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Earnings Per Share - Additional Information (Detail) (Stock Option [Member]) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Stock Option [Member]
Earnings Per Share Disclosure [Line Items]
Anti-dilutive shares not included in the computation of basic and diluted income per share	0.2

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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