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Earnings Per Share - Additional Information (Detail) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share Basic And Diluted [Line Items]
Potentially dilutive shares not included in the computation of the diluted EPS	0	0
Shares from treasury stock utilized by Stock Incentive Plan		0.4	0.4

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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