The Company	12 Months Ended
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
The Company	The Company Description of the Company Actua Corporation (together with its subsidiaries, "Actua"), which was formed on March 4, 1996, is a multi-vertical cloud technology company with offerings that it believes create unique and compelling value for its customers and provide transformative efficiency to vertical markets worldwide. As of December 31, 2016, Actua owned three businesses, each of which addresses the needs of a specific vertical market or industry: BOLT Solutions, Inc. ("Bolt"), FolioDynamics Holdings, Inc. ("FolioDynamix") and VelocityEHS Holdings, Inc. ("VelocityEHS"). Basis of Presentation On October 18, 2016, the sale of GovDelivery Holdings, Inc. ("GovDelivery") to affiliates of Vista Equity Partners ("Vista") (such transaction, the "GovDelivery Sale") was consummated. Accordingly, the financial results and financial position of GovDelivery are presented as discontinued operations in the Consolidated Financial Statements for all periods presented. The Consolidated Financial Statements contained herein (the "Consolidated Financial Statements") include the accounts of Actua Corporation and its wholly-owned subsidiaries and majority-owned subsidiaries. The results of FolioDynamix are included in the Consolidated Financial Statements from the date Actua acquired it, November 3, 2014.

The Company

12 Months Ended

Dec. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of the Company

Actua Corporation (together with its subsidiaries, "Actua"), which was formed on March 4, 1996, is a multi-vertical cloud technology company with offerings that it believes create unique and compelling value for its customers and provide transformative efficiency to vertical markets worldwide. As of December 31, 2016, Actua owned three businesses, each of which addresses the needs of a specific vertical market or industry: BOLT Solutions, Inc. ("Bolt"), FolioDynamics Holdings, Inc. ("FolioDynamix") and VelocityEHS Holdings, Inc. ("VelocityEHS").

Basis of Presentation

On October 18, 2016, the sale of GovDelivery Holdings, Inc. ("GovDelivery") to affiliates of Vista Equity Partners ("Vista") (such transaction, the "GovDelivery Sale") was consummated. Accordingly, the financial results and financial position of GovDelivery are presented as discontinued operations in the Consolidated Financial Statements for all periods presented.

The Consolidated Financial Statements contained herein (the "Consolidated Financial Statements") include the accounts of Actua Corporation and its wholly-owned subsidiaries and majority-owned subsidiaries. The results of FolioDynamix are included in the Consolidated Financial Statements from the date Actua acquired it, November 3, 2014.