Share-Based Compensation Expenses (Detail) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option plan	$ 2,326	$ 1,424	$ 7,047	$ 3,993
Other share-based awards	3,572	16,305	43,899	33,755
Total share-based compensation before tax	5,898	17,729	50,946	37,748
Tax benefit	2,243	6,883	19,338	14,742
Total share-based compensation expense included in net income	$ 3,655	$ 10,846	$ 31,608	$ 23,006

Other stock based compensation expense (i.e. nonvested stock units and performance-based awards).

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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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The amount of expense, net of income tax, 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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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