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Equity - Schedule of Distributions on Common Stock (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Series A Preferred Stock |  |
Class of Stock [Line Items] |  |
Ordinary Income | 96.85143% | 82.32594%
Return of Capital | 3.14857% | 0.00%
Long-term Capital Gain | 0.00% | 17.67406%
Common Stock |  |
Class of Stock [Line Items] |  |
Ordinary Income | 0.00% | 26.8429%
Return of Capital | 100.00% | 67.39436%
Long-term Capital Gain | 0.00% | 5.76274%

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