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Earnings (Loss) Per Share - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Common Stock And Eps [Line Items]
Securities excluded from calculation of basic and diluted earnings per share	7.4	5.9
Maximum [Member]
Common Stock And Eps [Line Items]
Average stock price	58.80

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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