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Share-Based Compensation Expenses (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option plan	$ 16,497	$ 9,948	$ 6,132
Other share-based awards	56,770	63,872	52,807
Total share-based compensation before tax	73,267	73,820	58,939
Tax benefit	27,401	27,929	23,039
Total share-based compensation expense included in Net income	$ 45,866	$ 45,891	$ 35,900

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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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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