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Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Customer
Mar. 31, 2014
Customer
Significant Accounting Policies [Line Items]    
Expiry period of contingent gains associated with outstanding escrows 2016  
Actua's Consolidated Revenue    
Significant Accounting Policies [Line Items]    
Number of customers represented for more than 10% of consolidated revenue 0acta_NumberOfCustomers
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember		 0acta_NumberOfCustomers
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
Channel Intelligence    
Significant Accounting Policies [Line Items]    
Proceeds from escrow releases 4.0us-gaap_EscrowDeposit
/ dei_LegalEntityAxis
= acta_ChannelIntelligenceMember		  
MSDSonline One    
Significant Accounting Policies [Line Items]    
Number of sources of revenues 2acta_NumberOfSourcesOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= acta_MsdsonlineOneMember		  
Maintenance and customer support fees, contract life 1 year  
FolioDynamix    
Significant Accounting Policies [Line Items]    
Initial subscription arrangement, Minimum 3 years  
Initial subscription arrangement, Maximum 5 years