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Equity - Monthly Distributions Declared and Paid by Company's Board of Directors (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Class of Stock [Line Items] |  |  |  |
Dividends Payable | $ 3 |  | $ 3 |
Series A Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Distributions per Preferred Share (in dollars per share) | $ 0.3984375 | $ 0.3984375 | $ 0.7968750 | $ 0.7968750
Series B Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Distributions per Preferred Share (in dollars per share) | 0.125 | 0.000 | 0.125 | 0.000
Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Distributions per Common Share (in dollars per share) | $ 0.13290 | $ 0.13050 | $ 0.26565 | $ 0.25950

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