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Common and Common Equivalent Shares - Schedule of Calculation of Shares Used in Basic and Diluted Net Income Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Weighted Average Number Of Shares Outstanding Reconciliation [Line Items]
Weighted average number of common shares outstanding	49,309	48,269
Weighted average number of dilutive common share equivalents	1,083	1,130
Weighted average number of common and common equivalent shares outstanding	50,392	49,399
Antidilutive securities not included in the dilutive earnings per share calculation		28

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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