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Cost Method Businesses	6 Months Ended
Cost Method Businesses	Jun. 30, 2016
Investments, All Other Investments [Abstract]
Cost Method Businesses	Cost Method Businesses Actua’s carrying value of its holdings in cost method businesses was $18.6 million as of June 30, 2016 and $18.1 million as of December 31, 2015, as reflected in the line item “Cost method businesses” in Actua’s Consolidated Balance Sheets as of the relevant dates. During the six months ended June 30, 2016, Actua acquired an incremental $0.5 million interest in a cost method business, Parchment Inc. (“Parchment”). 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 six months ended June 30, 2016 or the year ended December 31, 2015.