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Equity - Schedule of Distributions on Common Stock (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Series A Preferred Stock |  |
Class of Stock [Line Items] |  |
Ordinary Income | 70.74316% | 100.00%
Return of Capital | 29.25684% | 0.00%
Long-term Capital Gain | 0.00% | 0.00%
Series B Preferred Stock |  |
Class of Stock [Line Items] |  |
Ordinary Income | 70.74316% | 100.00%
Return of Capital | 29.25684% | 0.00%
Long-term Capital Gain | 0.00% | 0.00%
Series C Preferred Stock |  |
Class of Stock [Line Items] |  |
Ordinary Income | 70.74316% |
Return of Capital | 29.25684% |
Long-term Capital Gain | 0.00% |
Common Stock |  |
Class of Stock [Line Items] |  |
Ordinary Income | 0.00% | 2.6684%
Return of Capital | 100.00% | 97.3316%
Long-term Capital Gain | 0.00% | 0.00%

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