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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, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 10,127	$ 8,922	$ 16,101	$ 12,843
Less: tax benefit	(3,114)	(2,772)	(5,021)	(4,035)
Total stock-based compensation expense, after tax	7,013	6,150	11,080	8,808
Equity-based awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	9,527	8,282	14,050	11,272
Liability-based awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 600	$ 640	$ 2,051	$ 1,571

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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