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Net Income Per Share - Additional Information (Detail) - $ / shares
shares in Thousands
3 Months Ended 6 Months Ended
Mar. 10, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Line Items]          
Exercisable options outstanding that enable to purchase shares   825 825 825 825
Shares with dilutive effect and included in computation of diluted income (loss) per share   25   11  
Restricted stock          
Earnings Per Share [Line Items]          
Shares with dilutive effect and included in computation of diluted income (loss) per share     5   5
Restricted stock | Executive Officer          
Earnings Per Share [Line Items]          
Compensation awarded restricted stock units 141        
Closing market price of the common stock $ (2.44)        
Equity option          
Earnings Per Share [Line Items]          
Shares with dilutive effect and included in computation of diluted income (loss) per share   339 291 318 299
Options excluded from computation of diluted income (loss) per share due to anti-dilutive effect   260 350 260 350