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Allocations of Purchase Price to Identified Intangible Assets and Tangible Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Net assets acquired:    
Goodwill $ 264,943us-gaap_Goodwill $ 264,943us-gaap_Goodwill
KMI    
Net assets acquired:    
Goodwill 6,735us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= acta_KnowledgeManagementInnovationsMember
 
Other net assets (liabilities) 1,165acta_BusinessAcquisitionPurchasePriceAllocationOtherNetAssetsLiabilities
/ us-gaap_BusinessAcquisitionAxis
= acta_KnowledgeManagementInnovationsMember
 
Purchase price allocation assets acquired 11,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= acta_KnowledgeManagementInnovationsMember
 
KMI | Customer lists    
Net assets acquired:    
Intangible assets 2,900us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= acta_KnowledgeManagementInnovationsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
 
KMI | Trademarks/trade names    
Net assets acquired:    
Intangible assets 300us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= acta_KnowledgeManagementInnovationsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
 
KMI | Technology    
Net assets acquired:    
Intangible assets 400us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= acta_KnowledgeManagementInnovationsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
 
Ludwig    
Net assets acquired:    
Goodwill 314us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= acta_LudwigMember
 
Purchase price allocation assets acquired 3,136us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= acta_LudwigMember
 
Ludwig | Customer lists    
Net assets acquired:    
Intangible assets 2,658us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= acta_LudwigMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
 
Ludwig | Non-compete agreements    
Net assets acquired:    
Intangible assets 164us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= acta_LudwigMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
 
NuCivic    
Net assets acquired:    
Goodwill 1,257us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= acta_NuCivicMember
 
Other net assets (liabilities) 197acta_BusinessAcquisitionPurchasePriceAllocationOtherNetAssetsLiabilities
/ us-gaap_BusinessAcquisitionAxis
= acta_NuCivicMember
 
Purchase price allocation assets acquired 2,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= acta_NuCivicMember
 
NuCivic | Customer lists    
Net assets acquired:    
Intangible assets 202us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= acta_NuCivicMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
 
NuCivic | Trademarks/trade names    
Net assets acquired:    
Intangible assets 330us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= acta_NuCivicMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
 
NuCivic | Non-compete agreements    
Net assets acquired:    
Intangible assets $ 14us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= acta_NuCivicMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember