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Equity-Based Compensation - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 15 Months Ended
Mar. 31, 2015
Dec. 31, 2013
Mar. 31, 2014
Dec. 31, 2011
Apr. 30, 2014
Apr. 13, 2011
Mar. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of SARs Outstanding 3,508,624us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber           3,508,624us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber  
Volume weighted average price targets 28.07, $30.16, $32.38 and $34.71              
VWAP price target declaration prior to February 28, 2016, half of the applicable shares will vest on the date of achievement of the VWAP target, and the remaining half of the shares that would have vested upon achieving the VWAP target will instead vest on February 28, 2016.              
Unrecognized Equity-Based Compensation $ 42,705,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized           $ 42,705,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
NuCivic                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock awards vesting period 4 years              
SARs, Granted 3,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_BusinessAcquisitionAxis
= acta_NuCivicMember		              
Consolidated Entities                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock awards vesting period 4 years              
Common Stock                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of shares awarded 20,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		              
Share based compensation expense 300,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		              
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		              
First Vesting                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of SARs Outstanding 1,714,366us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_VestingAxis
= acta_FirstVestingMember		           1,714,366us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_VestingAxis
= acta_FirstVestingMember		  
Vesting Conditions Subject to certain market conditions, as discussed below              
Second Vesting                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of SARs Outstanding 503,315us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_VestingAxis
= acta_SecondVestingMember		           503,315us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_VestingAxis
= acta_SecondVestingMember		  
Vesting Conditions Subject to certain performance conditions, as discussed below              
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		              
2011 Executive Performance-Based Awards                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of SARs Outstanding       366,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= acta_TwoThousandElevenExecutivePerformanceBasedAwardsMember		        
Recorded equity compensation cost related to awards   1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
/ us-gaap_PlanNameAxis
= acta_TwoThousandElevenExecutivePerformanceBasedAwardsMember		            
Non-Management Director Compensation Plan                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Weighted average price per share     $ 13.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		          
Weighted Average Fair Value, Granted     $ 17.63us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		          
Stock Options                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock awards vesting period 4 years              
Stock options outstanding 250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		           250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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              
Restricted Stock Award                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of SARs Outstanding 3,508,624us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= acta_RestrictedStockAwardMember		           3,508,624us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= acta_RestrictedStockAwardMember		 3,755,275us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= acta_RestrictedStockAwardMember
Restricted Stock                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
SARs, Granted 441,256us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		   3,095,948us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		          
Weighted average price per share $ 19.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		   $ 12.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		          
Unrecognized Equity-Based Compensation 37,632,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		           37,632,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		  
Number of Shares, Vested 644,247us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		   175,771us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		          
Number of Shares, Forfeited 43,660us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		   366,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		          
Weighted Average Fair Value, Granted $ 16.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		   $ 17.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		          
Restricted Stock | Vest on various anniversaries                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of SARs Outstanding 43,435us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= acta_VariousVestingAnniversariesMember		           43,435us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= acta_VariousVestingAnniversariesMember		  
Restricted Stock | Chief Executive Officer And 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		           91,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_ChiefExecutiveOfficerAndPresidentMember		  
Restricted Stock | Executives                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock awards vesting period 4 years              
SARs, Granted 20,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		              
Restricted Stock | Employees including Executive officers                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
SARs, Granted     1,377,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_EmployeesAndExecutiveOfficersMember		          
Equity based compensation expected to be recognized remainder of year 5,200,000acta_EquityBasedCompensationExpectedToBeRecognizedRemainderOfYear
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_EmployeesAndExecutiveOfficersMember		              
Equity based compensation expected to be recognized in 2016 7,000,000acta_EquityBasedCompensationExpectedToBeRecognizedInTwentySixteen
