Treasury Stock	3 Months Ended
Mar. 31, 2017
Equity [Abstract]
Treasury Stock	Treasury Stock Actua has been authorized by its Board of Directors (the "Board"), pursuant to a share repurchase program to repurchase, from time to time, shares of Common Stock in open market transactions, including pursuant to trading plans meeting the requirements of Rule 10b5-1 under the Exchange Act, in privately negotiated transactions or pursuant to one or more issuer tender offers. The program was adopted in 2008 and expanded in 2013 to allow for the repurchase of up to $150.0 million of shares of Actua's Common Stock. During the year ended December 31, 2016, the program was further expanded to allow for an additional $39.8 million of repurchases, increasing the total repurchase amount to $189.8 million, of which $43.4 million is available as of May 3, 2017. During the three months ended March 31, 2017, Actua repurchased 895,787 shares of its Common Stock for $12.5 million at an average stock price of $13.92 per share. During the three months ended March 31, 2017, Actua paid $11.5 million for these repurchases and accrued $1.0 million for the share repurchases not yet settled. During the three months ended March 31, 2016, Actua repurchased 470,000 shares of its Common Stock at an average stock price of $9.15 per share. During the three months ended March 31, 2016, Actua paid $4.0 million for these repurchases and accrued $0.3 million for the share repurchases not yet settled. From commencement of the program through May 3, 2017, Actua has deployed a total of $146.4 million to repurchase a total of 12,834,734 shares of Common Stock for an average purchase price of $11.41 per share. Repurchases are reflected in the line item "Treasury stock, at cost" as a reduction of stockholders’ equity in Actua’s Consolidated Balance Sheets in the relevant period.

Treasury Stock

Actua has been authorized by its Board of Directors (the "Board"), pursuant to a share repurchase program to repurchase, from time to time, shares of Common Stock in open market transactions, including pursuant to trading plans meeting the requirements of Rule 10b5-1 under the Exchange Act, in privately negotiated transactions or pursuant to one or more issuer tender offers. The program was adopted in 2008 and expanded in 2013 to allow for the repurchase of up to $150.0 million of shares of Actua's Common Stock. During the year ended December 31, 2016, the program was further expanded to allow for an additional $39.8 million of repurchases, increasing the total repurchase amount to $189.8 million, of which $43.4 million is available as of May 3, 2017. During the three months ended March 31, 2017, Actua repurchased 895,787 shares of its Common Stock for $12.5 million at an average stock price of $13.92 per share. During the three months ended March 31, 2017, Actua paid $11.5 million for these repurchases and accrued $1.0 million for the share repurchases not yet settled. During the three months ended March 31, 2016, Actua repurchased 470,000 shares of its Common Stock at an average stock price of $9.15 per share. During the three months ended March 31, 2016, Actua paid $4.0 million for these repurchases and accrued $0.3 million for the share repurchases not yet settled. From commencement of the program through May 3, 2017, Actua has deployed a total of $146.4 million to repurchase a total of 12,834,734 shares of Common Stock for an average purchase price of $11.41 per share. Repurchases are reflected in the line item "Treasury stock, at cost" as a reduction of stockholders’ equity in Actua’s Consolidated Balance Sheets in the relevant period.