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Dilutive and Antidilutive Options (Detail)	12 Months Ended
Dilutive and Antidilutive Options (Detail)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Additional shares	1,120,500	932,000	730,000
Antidilutive options	673,700	873,800	2,572,000

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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