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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, 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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 22,009 | $ 21,589 | $ 21,247 | $ 21,527 | $ 21,823 | $ 21,375 | $ 20,688 | $ 19,880 | $ 86,372 | $ 83,766 | $ 73,756
Operating expenses | (13,733) | (15,172) | (13,433) | (13,257) | (12,970) | (13,643) | (12,595) | (11,757) | (55,595) | (50,965) | (57,406)
Other expense | (5,981) | (6,490) | (6,931) | (7,417) | (6,286) | (7,828) | (7,662) | (7,429) | (26,819) | (29,205) | (22,252)
Net income (loss) | 2,295 | (73) | 883 | 853 | 2,567 | (96) | 431 | 694 | 3,958 | 3,596 | (5,902)
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 | $ (312) | $ (2,329) | $ (631) | $ (426) | $ 1,283 | $ (1,382) | $ (853) | $ (553) | $ (3,698) | $ (1,505) | $ (10,538)
Net income (loss) available (attributable to common stockholders - basic & diluted (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)

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