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Stock-Based Compensation (Detail) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
Stock-Based Compensation (Detail) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2012 Restricted Stock Units (RSUs) [Member]	Mar. 31, 2011 Restricted Stock Units (RSUs) [Member]	Jun. 30, 2012 Restricted Stock Units (RSUs) [Member]	Jun. 30, 2011 Restricted Stock Units (RSUs) [Member]
Share-based Compensation	$ 1,900,000	$ 900,000	$ 2,468,000	$ 1,724,000	$ 1,900,000	$ 900,000	$ 2,500,000	$ 1,700,000
Unamortized Deferred Stock Based Compensation	4,100,000		4,100,000
Allocated Share-based Compensation Expense							$ 3,800,000

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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