Preferred Stock | Period Two |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Record Date | Feb. 20, 2019 |  |  |  |  |  |  |
Payment Date | Feb. 28, 2019 |  |  |  |  |  |  |
Series A Preferred Stock | Period Three |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Record Date | Mar. 20, 2019 |  |  |  |  |  |  |
Payment Date | Mar. 29, 2019 |  |  |  |  |  |  |
Series B Preferred Stock | Period One |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Record Date | Jan. 23, 2019 |  |  |  |  |  |  |
Payment Date | Feb. 01, 2019 |  |  |  |  |  |  |
Series B Preferred Stock | Period Two |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Record Date | Feb. 26, 2019 |  |  |  |  |  |  |
Payment Date | Mar. 07, 2019 |  |  |  |  |  |  |
Series B Preferred Stock | Period Three |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Record Date | Mar. 26, 2019 |  |  |  |  |  |  |
Payment Date | Apr. 04, 2019 |  |  |  |  |  |  |
Common Stock | Period One |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Record Date | Jan. 18, 2019 |  |  |  |  |  |  |
Payment Date | Jan. 31, 2019 |  |  |  |  |  |  |
Common Stock | Period Two |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Record Date | Feb. 20, 2019 |  |  |  |  |  |  |
Payment Date | Feb. 28, 2019 |  |  |  |  |  |  |
Common Stock | Period Three |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Record Date | Mar. 20, 2019 |  |  |  |  |  |  |
Payment Date | Mar. 29, 2019 |  |  |  |  |  |  |
Subsequent Event | Series A Preferred Stock |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  |  |  | $ 0.3984375
Subsequent Event | Series A Preferred Stock | Period One |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  | $ 0.125 |  |
Subsequent Event | Common Stock |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  |  |  | $ 0.13335
Subsequent Event | Common Stock | Period One |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  |  | $ 0.04445 |
Forecast | Series A Preferred Stock | Period Two |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Distribution per Share |  |  |  |  | $ 0.1328125 |  |  |
Forecast | Series A Preferred Stock | Period Three |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Distribution per Share |  |  | $ 0.1328125 |  |  |  |  |
Forecast | Series B Preferred Stock | Period Two |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Distribution per Share |  |  |  | $ 0.125 |  |  |  |
Forecast | Series B Preferred Stock | Period Three |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Distribution per Share |  | $ 0.125 |  |  |  |  |  |
Forecast | Common Stock | Period Two |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Distribution per Share |  |  |  |  | $ 0.04445 |  |  |
Forecast | Common Stock | Period Three |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Distribution per Share |  |  | $ 0.04445 |  |  |  |  |

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