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Stock-Based Compensation (Detail) - (Table 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended		15 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012
Total	$ 4,711	$ 12,660	$ 8,337	$ 2,772
Restricted Stock [Member]
Allocated Share-based Compensation Expense	3,319	8,177	4,050	1,093
Stock Options [Member]
Allocated Share-based Compensation Expense	$ 1,392	$ 4,483	$ 4,287	$ 1,679

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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