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Income (Loss) Per Common Share - Computation of Basic and Diluted Net Income (Loss) Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator:        
Net income (loss) $ (17,112) $ 133,551 $ (30,131) $ 133,701
Adjustments for basic net income (loss) per common share:        
Dividend requirements (75) (75) (225) (225)
Net income attributable to participating securities   (1,920)   (1,718)
Net income (loss) attributable to common stockholders $ (24,745) $ 112,047 $ (52,456) $ 92,787
Denominator:        
Denominator for basic and dilutive net income (loss) per common share - adjusted weighted-average shares 27,249,304 27,075,629 27,248,889 24,926,471
Basic net income (loss) per common share:        
Loss from continuing operations $ (0.91) $ (2.25) $ (1.93) $ (4.17)
Income from discontinued operations, net of taxes   6.39   7.89
Net income (loss) (0.91) 4.14 (1.93) 3.72
Diluted net income (loss) per common share:        
Loss from continuing operations (0.91) (2.25) (1.93) (4.17)
Income from discontinued operations, net of taxes   6.39   7.89
Net income (loss) $ (0.91) $ 4.14 $ (1.93) $ 3.72
Series E Redeemable Preferred Stock [Member]        
Adjustments for basic net income (loss) per common share:        
Dividend requirements on Series E Redeemable Preferred $ (5,923) $ (7,372) $ (17,248) $ (22,351)
Accretion of redeemable preferred stock (1,635) (12,137) (4,852) (16,620)
Series B Preferred Stock [Member]        
Adjustments for basic net income (loss) per common share:        
Dividend requirements (60) (60) (180) (180)
Series D Preferred Stock [Member]        
Adjustments for basic net income (loss) per common share:        
Dividend requirements $ (15) $ (15) $ (45) $ (45)