Stock-Based Compensation Expense Recognized in the Consolidated Statements of Operations (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Component of Operating Other Cost and Expense [Line Items]
Stock-based compensation expense	$ 7,800,000	$ 6,800,000	$ 16,993,000	$ 16,034,000
Cost of services and product development
Component of Operating Other Cost and Expense [Line Items]
Stock-based compensation expense	3,400,000	3,100,000	7,900,000	7,800,000
Selling, general and administrative
Component of Operating Other Cost and Expense [Line Items]
Stock-based compensation expense	$ 4,400,000	$ 3,700,000	$ 9,100,000	$ 8,200,000