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Share-Based Compensation Expenses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Disclosure Share Based Compensation Expenses [Abstract]
Option plan	$ 5,866	$ 4,286	$ 16,843	$ 12,643
Other share-based awards	23,810	17,053	41,915	44,349
Total share-based compensation before tax	29,676	21,339	58,758	56,992
Tax benefit	11,073	7,965	21,939	21,318
Total share-based compensation expense included in net income	$ 18,603	$ 13,374	$ 36,819	$ 35,674

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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