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Net Income (Loss) Per Share - Computation of Basic and Diluted Income (Loss) Per Common Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]        
Net income (loss) $ (3,928) $ 6,604 $ (19,295) $ 2,944
Less: undistributed earnings allocated to participating securities   (6,435)   (2,944)
Net income (loss) allocable to common shares (3,928) 169 (19,295)  
Basic weighted average common shares outstanding 27,751,437 1,184,507 27,227,151 1,463,798
Basic income (loss) per common share $ (0.14) $ 0.14 $ (0.71) $ 0.00
Net income (loss) (3,928) 6,604 (19,295) 2,944
Less: undistributed earnings allocated to participating securities and other add-backs to net loss   (6,404)   (2,944)
Net income (loss) allocable to common shares $ (3,928) $ 200 $ (19,295)  
Basic weighted average common shares outstanding 27,751,437 1,184,507 27,227,151 1,463,798
Effect of dilutive securities   20,058,472   20,445,061
Diluted weighted average common shares outstanding 27,751,437 21,242,979 27,227,151 21,908,859
Diluted income (loss) per common share $ (0.14) $ 0.01 $ (0.71) $ 0.00