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Weighted Average Common Shares - Additional Information (Detail) (Stock Appreciation Rights (SARs)) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock Appreciation Rights (SARs)
Earnings Per Share Disclosure [Line Items]
Stock options and stock appreciation rights excluded in computation of diluted net loss per common share	3.2	1.6	2.5	1.5

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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