Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Information - Summary of Quarterly Results of Operations (Detail)

v3.3.1.900
Quarterly Financial Information - Summary of Quarterly Results of Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Operating revenues $ 21,823 $ 21,375 $ 20,688 $ 19,880 $ 19,216 $ 19,014 $ 18,390 $ 17,136 $ 83,766 $ 73,756 $ 61,343
Operating expenses 12,970 13,643 12,595 11,757 10,970 11,457 11,243 23,736 50,965 57,406 32,823
Other expense 6,286 7,828 7,662 7,429 (2,082) (7,328) (5,928) (6,914) (29,205) (22,252) (26,993)
Net income (loss) 2,567 (96) 431 694 6,164 229 1,219 (13,514) 3,596 (5,902) 1,527
Dividends attributable to preferred and senior common stock (1,284) (1,286) (1,284) (1,247) (1,220) (1,160) (1,133) (1,123) (5,101) (4,636) (4,394)
Net income (loss) available (attributable) to common stockholders $ 1,283 $ (1,382) $ (853) $ (553) $ 4,944 $ (931) $ 86 $ (14,637) $ (1,505) $ (10,538) $ (2,867)
Net income (loss) available (attributable to common stockholders - basic & diluted $ 0.06 $ (0.06) $ (0.04) $ (0.03) $ 0.36 $ (0.05) $ 0.01 $ (0.93) $ (0.07) $ (0.61) $ (0.22)