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Share-Based Plans, Amounts Recognized (Detail) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation charged against income before tax benefit	$ 22,123	$ 21,048
Related income tax benefit recognized in income	$ 6,607	$ 4,744

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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