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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, 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
Numerator:                      
Net income (loss): $ (21,533) $ 133,551 $ 15,091 $ (14,941) $ (8,068) $ (33,763) $ 417 $ 6,649 $ 112,168 $ (34,765) $ 19,634
Adjustments for basic net income (loss) per Common share:                      
Dividend requirements on Series E Redeemable Preferred                 (27,761) (2,287)  
Dividend and dividend requirements                 (300) (300) (300)
Accretion of redeemable preferred stock                 (18,256) (686)  
Net income attributable to participating securities                 (1,091)    
Net income (loss) attributable to common stockholders $ (28,654) $ 112,047 $ 5,055 $ (24,609) $ (11,041) $ (33,763) $ 417 $ 6,349 64,760 (38,038) 19,334
Dividends on convertible preferred stocks assumed to be converted, if dilutive                   300  
Numerator for diluted net income (loss) per common share                 $ 64,760 $ (37,738) $ 19,334
Denominator:                      
Denominator for basic net income (loss) per common share - weighted- average shares                 25,454,311 22,758,873 22,575,053
Effect of dilutive securities:                      
Stock options                     175,753
Dilutive potential common shares                     175,753
Denominator for dilutive net income (loss) per common share - adjusted weighted-average shares and assumed conversions                 25,454,311 22,758,873 22,750,806
Basic net income (loss) per common share:                      
Income (loss) from continuing operations $ (1.19) $ (2.25) $ (0.70) $ (1.11) $ (0.61) $ (1.60) $ (0.13) $ 0.17 $ (5.28) $ (2.17) $ 0.21
Net income (loss) (1.06) 4.14 0.20 (1.08) (0.48) (1.48) 0.02 0.28 2.54 (1.67) 0.86
Income from discontinued operations, net of taxes 0.13 6.39 0.90 0.03 0.13 0.12 0.15 0.11 7.82 0.50 0.65
Diluted net income (loss) per common share:                      
Income (loss) from continuing operations (1.19) (2.25) (0.70) (1.11) (0.61) (1.60) (0.13) 0.17 (5.28) (2.17) 0.21
Net income (loss) (1.06) 4.14 0.20 (1.08) (0.48) (1.48) 0.02 0.28 2.54 (1.67) 0.85
Income from discontinued operations, net of taxes $ 0.13 $ 6.39 $ 0.90 $ 0.03 $ 0.13 $ 0.12 $ 0.15 $ 0.11 $ 7.82 $ 0.50 $ 0.64
Series E Redeemable Preferred Stock [Member]                      
Adjustments for basic net income (loss) per Common share:                      
Dividend requirements on Series E Redeemable Preferred                 $ (27,761) $ (2,287)  
Accretion of redeemable preferred stock                 (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)