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Separate Financial Statements of Subsidiary not Consolidated - Bolt (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Equity Method Investments [Line Items]      
Total Assets $ 5,504us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets [1] $ 8,310us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets [2]  
Revenue 8,763us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue [3] 48,316us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue [4] 89,958us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Net loss (1,110)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss [3] (9,238)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss [4] (20,159)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
Bolt      
Schedule Of Equity Method Investments [Line Items]      
Total Assets     11,705us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_BusinessAcquisitionAxis
= acta_BoltMember
Total Liabilities     16,759us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_BusinessAcquisitionAxis
= acta_BoltMember
Total Stockholders' Equity     (5,054)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_BusinessAcquisitionAxis
= acta_BoltMember
Revenue     6,518us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_BusinessAcquisitionAxis
= acta_BoltMember
Expenses     (18,245)acta_EquityMethodInvestmentSummarizedFinancialInformationExpenses
/ us-gaap_BusinessAcquisitionAxis
= acta_BoltMember
Net loss     $ (11,727)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= acta_BoltMember
[1] Includes (Actua voting ownership): Acquirgy (25%) and CIML (38%).
[2] Includes (Actua voting ownership): Acquirgy (25%).
[3] Includes Acquirgy and CIML (through September 30, 2014, the date of disposition).
[4] Includes Acquirgy, CIML, Freeborders (through October 18, 2013, the date of disposition) and WhiteFence (through October 28, 2013, the date of disposition).