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Dilutive and Antidilutive Options (Detail)	3 Months Ended		6 Months Ended
Dilutive and Antidilutive Options (Detail)	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Additional shares	1,154,100	906,200	1,129,400	836,000
Antidilutive options	655,800	828,800	661,700	1,391,700

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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