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Stockholders' and Mezzanine Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders' equity, beginning balance |  |  | $ 266,798 |
Issuance of Series A and B preferred stock and common stock, net |  |  | 3,521 |
Retirement of senior common stock, net |  |  | (34) |
Distributions declared to common, senior common and preferred stockholders |  |  | (26,982) |
Comprehensive income |  |  | 783 |
Net income | $ 2,525 | $ 661 | 7,130 | $ 5,020
Stockholders' equity, ending balance | $ 251,216 |  | $ 251,216 |
Series A and B Preferred Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders' equity, beginning balance (in shares) |  |  | 2,264,000 |
Stockholders' equity, beginning balance |  |  | $ 2 |
Stockholders' equity, ending balance (in shares) | 2,264,000 |  | 2,264,000 |
Stockholders' equity, ending balance | $ 2 |  | $ 2 |
Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders' equity, beginning balance (in shares) |  |  | 28,384,016 |
Stockholders' equity, beginning balance |  |  | $ 28 |
Issuance of preferred stock and common stock, net (in shares) |  |  | 185,084 |
Issuance of Series A and B preferred stock and common stock, net |  |  | $ 1 |
Conversion of senior common stock to common stock (in shares) |  |  | 9,554 |
Stockholders' equity, ending balance (in shares) | 28,578,654 |  | 28,578,654 |
Stockholders' equity, ending balance | $ 29 |  | $ 29 |
Common Stock | Senior Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders' equity, beginning balance (in shares) |  |  | 904,819 |
Stockholders' equity, beginning balance |  |  | $ 1 |
Conversion of senior common stock to common stock (in shares) |  |  | (11,435) |
Retirement of senior common stock, net (in shares) |  |  | (2,266) |
Stockholders' equity, ending balance (in shares) | 891,118 |  | 891,118 |
Stockholders' equity, ending balance | $ 1 |  | $ 1 |
Additional Paid in Capital |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders' equity, beginning balance |  |  | 534,790 |
Issuance of Series A and B preferred stock and common stock, net |  |  | 3,520 |
Retirement of senior common stock, net |  |  | (34) |
Stockholders' equity, ending balance | 538,276 |  | 538,276 |
Accumulated Other Comprehensive Income |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders' equity, beginning balance |  |  | 35 |
Comprehensive income |  |  | 783 |
Stockholders' equity, ending balance | 818 |  | 818 |
Distributions in Excess of Accumulated Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders' equity, beginning balance |  |  | (268,058) |
Distributions declared to common, senior common and preferred stockholders |  |  | (26,982) |
Net income |  |  | 7,130 |
Stockholders' equity, ending balance | $ (287,910) |  | $ (287,910) |

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