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Stock-Based Compensation Expense (Detail) (USD $)	3 Months Ended		9 Months Ended
Stock-Based Compensation Expense (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,665,000	$ 1,964,000	$ 4,552,000	$ 6,434,000
Product and content development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	536,000	658,000	1,711,000	2,134,000
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	362,000	574,000	1,179,000	1,987,000
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 767,000	$ 732,000	$ 1,662,000	$ 2,313,000

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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