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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator:        
Net income (loss) $ 133,551 $ (33,763) $ 133,701 $ (26,697)
Adjustments for basic net income (loss) per common share:        
Dividend and dividend requirements     (22,351)  
Accretion of redeemable preferred stocks     (16,620)  
Net income attributable to participating securities (1,920)   (1,718)  
Net income (loss) attributable to common stockholders 112,047 (33,763) 92,787 (26,997)
Numerator for diluted net income (loss) per common share $ 112,047 $ (33,763) $ 92,787 $ (26,997)
Denominator:        
Denominator for basic net income (loss) per common share - weighted-average shares 27,075,629 22,799,007 24,926,471 22,741,012
Effect of dilutive securities:        
Denominator for dilutive net income (loss) per common share - adjusted weighted-average shares and assumed conversions 27,075,629 22,799,007 24,926,471 22,741,012
Basic net income (loss) per common share:        
Loss from continuing operations $ (2.25) $ (1.60) $ (4.17) $ (1.56)
Income from discontinued operations, net of taxes 6.39 0.12 7.89 0.37
Net income (loss) 4.14 (1.48) 3.72 (1.19)
Diluted net income (loss) per common share:        
Loss from continuing operations (2.25) (1.60) (4.17) (1.56)
Income from discontinued operations, net of taxes 6.39 0.12 7.89 0.37
Net income (loss) $ 4.14 $ (1.48) $ 3.72 $ (1.19)
Series E Redeemable Preferred Stock [Member]        
Adjustments for basic net income (loss) per common share:        
Dividend and dividend requirements $ (7,372)   $ (22,351)  
Accretion of redeemable preferred stocks (12,137)   (16,620)  
Series B Preferred Stock [Member]        
Adjustments for basic net income (loss) per common share:        
Dividend and dividend requirements (60)   (180) $ (240)
Series D Preferred Stock [Member]        
Adjustments for basic net income (loss) per common share:        
Dividend and dividend requirements $ (15)   $ (45) $ (60)