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_EmployeesAndExecutiveOfficersMember		              
Number of Shares, Vested 344,375us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_EmployeesAndExecutiveOfficersMember		              
Unrecognized Equity-based compensation 20,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_EmployeesAndExecutiveOfficersMember		           20,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_EmployeesAndExecutiveOfficersMember		  
Equity based compensation expected to be recognized in 2017 7,000,000acta_EquityBasedCompensationExpectedToBeRecognizedInTwentySeventeen
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_EmployeesAndExecutiveOfficersMember		              
Equity based compensation expected to be recognized in 2018 1,200,000acta_EquityBasedCompensationExpectedToBeRecognizedInTwentyEighteen
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_EmployeesAndExecutiveOfficersMember		              
Restricted Stock | Non-Management Employees                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock awards vesting period 4 years              
SARs, Granted 4,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_NonManagementEmployeesMember		              
Restricted Stock | Employees                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of SARs Outstanding 24,042us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_EmployeesMember		           24,042us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acta_EmployeesMember		  
Restricted Stock | Awards with Market Conditions | Chief Executive Officer And President                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
SARs, Granted       366,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_AwardsWithMarketConditionsMember
/ us-gaap_TitleOfIndividualAxis
= acta_ChiefExecutiveOfficerAndPresidentMember		        
Percentage of shares of restricted stock to vest upon achievement of performance condition       40.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_AwardsWithMarketConditionsMember
/ us-gaap_TitleOfIndividualAxis
= acta_ChiefExecutiveOfficerAndPresidentMember		        
Restricted Stock | 2014 Management Market-Based Awards                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of SARs Outstanding     1,277,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_TwoThousandFourteenManagementMarketBasedAwardsMember		          
Unrecognized Equity-Based Compensation 6,800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_TwoThousandFourteenManagementMarketBasedAwardsMember		           6,800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_TwoThousandFourteenManagementMarketBasedAwardsMember		  
Equity based compensation expected to be recognized remainder of year 6,100,000acta_EquityBasedCompensationExpectedToBeRecognizedRemainderOfYear
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_TwoThousandFourteenManagementMarketBasedAwardsMember		              
Equity based compensation expected to be recognized in 2016 700,000acta_EquityBasedCompensationExpectedToBeRecognizedInTwentySixteen
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_TwoThousandFourteenManagementMarketBasedAwardsMember		              
Restricted Stock | 2014 Employee Market-Based Awards                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
SARs, Granted         50,200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_TwoThousandFourteenEmployeeMarketBasedAwardsMember		      
Restricted Stock | 2014 Management and Employee Market Based Awards.                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
SARs, Granted 20,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_TwoThousandFourteenManagementAndEmployeeMarketBasedAwardsMember		              
Restricted Stock | Performance metrics of Gov Delivery for 2014 and 2015                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
SARs, Granted     244,506us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceMetricsOfGovDeliveryMember		          
Number of Shares, Vested     56,587us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceMetricsOfGovDeliveryMember		          
Number of Shares, Forfeited     43,660us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceMetricsOfGovDeliveryMember		          
Restricted Stock | Performance metrics of Gov Delivery for 2014 and 2015 | 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_PlanNameAxis
= acta_PerformanceMetricsOfGovDeliveryMember
/ us-gaap_VestingAxis
= acta_VestingInFirstQuarterTwentyFifteenMember		          
Restricted Stock | Performance metrics of Gov Delivery for 2014 and 2015 | 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_PlanNameAxis
= acta_PerformanceMetricsOfGovDeliveryMember
/ us-gaap_VestingAxis
= acta_VestingInFirstQuarterTwentySixteenMember		          
Restricted Stock | Performance Based Plan Two Thousand Fourteen                
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		              
Weighted average price per share $ 20.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFourteenMember		              
Percentage of shares of restricted stock to vest upon achievement of performance condition     10000.00%acta_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionAwardsDistributedPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFourteenMember		          
Vesting Conditions (1) was greater than or equal to 100%, all of the employee’s 2014 Performance Shares would have vested or (2) was greater than 0% but less than 100%, a portion of that employee’s 2014 Performance Shares would have vested, as determined by the Compensation Committee of Actua’s Board of Directors              
Restricted Stock | Performance Based Plan Two Thousand Fifteen                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
SARs, Granted 316,715us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFifteenMember		              
Weighted average price per share $ 16.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFifteenMember		              
Percentage of shares of restricted stock to vest upon achievement of performance condition 15000.00%acta_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionAwardsDistributedPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFifteenMember		           15000.00%acta_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionAwardsDistributedPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFifteenMember		  
Vesting Conditions (1) is greater than or equal to 150%, all of that employee’s 2015 Performance Shares will vest or (2) is greater than 0% but less than 150%, a portion of that employee’s 2015 Performance Shares will vest              
