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Stock-Based Compensation Recorded in Corporate Expense, Net, on Consolidated Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock compensation expense before tax benefit	$ 998	$ 8,452	$ 5,159
Income tax benefit	384	3,254	2,060
Stock compensation expense after tax benefit	$ 614	$ 5,198	$ 3,099

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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