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Stock-Based Compensation (Detail) - (Table 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Total	$ 17,434	$ 11,404	$ 8,271
Restricted Stock [Member]
Allocated Share-based Compensation Expense	11,622	5,787	3,724
Stock Options [Member]
Allocated Share-based Compensation Expense	$ 5,812	$ 5,617	$ 4,547

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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