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Stockholders' and Mezzanine Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 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 |  |  | 10,140 |
Retirement of senior common stock, net |  |  | (34) |
Distributions declared to common, senior common and preferred stockholders |  |  | (40,615) |
Comprehensive income |  |  | 1,028 |
Net income | $ 2,677 | $ 2,383 | 9,807 | $ 7,403
Stockholders' equity, ending balance | $ 247,124 |  | $ 247,124 |
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) |  |  | 526,323 |
Issuance of Series A and B preferred stock and common stock, net |  |  | $ 1 |
Conversion of senior common stock to common stock (in shares) |  |  | 16,129 |
Stockholders' equity, ending balance (in shares) | 28,926,468 |  | 28,926,468 |
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) |  |  | (19,548) |
Retirement of senior common stock, net (in shares) |  |  | (2,266) |
Stockholders' equity, ending balance (in shares) | 883,005 |  | 883,005 |
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 |  |  | 10,139 |
Retirement of senior common stock, net |  |  | (34) |
Stockholders' equity, ending balance | 544,895 |  | 544,895 |
Accumulated Other Comprehensive Income |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders' equity, beginning balance |  |  | 35 |
Comprehensive income |  |  | 1,028 |
Stockholders' equity, ending balance | 1,063 |  | 1,063 |
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 |  |  | (40,615) |
Net income |  |  | 9,807 |
Stockholders' equity, ending balance | $ (298,866) |  | $ (298,866) |

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