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Dilutive and Antidilutive Options (Detail)	3 Months Ended		9 Months Ended
Dilutive and Antidilutive Options (Detail)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Additional shares	994,000	689,000	907,000	746,000
Antidilutive options	783,000	2,495,000	873,000	2,552,000

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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