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Real Estate and Intangible Assets - Pro-Forma Condensed Consolidated Statements of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Data: |  |  |  |  |  |  |  |  |  |  |
Total operating revenue |  |  |  |  |  |  |  |  |  |  | $ 88,304
Total operating expenses |  |  |  |  |  |  |  |  |  |  | (56,697)
Other expenses, net |  |  |  |  |  |  |  |  |  |  | (27,429)
Net income |  |  |  |  |  |  |  |  |  |  | 4,178
Dividends attributable to preferred and senior common stock | $ (2,844) | $ (2,847) | $ (2,842) | $ (2,814) | $ (2,802) | $ (2,767) | $ (2,686) | $ (2,621) |  |  | (7,656)
Net loss attributable to common stockholders |  |  |  |  |  |  |  |  |  |  | $ (3,478)
Share and Per Share Data: |  |  |  |  |  |  |  |  |  |  |
Basic and diluted loss per share of common stock - pro forma (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ (0.15)
Loss attributable to common shareholders (in dollars per share) | $ (0.01) | $ (0.01) | $ (0.01) | $ 0.06 | $ (0.17) | $ (0.01) | $ (0.08) | $ 0.07 | $ 0.03 | $ (0.19) | $ (0.16)
Weighted average shares outstanding-basic and diluted (in shares) |  |  |  |  |  |  |  |  | 28,675,934 | 26,358,237 | 23,193,962

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