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Summary of Intangible Assets from Continuing Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Acquired Finite And Indefinite Lived Assets Liabilities [Line Items]    
Finite intangible assets, Gross Carrying Amount 128,394us-gaap_FiniteLivedIntangibleAssetsGross 128,394us-gaap_FiniteLivedIntangibleAssetsGross
Finite intangible assets, Accumulated Amortization (30,785)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (26,769)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Finite intangible assets, Net Carrying Amount 97,609us-gaap_FiniteLivedIntangibleAssetsNet 101,625us-gaap_FiniteLivedIntangibleAssetsNet
Intangible assets gross excluding goodwill 129,094us-gaap_IntangibleAssetsGrossExcludingGoodwill 129,094us-gaap_IntangibleAssetsGrossExcludingGoodwill
Intangible assets, net 98,309us-gaap_IntangibleAssetsNetExcludingGoodwill 102,325us-gaap_IntangibleAssetsNetExcludingGoodwill
Other Intellectual Property    
Acquired Finite And Indefinite Lived Assets Liabilities [Line Items]    
Indefinite intangible assets, Net Carrying Amount 700us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= acta_OtherIntellectualPropertyMember		 [1]  
Customer Relationships    
Acquired Finite And Indefinite Lived Assets Liabilities [Line Items]    
Finite intangible assets, Gross Carrying Amount 74,948us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 74,948us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Finite intangible assets, Accumulated Amortization (16,889)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 (14,817)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Finite intangible assets, Net Carrying Amount 58,059us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 60,131us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Customer Relationships | Minimum    
Acquired Finite And Indefinite Lived Assets Liabilities [Line Items]    
Finite intangible assets, useful life 1 year 1 year
Customer Relationships | Maximum    
Acquired Finite And Indefinite Lived Assets Liabilities [Line Items]    
Finite intangible assets, useful life 11 years 11 years
Trademarks/trade names    
Acquired Finite And Indefinite Lived Assets Liabilities [Line Items]    
Finite intangible assets, Gross Carrying Amount 24,543us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember		 24,543us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Finite intangible assets, Accumulated Amortization (5,177)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember		 (4,322)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Finite intangible assets, Net Carrying Amount 19,366us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember		 20,221us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Trademarks/trade names | Minimum    
Acquired Finite And Indefinite Lived Assets Liabilities [Line Items]    
Finite intangible assets, useful life 3 years 3 years
Trademarks/trade names | Maximum    
Acquired Finite And Indefinite Lived Assets Liabilities [Line Items]    
Finite intangible assets, useful life 11 years 11 years
Technology    
Acquired Finite And Indefinite Lived Assets Liabilities [Line Items]    
Finite intangible assets, Gross Carrying Amount 25,223us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 25,223us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Finite intangible assets, Accumulated Amortization (5,198)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 (4,263)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Finite intangible assets, Net Carrying Amount 20,025us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 20,960us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Technology | Minimum    
Acquired Finite And Indefinite Lived Assets Liabilities [Line Items]    
Finite intangible assets, useful life 5 years 5 years
Technology | Maximum    
Acquired Finite And Indefinite Lived Assets Liabilities [Line Items]    
Finite intangible assets, useful life 10 years 10 years
Non-compete agreements    
Acquired Finite And Indefinite Lived Assets Liabilities [Line Items]    
Finite intangible assets, Gross Carrying Amount 3,680us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember		 3,680us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Finite intangible assets, Accumulated Amortization (3,521)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember		 (3,367)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Finite intangible assets, Net Carrying Amount 159us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember		 313us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Non-compete agreements | Minimum    
Acquired Finite And Indefinite Lived Assets Liabilities [Line Items]    
Finite intangible assets, useful life 2 years 2 years
Non-compete agreements | Maximum    
Acquired Finite And Indefinite Lived Assets Liabilities [Line Items]    
Finite intangible assets, useful life 5 years 5 years
[1] One of the assets included in this line item is no longer considered to have an indefinite life following Actua’s name change on September 2, 2014. However, Actua estimated that the residual value of this asset approximated its carrying value of $0.4 million as of both March 31, 2015 and December 31, 2014.