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Income (Loss) Per Common Share - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income (loss) per common share:
Weighted Average Number of Shares, Restricted Stock Liability Awards	2,900,000	3,000,000	2,800,000	2,900,000
Stock appreciation rights excluded from earning per share calculation	796		181,000

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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