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Quarterly Financial Information - Summary of Quarterly Results 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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 27,261 | $ 26,591 | $ 26,593 | $ 26,353 | $ 25,253 | $ 24,365 | $ 22,867 | $ 22,314 | $ 106,798 | $ 94,799 | $ 86,372
Operating expenses | (18,771) | (17,422) | (17,542) | (17,402) | (20,405) | (15,867) | (14,357) | (17,708) | (71,137) | (68,337) | (55,595)
Other expense, net | (5,973) | (6,492) | (6,526) | (4,346) | (6,311) | (6,115) | (7,849) | (250) | (23,337) | (20,525) | (26,819)
Net income attributable to the company | 2,517 | 2,677 | 2,525 | 4,605 | (1,463) | 2,383 | 661 | 4,356 | 12,320 | 5,937 | 3,958
Net income attributable to OP Units held by Non-controlling OP Unitholders | (4) | 0 | 0 | 0 |  |  |  |  | (4) | 0 | 0
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 income (loss) available (attributable) to common stockholders | $ (331) | $ (170) | $ (317) | $ 1,791 | $ (4,265) | $ (384) | $ (2,025) | $ 1,735 | $ 973 | $ (4,939) | $ (3,698)
Net income (loss) available (attributable to common stockholders - basic & diluted (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)

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