XML 24 R50.htm IDEA: XBRL DOCUMENT

Summary of Total Stock Based Compensation Expense Included in Condensed Consolidated Statements of Operations 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
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 1,825	$ 1,928	$ 4,145	$ 4,262
Income tax benefit	$ (671)	$ (573)	$ (1,331)	$ (1,232)

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.

+ References+ Details