Discontinued Operations - Schedule of Disposal Groups (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2013 USD ($)
Investor Force
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue (through date of respective sale)	$ 800
Actua Corporation’s share of net income (loss) (through date of respective sale)	(500)
Channel Intelligence
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue (through date of respective sale)	3,100
Actua Corporation’s share of net income (loss) (through date of respective sale)	(2,900)
Procurian
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue (through date of respective sale)	127,100
Actua Corporation’s share of net income (loss) (through date of respective sale)	$ 100