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Earnings Per Share - Additional Information (Detail)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Anti-dilutive potentially issuable shares not included in calculation of net loss attributable to common stockholders 2,705us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount