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Share-Based Plans, Amounts Recognized (Detail) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation charged against income before tax benefit	$ 32,885	$ 31,594
Related income tax benefit recognized in income	$ 9,883	$ 9,144

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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