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Dilutive and Antidilutive Options (Detail)	3 Months Ended		9 Months Ended
Dilutive and Antidilutive Options (Detail)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Additional shares	1,112,000	994,000	1,124,000	907,000
Antidilutive options	655,000	783,000	664,000	873,000

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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