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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders' equity, beginning balance |  |  | $ 239,877 |
Issuance of Series A and B preferred stock and common stock, net |  |  | 17,887 |
Distributions declared to common, senior common and preferred stockholders |  |  | (24,159) |
Other comprehensive income |  |  | 179 |
Net income | $ 661 | $ 883 | 5,020 | $ 1,738
Stockholders' equity, ending balance | $ 238,804 |  | $ 238,804 |
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) |  |  | 24,882,758 |
Stockholders' equity, beginning balance |  |  | $ 25 |
Issuance of preferred stock and common stock, net (in shares) |  |  | 855,238 |
Issuance of Series A and B preferred stock and common stock, net |  |  | $ 1 |
Conversion of senior common stock to common stock (in shares) |  |  | 16,880 |
Stockholders' equity, ending balance (in shares) | 25,754,876 |  | 25,754,876 |
Stockholders' equity, ending balance | $ 26 |  | $ 26 |
Common Stock | Senior Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders' equity, beginning balance (in shares) |  |  | 959,552 |
Stockholders' equity, beginning balance |  |  | $ 1 |
Conversion of senior common stock to common stock (in shares) |  |  | (18,768) |
Stockholders' equity, ending balance (in shares) | 940,784 |  | 940,784 |
Stockholders' equity, ending balance | $ 1 |  | $ 1 |
Additional Paid in Capital |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders' equity, beginning balance |  |  | 463,436 |
Issuance of Series A and B preferred stock and common stock, net |  |  | 17,886 |
Stockholders' equity, ending balance | 481,322 |  | 481,322 |
Other Comprehensive Income |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders' equity, beginning balance |  |  | 0 |
Other comprehensive income |  |  | 179 |
Stockholders' equity, ending balance | 179 |  | 179 |
Distributions in Excess of Accumulated Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders' equity, beginning balance |  |  | (223,587) |
Distributions declared to common, senior common and preferred stockholders |  |  | (24,159) |
Net income |  |  | 5,020 |
Stockholders' equity, ending balance | $ (242,726) |  | $ (242,726) |

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