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Common And Common Equivalent Shares (Schedule Of Calculation Of Shares Used In The Basic And Diluted Net Income Per Share) (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of common shares outstanding	48,543	47,531	48,408	47,341
Weighted average number of dilutive common share equivalents	1,002	1,199	1,066	1,206
Weighted average number of common and common equivalent shares outstanding	49,545	48,730	49,474	48,547
Antidilutive securities not included in the dilutive earnings per share calculation	40	63	34	50

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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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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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