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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 25,253 | $ 24,365 | $ 22,867 | $ 22,314 | $ 22,009 | $ 21,589 | $ 21,247 | $ 21,527 | $ 94,799 | $ 86,372 | $ 83,766
Operating expenses | (20,405) | (15,867) | (14,357) | (17,708) | (13,733) | (15,172) | (13,433) | (13,257) | (68,337) | (55,595) | (50,965)
Other expense, net | (6,311) | (6,115) | (7,849) | (250) | (5,981) | (6,490) | (6,931) | (7,417) | (20,525) | (26,819) | (29,205)
Net income | (1,463) | 2,383 | 661 | 4,356 | 2,295 | (73) | 883 | 853 | 5,937 | 3,958 | 3,596
Dividends attributable to preferred and senior common stock | (2,802) | (2,767) | (2,686) | (2,621) | (2,607) | (2,256) | (1,514) | (1,279) |  | (7,656) | (5,101)
Net loss attributable to common stockholders | $ (4,265) | $ (384) | $ (2,025) | $ 1,735 | $ (312) | $ (2,329) | $ (631) | $ (426) | $ (4,939) | $ (3,698) | $ (1,505)
Net income (loss) available (attributable to common stockholders - basic & diluted (in dollars per share) | $ (0.17) | $ (0.01) | $ (0.08) | $ 0.07 | $ (0.01) | $ (0.10) | $ (0.03) | $ (0.02) | $ (0.19) | $ (0.16) | $ (0.07)

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