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Stockholders' and Mezzanine Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 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 | 2,354 |
Distributions declared to common, senior common and preferred stockholders | (11,983) |
Net income | 4,356 | $ 853
Stockholders' equity, ending balance | $ 234,604 |
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 |
Stockholders' equity, ending balance | $ 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) | 119,356 |
Issuance of Series A and B preferred stock and common stock, net | $ 0 |
Conversion of senior common stock to common stock (in shares) | 1,728 |
Stockholders' equity, ending balance (in shares) | 25,003,842 |
Stockholders' equity, ending balance | $ 25 |
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) | (2,071) |
Stockholders' equity, ending balance (in shares) | 957,481 |
Stockholders' equity, ending balance | $ 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 | 2,354 |
Stockholders' equity, ending balance | 465,790 |
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 | (11,983) |
Net income | 4,356 |
Stockholders' equity, ending balance | $ (231,214) |

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