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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator:        
Net income $ 15,091 $ 417 $ 150 $ 7,066
Adjustments for basic net income (loss) per common share:        
Dividend and dividend requirements     (14,979)  
Accretion of redeemable preferred stocks     (4,484)  
Net income attributable to participating securities (91)      
Net income (loss) attributable to common stockholders 5,055 417 (19,463) 6,766
Numerator for diluted net income (loss) per common share $ 5,055 $ 417 $ (19,463) $ 6,766
Denominator:        
Denominator for basic net income (loss) per common share - weighted- average shares 25,240,224 22,747,925 23,822,768 22,711,534
Effect of dilutive securities:        
Stock options       108,151
Dilutive potential common shares       108,151
Denominator for dilutive net income (loss) per common share - adjusted weighted-average shares and assumed conversions 25,240,224 22,747,925 23,822,768 22,819,685
Basic net income (loss) per common share:        
Loss from continuing operations $ (0.70) $ (0.13) $ (1.81) $ 0.05
Income from discontinued operations, including taxes 0.90 0.15 0.99 0.25
Net income (loss) 0.20 0.02 (0.82) 0.30
Diluted net income (loss) per common share:        
Loss from continuing operations (0.70) (0.13) (1.81) 0.05
Income from discontinued operations, including taxes 0.90 0.15 0.99 0.24
Net income (loss) $ 0.20 $ 0.02 $ (0.82) $ 0.29
Series E Redeemable Preferred Stock [Member]        
Adjustments for basic net income (loss) per common share:        
Dividend and dividend requirements $ (7,629)   $ (14,979)  
Accretion of redeemable preferred stocks (2,241)   (4,484)  
Series B Preferred Stock [Member]        
Adjustments for basic net income (loss) per common share:        
Dividend and dividend requirements (60)   (120) $ (240)
Series D Preferred Stock [Member]        
Adjustments for basic net income (loss) per common share:        
Dividend and dividend requirements $ (15)   $ (30) $ (60)