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Equity and Mezzanine Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stockholders' equity, beginning balance |  |  |  |  | $ 249,744 |  |
Comprehensive income | $ (624) | $ 245 |  |  | (2,335) | $ 1,028 |
Net income | 2,191 | 2,677 |  |  | 9,068 | 9,807 |
Stockholders' equity, ending balance | 253,771 |  |  |  | 253,771 |  |
Total Equity | 258,253 | 247,124 |  |  | 258,253 | 247,124 | $ 254,419
Senior Common Stock |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stockholders' equity, beginning balance | 1 | 1 |  | $ 1 | 1 | 1 |
Issuance of Series A and B preferred stock and common stock, net | 0 |  | $ 0 | 0 | 0 |  |
Stockholders' equity, ending balance | 1 | 1 | 1 | 1 | 1 | 1 |
Series A and B Preferred Stock |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stockholders' equity, beginning balance | 2 | 2 |  | 2 | 2 | 2 |
Issuance of Series A and B preferred stock and common stock, net | 0 |  | 0 | 0 | 0 |  |
Stockholders' equity, ending balance | 2 | 2 | 2 | 2 | 2 | 2 |
Common Stock |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stockholders' equity, beginning balance | 31 | 29 |  | 28 | 29 | 28 |
Issuance of Series A and B preferred stock and common stock, net | 0 |  | 0 | 1 | 2 |  |
Stockholders' equity, ending balance | 31 | 29 | 29 | 29 | 31 | 29 |
Additional Paid in Capital |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stockholders' equity, beginning balance | 592,706 | 538,276 |  | 534,790 | 559,977 | 534,790 |
Issuance of Series A and B preferred stock and common stock, net | 7,362 |  | 6,619 | 10,139 | 40,608 |  |
Retirement of senior common stock, net | 0 |  | 0 | (34) | 0 |  |
Adjustment to OP Units held by Non-controlling OP Unitholders resulting from changes in ownership of the Operating Partnership | (112) |  | 0 | 0 | (629) |  |
Stockholders' equity, ending balance | 599,956 | 544,895 | 538,276 | 538,276 | 599,956 | 544,895 |
Accumulated Other Comprehensive Income |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stockholders' equity, beginning balance | (1,859) | 818 |  | 35 | (148) | 35 |
Comprehensive income | (624) |  | 245 | 1,028 | (2,335) |  |
Stockholders' equity, ending balance | (2,483) | 1,063 | 818 | 818 | (2,483) | 1,063 |
Distributions in Excess of Accumulated Earnings |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stockholders' equity, beginning balance | (331,461) | (287,910) |  | (268,058) | (310,117) | (268,058) |
Distributions declared to common, senior common, and preferred stockholders | (14,482) |  | (13,633) | (40,615) | (42,674) |  |
Net income | 2,207 |  | 2,677 | 9,807 | 9,055 |  |
Stockholders' equity, ending balance | (343,736) | (298,866) | (287,910) | (287,910) | (343,736) | (298,866) |
Total Stockholders' Equity |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stockholders' equity, beginning balance | 259,420 | 251,216 |  | 266,798 | 249,744 | 266,798 |
Issuance of Series A and B preferred stock and common stock, net | 7,362 |  | 6,619 | 10,140 | 40,610 |  |
Retirement of senior common stock, net | 0 |  | 0 | (34) | 0 |  |
Distributions declared to common, senior common, and preferred stockholders | (14,482) |  | (13,633) | (40,615) | (42,674) |  |
Comprehensive income | (624) |  | 245 | 1,028 | (2,335) |  |
Adjustment to OP Units held by Non-controlling OP Unitholders resulting from changes in ownership of the Operating Partnership | (112) |  | 0 | 0 | (629) |  |
Net income | 2,207 |  | 2,677 | 9,807 | 9,055 |  |
Stockholders' equity, ending balance | 253,771 | 247,124 | 251,216 | 251,216 | 253,771 | 247,124 |
Non-Controlling Interest |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stockholders' equity, beginning balance | 4,665 | 0 |  | 0 | 4,675 | 0 |
Distributions declared to common, senior common, and preferred stockholders | (279) |  | 0 | 0 | (835) |  |
Adjustment to OP Units held by Non-controlling OP Unitholders resulting from changes in ownership of the Operating Partnership | 112 |  | 0 | 0 | 629 |  |
Net income | (16) |  | 0 | 0 | 13 |  |
Stockholders' equity, ending balance | $ 4,482 | $ 0 | $ 0 | $ 0 | $ 4,482 | $ 0 |

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