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Share-Based Plans, Amounts Recognized (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]
Compensation charged against income before income tax benefit	$ 46,694	$ 43,272	$ 41,992
Related income tax benefit recognized in income	$ 10,924	$ 13,053	$ 12,169

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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