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Stock Compensation Plans (Stock-Based Compensation Expense And Related Tax Benefits) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 8,922	$ 9,583	$ 12,843	$ 15,912
Less: tax benefit	(2,772)	(2,933)	(4,035)	(5,235)
Total stock-based compensation expense, after tax	6,150	6,650	8,808	10,677
Equity-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	8,282	8,272	11,272	13,089
Liability-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 640	$ 1,311	$ 1,571	$ 2,823

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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