Business Acquisition (Details) (USD $)	9 Months Ended		3 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 IGN Entertainment, Inc [Member]	Jun. 30, 2013 IGN Entertainment, Inc [Member]	Sep. 30, 2013 Ziff Davis, Inc [Member]
Goodwill, Period Increase (Decrease)			$ 1,800,000	$ 3,800,000	$ 1,700,000
Goodwill, Acquired During Period	31,420,000
Goodwill	441,687,000	407,825,000
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount	15,700,000
Business Acquisition Contributed Total Revenue	50,300,000
Total consideration of transaction, net of cash acquired	114,000,000
Business Combination, Consideration Transferred, Liabilities Incurred	$ 15,200,000