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Cost Method Businesses	3 Months Ended
Cost Method Businesses	Mar. 31, 2017
Investments, All Other Investments [Abstract]
Cost Method Businesses	Cost Method Businesses Actua’s carrying value of its holdings in cost method businesses was $17.3 million as of both March 31, 2017 and December 31, 2016, as reflected in the line item "Cost method businesses" in Actua’s Consolidated Balance Sheets as of the relevant dates. Impairments Actua performs ongoing business reviews of its cost method businesses to determine whether Actua’s carrying value in those businesses is impaired. Actua determined its carrying value in its cost method businesses was not impaired during the three months ended March 31, 2017 or the year ended December 31, 2016.