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Total Stock Based Compensation Expense and the Tax Related Benefit (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]
Stock option expense	$ 11,126	$ 10,369	$ 10,420
RSU expense	9,644	9,243	7,227
Total stock based compensation expense	20,770	19,612	17,647
Related deferred income tax benefit	$ 5,775	$ 5,021	$ 4,886

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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