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Dilutive and Antidilutive Options (Detail)	12 Months Ended
Dilutive and Antidilutive Options (Detail)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Additional shares	932,000	730,000	1,082,000
Antidilutive options	873,800	2,572,000	1,244,700

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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