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Share-Based Compensation Expenses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Disclosure Share Based Compensation Expenses [Abstract]
Option plan	$ 5,124	$ 4,101
Other share-based awards	10,132	18,926
Total share-based compensation before tax	15,256	23,027
Tax benefit	5,698	8,607
Total share-based compensation expense included in net income	$ 9,558	$ 14,420

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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