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Earnings Per Share - Common Shares Related to Stock Options and RSUs Excluded from Calculated Diluted Net Income Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Stock options	1,741	3,901	3,159	2,861
RSUs	48		24	30
Total	1,789	3,901	3,183	2,891

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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