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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 12 Months Ended
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
Numerator:                      
Net income (loss): $ 914 $ (17,112) $ (7,033) $ (5,986) $ (21,533) $ 133,551 $ 15,091 $ (14,941) $ (29,217) $ 112,168 $ (34,765)
Adjustments for basic net income (loss) per common share:                      
Dividend requirements on Series E Redeemable Preferred                 (23,443) (27,761) (2,287)
Dividend and dividend requirements                 (300) (300) (300)
Accretion of redeemable preferred stock                 (6,487) (18,256) (686)
Net income attributable to participating securities                   (1,091)  
Net income (loss) attributable to common stockholders $ (6,991) $ (24,745) $ (14,515) $ (13,196) $ (28,654) $ 112,047 $ 5,055 $ (24,609) (59,447) 64,760 (38,038)
Dividends on convertible preferred stocks assumed to be converted, if dilutive                     300
Numerator for diluted net income (loss) per common share                 $ (59,447) $ 64,760 $ (37,738)
Denominator:                      
Denominator for basic and dilutive net income (loss) per common share - adjusted weighted-average shares                 27,250,876 25,454,311 22,758,873
Basic net income (loss) per common share:                      
Loss from continuing operations $ (0.30) $ (0.91) $ (0.53) $ (0.48) $ (1.19) $ (2.25) $ (0.70) $ (1.11) $ (2.22) $ (5.28) $ (2.17)
Income from discontinued operations, net of taxes 0.04       0.13 6.39 0.90 0.03 0.04 7.82 0.50
Net income (loss) (0.26) (0.91) (0.53) (0.48) (1.06) 4.14 0.20 (1.08) (2.18) 2.54 (1.67)
Diluted net income (loss) per common share:                      
Loss from continuing operations (0.30) (0.91) (0.53) (0.48) (1.19) (2.25) (0.70) (1.11) (2.22) (5.28) (2.17)
Income from discontinued operations, net of taxes 0.04       0.13 6.39 0.90 0.03 0.04 7.82 0.50
Net income (loss) $ (0.26) $ (0.91) $ (0.53) $ (0.48) $ (1.06) $ 4.14 $ 0.20 $ (1.08) $ (2.18) $ 2.54 $ (1.67)
Series E Redeemable Preferred Stock [Member]                      
Adjustments for basic net income (loss) per common share:                      
Dividend requirements on Series E Redeemable Preferred                 $ (23,443) $ (27,761) $ (2,287)
Accretion of redeemable preferred stock                 (6,487) (18,256) (686)
Series B Preferred Stock [Member]                      
Adjustments for basic net income (loss) per common share:                      
Dividend and dividend requirements                 (240) (240) (240)
Series D Preferred Stock [Member]                      
Adjustments for basic net income (loss) per common share:                      
Dividend and dividend requirements                 $ (60) $ (60) $ (60)