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Net Income (Loss) Per Share - Additional Information (Detail)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Common stock equivalents excluded from the calculation of diluted earnings per share due to decline in market price of stock 2,339us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 5,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount