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Equity-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2015
Dec. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common stock shares reserved for grant 1,893,678us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant        
SARs, Granted 244,506us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod        
Volume weighted average price targets $28.07, $30.16, $32.38 and $34.71        
VWAP price target declaration (1) on or prior to February 28, 2015, 50% of the shares that would have vested upon achieving the VWAP target will instead vest on the one-year anniversary of the grant, and the remaining 50% of the shares that would have vested upon achieving the VWAP target will instead vest on February 28, 2016        
Consolidated Entities          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock awards vesting period 4 years        
First Anniversary | Consolidated Entities          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
SARs vesting percentage 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
/ us-gaap_VestingAxis
= acta_FirstAnniversaryMember		        
Over Three Years | Consolidated Entities          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock awards vesting period 36 months        
SARs vesting percentage 75.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
/ us-gaap_VestingAxis
= acta_OverThreeYearsMember		        
Each Anniversary | Consolidated Entities          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
SARs vesting percentage 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
/ us-gaap_VestingAxis
= acta_EachAnniversaryMember		        
Minimum | ICG 2014 Performance Plan | Condition One          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of financial targets to be achieved for participants to receive award 100.00%acta_PercentageOfFinancialTargetsToBeAchievedForParticipantsToReceiveAward
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFourteenMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= acta_ConditionOneMember		        
Maximum | ICG 2014 Performance Plan | Condition Two          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of financial targets to be achieved for participants to receive award 100.00%acta_PercentageOfFinancialTargetsToBeAchievedForParticipantsToReceiveAward
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFourteenMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= acta_ConditionTwoMember		        
Stock Options          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock awards vesting period 4 years        
Weighted average remaining contractual life 4 years 3 months 18 days        
Stock Options | Exercise Price One          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock options, exercisable 250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= acta_ExercisePriceOneMember		        
Options, weighted average exercise price 4.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= acta_ExercisePriceOneMember		        
Stock Options | Exercise Price Two          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock options, exercisable 250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= acta_ExercisePriceTwoMember		        
Options, weighted average exercise price 4.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= acta_ExercisePriceTwoMember		        
Stock Options | Exercise Price Three          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock options, exercisable 1,729us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= acta_ExercisePriceThreeMember		        
Options, weighted average exercise price 6.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= acta_ExercisePriceThreeMember		        
Stock Options | First Anniversary          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
SARs vesting percentage 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_VestingAxis
= acta_FirstAnniversaryMember		        
Stock Options | Over Three Years          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock awards vesting period 36 months        
SARs vesting percentage 75.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_VestingAxis
= acta_OverThreeYearsMember		        
Stock Options | Minimum          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock awards vesting period 1 year        
Expiry period of incentive or non-qualified stock options granted from date of grant 8 years        
Stock Options | Maximum          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock awards vesting period 4 years        
Expiry period of incentive or non-qualified stock options granted from date of grant 10 years        
SARs          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock awards vesting period 4 years        
Number of SARs Exercisable 445,238acta_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 966,045acta_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 3,468,805acta_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		    
SARs weighted average base price 10.72acta_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 $ 8.50acta_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 $ 7.53acta_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		    
SARs expected to vest 103,244acta_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		        
SARs, Granted 500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 2,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 260,125us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		    
Number of SARs Outstanding 548,482us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 1,232,808us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 4,338,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		   4,147,391us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of Shares, Vested 679,606us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1] 3,045,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1] 54,873us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1]    
SARs | First Anniversary          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
SARs vesting percentage 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_VestingAxis
= acta_FirstAnniversaryMember		        
SARs | Over Three Years          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock awards vesting period 36 months        
SARs vesting percentage 75.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_VestingAxis
= acta_OverThreeYearsMember		        
Restricted Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
SARs, Granted 3,239,948us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 183,190us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 116,973us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Number of SARs Outstanding 3,755,275us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 1,185,071us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 1,217,463us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		   1,225,785us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Number of Shares, Vested 299,703us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 202,689us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 124,920us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Restricted stock awards, closing price 11.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 10.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 10.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Unrecognized Equity-Based Compensation 32.9us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Equity based compensation expected to be recognized in 2015 16.2acta_EquityBasedCompensationExpectedToBeRecognizedInTwentyFifteen
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Equity based compensation expected to be recognized in 2016 8.1acta_EquityBasedCompensationExpectedToBeRecognizedInTwentySixteen
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Equity based compensation expected to be recognized in 2017 7.4acta_EquityBasedCompensationExpectedToBeRecognizedInTwentySeventeen
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Equity based compensation expected to be recognized in 2018 1.2acta_EquityBasedCompensationExpectedToBeRecognizedInTwentyEighteen
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Restricted stock awards vested 5.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 2.6us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 1.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Shares surrendered for satisfying withholding taxes 93,115us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 46,616us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 39,817us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Outstanding restricted shares expected to vest 3,664,278acta_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVest
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Restricted Stock | Non-Management Directors (Director Plan)          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
SARs, Granted 37,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		 30,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		    
Number of SARs Outstanding 37,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		        
Restricted Stock | ICG 2013 Performance Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
SARs, Granted   130,440us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanMember		      
Percentage of shares of restricted stock to vest upon achievement of performance condition   50.00%acta_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionAwardsDistributedPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanMember		      
Restricted stock awards, closing price   $ 13.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanMember		      
Performance shares vesting conditions   (1) was greater than or equal to 50%, all of that employee’s Performance Shares would have vested or (2) was greater than 0% but less than 50%, a portion of that employee’s Performance Shares equal to two times the achievement percentage would have vested.      
Restricted Stock | ICG 2014 Performance Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
SARs, Granted 158,942us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFourteenMember		        
Percentage of shares of restricted stock to vest upon achievement of performance condition 100.00%acta_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionAwardsDistributedPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFourteenMember		        
Restricted stock awards, closing price 20.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFourteenMember		        
Performance shares vesting conditions (1) is greater than or equal to 100%, all of that employee’s 2014 Performance Shares vest or (2) is greater than 0% but less than 100%, a portion of that employee’s 2014 Performance Shares will vest, as determined by the Compensation Committee of Actua’s Board of Directors.        
Restricted Stock | ICG 2014 Performance Plan | Scenario, Forecast          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of Shares, Vested       158,942us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFourteenMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		  
Restricted Stock | ICG's Chief Executive Officer and ICG's President          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
SARs, Granted 2,782,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_ChiefExecutiveOfficerAndPresidentMember		        
Recorded equity compensation cost related to awards   1.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_ChiefExecutiveOfficerAndPresidentMember		      
Equity compensation cost recognized   0.4us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_ChiefExecutiveOfficerAndPresidentMember		 0.9us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_ChiefExecutiveOfficerAndPresidentMember		   0.2us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_ChiefExecutiveOfficerAndPresidentMember
Number of Shares, Forfeitures 1,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_ChiefExecutiveOfficerAndPresidentMember		        
Restricted Stock | First Vesting          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of SARs Outstanding 1,452,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= acta_FirstVestingMember		        
Stock vesting description 1,452,800 shares of restricted stock vest in equal installments on February 28th of 2015, 2016, 2017 and 2018        
Restricted Stock | First Vesting | ICG's Employees          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of SARs Outstanding 1,496,235us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_EmployeesMember
/ us-gaap_VestingAxis
= acta_FirstVestingMember		        
Stock vesting description 1,496,235 shares of restricted stock vest 25% each year over a four-year period        
Restricted Stock | First Vesting | ICG's Chief Executive Officer and ICG's President          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of SARs Outstanding 91,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_ChiefExecutiveOfficerAndPresidentMember
/ us-gaap_VestingAxis
= acta_FirstVestingMember		        
Stock vesting description 91,666 shares of restricted stock vest in equal installments in May and November 2015        
Restricted Stock | Second Vesting          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of SARs Outstanding 1,327,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= acta_SecondVestingMember		        
Stock vesting description 1,327,700 shares of restricted stock vest based on stipulated market thresholds related to Actua’s Common stock price through February 28, 2018.        
Restricted Stock | Second Vesting | ICG's Employees          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of SARs Outstanding 32,060us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_EmployeesMember
/ us-gaap_VestingAxis
= acta_SecondVestingMember		        
Stock vesting description 32,060 shares of restricted stock vest 12.5% on the nine-month anniversary of the grant date, and the remaining 87.5% every six months subsequent to the first vesting date,        
Restricted Stock | Second Vesting | ICG's Chief Executive Officer and ICG's President          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of SARs Outstanding 366,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_ChiefExecutiveOfficerAndPresidentMember
/ us-gaap_VestingAxis
= acta_SecondVestingMember		        
Stock vesting description 366,666 shares of restricted stock vest based on stipulated market thresholds related to Actua’s Common Stock price through December 31, 2015        
Restricted Stock | Fourth Vesting | ICG's Employees          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of SARs Outstanding 403,448us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_EmployeesMember
/ us-gaap_VestingAxis
= acta_FourthVestingMember		        
Stock vesting description 403,448 shares of restricted stock vest upon the achievement of certain performance goals        
Restricted Stock | Third Vesting | ICG's Employees          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of SARs Outstanding 91,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_EmployeesMember
/ us-gaap_VestingAxis
= acta_ThirdVestingMember		        
Stock vesting description 91,666 shares of restricted stock vest in six-month increments each May and November through November 2015        
Restricted Stock | Third Vesting | ICG's Chief Executive Officer and ICG's President          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of SARs Outstanding 366,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_ChiefExecutiveOfficerAndPresidentMember
/ us-gaap_VestingAxis
= acta_ThirdVestingMember		        
Stock vesting description 366,666 shares of restricted stock vest based on stipulated market thresholds related to Actua’s Common Stock price through December 31, 2015        
Restricted Stock | Fifth Vesting | ICG's Employees          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of SARs Outstanding 1,694,366us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_EmployeesMember
/ us-gaap_VestingAxis
= acta_FifthVestingMember		        
Stock vesting description 1,694,366 shares of restricted stock vest upon the achievement of certain market conditions        
Restricted Stock | Vesting In First Quarter Twenty Fifteen          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
SARs, Granted 100,247us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= acta_VestingInFirstQuarterTwentyFifteenMember		        
Number of SARs Outstanding 56,587us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= acta_VestingInFirstQuarterTwentyFifteenMember		        
Restricted Stock | Vesting In First Quarter Twenty Sixteen          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
SARs, Granted 144,259us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= acta_VestingInFirstQuarterTwentySixteenMember		        
Number of SARs Outstanding 97,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= acta_VestingInFirstQuarterTwentySixteenMember		        
Restricted Stock | Minimum | ICG 2013 Performance Plan | Condition One          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of financial targets to be achieved for participants to receive award   50.00%acta_PercentageOfFinancialTargetsToBeAchievedForParticipantsToReceiveAward
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= acta_ConditionOneMember		      
Restricted Stock | Maximum | ICG 2013 Performance Plan | Condition Two          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of financial targets to be achieved for participants to receive award   50.00%acta_PercentageOfFinancialTargetsToBeAchievedForParticipantsToReceiveAward
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= acta_ConditionTwoMember		      
Deferred Stock Units | Selling, General and Administrative Expenses          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Expense associated with these DSUs 0.3us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 $ 0.4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 $ 0.4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		    
Deferred Stock Units | Non-Management Directors (Director Plan)          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of SARs Outstanding 22,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		        
[1] The exercise of SARs listed in this table resulted in the issuance of 253,853 shares, 992,390 shares and 9,818 shares of Actua’s Common Stock during the years ended December 31, 2014, 2013 and 2012, respectively.