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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
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 29,386 | $ 28,667 | $ 28,197 | $ 28,137 | $ 27,261 | $ 26,591 | $ 26,593 | $ 26,353 | $ 114,387 | $ 106,798 | $ 94,799
Operating expenses | (22,462) | (19,445) | (19,058) | (19,266) | (18,771) | (17,422) | (17,542) | (17,402) | (80,231) | (71,137) | (68,337)
Other expense, net | (6,452) | (7,031) | (6,934) | (4,198) | (5,973) | (6,492) | (6,526) | (4,346) | (24,615) | (23,337) | (20,525)
Net income attributable to the Company | 472 | 2,191 | 2,205 | 4,673 | 2,517 | 2,677 | 2,525 | 4,605 | 9,628 | 12,320 | 5,937
Net loss (income) attributable to OP Units held by Non-controlling OP Unitholders | 100 | 16 | 16 | (45) | (4) | 0 | 0 | 0 | 87 | (4) | 0
Dividends attributable to preferred and senior common stock (1) | (5,877) | (2,838) | (2,837) | (2,836) | (2,844) | (2,847) | (2,842) | (2,814) |  |  |
Net (loss) income (attributable) available to common stockholders | $ (5,305) | $ (631) | $ (616) | $ 1,792 | $ (331) | $ (170) | $ (317) | $ 1,791 | $ (4,760) | $ 973 | $ (4,939)
Net (loss) income (attributable) available to common stockholders - basic & diluted (in shares) | $ (0.18) | $ (0.02) | $ (0.02) | $ 0.06 | $ (0.01) | $ (0.01) | $ (0.01) | $ 0.06 | $ (0.16) | $ 0.03 | $ (0.19)
Other Comprehensive income (loss) | $ 356 | $ (624) | $ (988) | $ (722) | $ (1,212) | $ 245 | $ 289 | $ 495 | $ (1,978) | $ (183) | $ 35
Series A and B Preferred Stock offering costs write off |  |  |  |  |  |  |  |  | $ (2,674) | $ 0 | $ 0

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