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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating Data: |  |  |  |  |  |  |  |  |  |  |
Total operating revenue |  |  |  |  |  |  |  |  | $ 88,304 | $ 89,720 | $ 87,439
Total operating expenses |  |  |  |  |  |  |  |  | (56,697) | (54,480) | (66,052)
Other expenses |  |  |  |  |  |  |  |  | (27,429) | (31,014) | (26,014)
Net income (loss) |  |  |  |  |  |  |  |  | 4,178 | 4,226 | (4,627)
Dividends attributable to preferred and senior common stock | $ (2,607) | $ (2,256) | $ (1,514) | $ (1,279) | $ (1,284) | $ (1,286) | $ (1,284) | $ (1,247) | (7,656) | (5,101) | (4,636)
Net loss attributable to common stockholders |  |  |  |  |  |  |  |  | $ (3,478) | $ (875) | $ (9,263)
Share and Per Share Data: |  |  |  |  |  |  |  |  |  |  |
Basic and diluted loss per share of common stock - pro forma (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.15) | $ (0.04) | $ (0.54)
Loss per weighted average share of common stock - basic & diluted, Loss attributable to common shareholders (in dollars per share) | $ (0.01) | $ (0.10) | $ (0.03) | $ (0.02) | $ 0.06 | $ (0.06) | $ (0.04) | $ (0.03) | $ (0.16) | $ (0.07) | $ (0.61)
Weighted average shares outstanding-basic and diluted (in shares) |  |  |  |  |  |  |  |  | 23,193,962 | 21,159,597 | 17,253,503

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