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Earnings per Share - Additional Information (Detail)	3 Months Ended
Earnings per Share - Additional Information (Detail)	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Potentially dilutive shares from the calculation of diluted loss per share	615,000	337,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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