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Summary of Significant Accounting Policies - Computations of Basic and Diluted Earnings (Loss) per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
NET INCOME (LOSS) $ 1,470 $ 1,140 $ 3,551 $ (1,962)
Weighted average shares of common stock outstanding:        
BASIC 56,482 56,018 56,427 55,897
Dilutive effect of stock options and restricted stock 210 648 473  
Diluted 56,692 56,666 56,900 55,897
BASIC $ 0.03 $ 0.02 $ 0.06 $ (0.04)
DILUTED $ 0.03 $ 0.02 $ 0.06 $ (0.04)