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Earnings Per Share - Additional Information (Detail) (Stock Appreciation Rights) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stock Appreciation Rights
Earnings Per Share Disclosure [Line Items]
Anti-dilutive securities	18	11

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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