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Weighted Average Shares - Calculation of Weighted Average Shares (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Weighted Average Number Of Shares Outstanding Reconciliation [Line Items]
Basic weighted-average common shares outstanding	42,833	41,859	39,924
Effect of dilutive stock options	807	903	373
Diluted weighted-average common and common-equivalent shares outstanding	43,640	42,762	40,297

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

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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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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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