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Net Income (Loss) Per Common Share - Schedule of Computation of Dilutive Effect, Calculated to Indicate Impact of Net Income and Anti-Dilutive Common Stock Equivalents (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Numerator for diluted net income (loss) per share:          
Net income (loss) $ 17,322 $ (2,484) $ 13,942 $ (6,300) $ 338
Preferred deemed dividend     (9,455)    
Less: Net income (loss) attributed to participating securities 100 (10) 30 (29)  
Net income (loss) attributable to common shareholders, net of income (loss) attributable to participating securities $ 17,222 $ (2,474) $ 4,457 $ (6,271)  
Denominator for diluted net income (loss) per share:          
Weighted-average shares outstanding - basic 200,999,481 200,385,364 200,738,227 200,221,425  
Effect of dilutive potential shares 42,587,735   35,224,877    
Denominator for diluted net income (loss) per share: 243,587,216 200,385,364 235,963,104 200,221,425  
Diluted net income (loss) per share attributable to common shareholders $ 0.07 $ (0.01) $ 0.02 $ (0.03)