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Dilutive and Antidilutive Options (Detail)	3 Months Ended
Dilutive and Antidilutive Options (Detail)	Mar. 31, 2014	Mar. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Additional shares	1,102,600	800,600
Antidilutive options	656,200	2,306,800

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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