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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		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 33	$ 1,058	$ 4,164	$ 5,320
Income tax benefit	$ (103)	$ (279)	$ (1,435)	$ (1,511)

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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