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Summary of Significant Accounting Policies - Computations of Basic and Diluted Earnings (Loss) per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
NET INCOME (LOSS) $ 2,529 $ (5,285) $ (3,102) $ (15,511)
Weighted average shares of common stock outstanding:        
BASIC 55,907 55,559 55,846 55,504
Dilutive effect of stock options and restricted stock 1,336      
Diluted 57,243 55,559 55,846 55,504
BASIC $ 0.05 $ (0.10) $ (0.06) $ (0.28)
DILUTED $ 0.04 $ (0.10) $ (0.06) $ (0.28)