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Share-Based Compensation - Income Tax Benefit Recognized for Our Share-Based Compensation Arrangements (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total share-based compensation cost	$ 12,374	$ 11,241	$ 12,177
Income tax benefit	$ 4,812	$ 4,372	$ 4,736

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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