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Earning (Loss) Per Share - Additional Information (Detail)
3 Months Ended
Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Antidilutive securities excluded from computation of earnings (loss) per share, amount 1,421,950us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount