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Shares Used in Computing Net Income Per Share - Additional Information (Detail) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Weighted Average Number of Shares Outstanding [Line Items]
Stock options excluded from the calculation of diluted weighted-average outstanding shares because their impact was anti-dilutive	0.7	1.1

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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