Restricted Stock | Performance Based Plan | Executives                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
SARs, Granted 42,341us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		              
Restricted Stock | Non-Management Director Compensation Plan                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock awards vesting period           6 months    
SARs, Granted     37,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		     18,200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		    
Number of Shares, Vested 37,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		              
Number of Shares, Granted and vested     30,750acta_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		          
Restricted Stock | Non-Management Director Compensation Plan | Board of Directors                
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
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		          
Restricted Stock | Time-based awards | Non-Management Employees                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock awards vesting period         4 years      
SARs, Granted 18,825us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_TimeBasedAwardsMember
/ us-gaap_TitleOfIndividualAxis
= acta_NonManagementEmployeesMember		       76,200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_TimeBasedAwardsMember
/ us-gaap_TitleOfIndividualAxis
= acta_NonManagementEmployeesMember		      
Number of Shares, Forfeited     900us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_TimeBasedAwardsMember
/ us-gaap_TitleOfIndividualAxis
= acta_NonManagementEmployeesMember		          
Restricted Stock | Second Amended and Restated Non-Management Director Compensation Plan (the “Amended Director Plan”)                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of SARs Outstanding 18,200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_SecondAmendedAndRestatedNonManagementDirectorCompensationPlanMember		           18,200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_SecondAmendedAndRestatedNonManagementDirectorCompensationPlanMember		  
Restricted Stock | Minimum | Performance Based Plan Two Thousand Fourteen | 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_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFourteenMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= acta_ConditionOneMember		              
Restricted Stock | Minimum | Performance Based Plan Two Thousand Fifteen                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Percentage of financial targets to be achieved for participants to receive award 150.00%acta_PercentageOfFinancialTargetsToBeAchievedForParticipantsToReceiveAward
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFifteenMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		              
Restricted Stock | Maximum | Awards with Market Conditions | Chief Executive Officer And President                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Weighted average price per share       25.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_AwardsWithMarketConditionsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= acta_ChiefExecutiveOfficerAndPresidentMember		        
Restricted Stock | Maximum | Performance Based Plan Two Thousand Fourteen | 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_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFourteenMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= acta_ConditionTwoMember		              
Restricted Stock | Maximum | Performance Based Plan Two Thousand Fifteen                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Percentage of financial targets to be achieved for participants to receive award 150.00%acta_PercentageOfFinancialTargetsToBeAchievedForParticipantsToReceiveAward
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= acta_PerformanceBasedPlanTwoThousandFifteenMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		              
SARs                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
SARs, Granted 1,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		           500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		  
Unrecognized Equity-Based Compensation 386,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		           386,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		  
Number of Shares, Vested 7,897us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1]   293,925us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1]          
SARs outstanding 542,085us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		           542,085us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 548,482us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Aggregate intrinsic value of SARs outstanding $ 4,200,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		           $ 4,200,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 4,300,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Weighted Average Fair Value, Granted $ 8.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		              
Deferred Stock Units                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Change of non-management director service grant shares           22,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember		    
Deferred Stock Units | Second Vesting                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of Shares, Vested           15,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember
/ us-gaap_VestingAxis
= acta_SecondVestingMember		    
Deferred Stock Units | Non-Management Director Compensation Plan                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of SARs Outstanding 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		           0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		 22,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember
SARs, Granted     22,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		          
Number of Shares, Vested 22,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		              
Number of Shares, Granted and vested     29,250acta_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndVestedInPeriod
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		          
Stock issued for services 4,469us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		   5,913us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= acta_NonManagementDirectorsDirectorPlanMember		          
Deferred Stock Units | Prior Director Plan                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Change of non-management director service grant shares           7,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= acta_PriorDirectorPlanMember		    
Deferred Stock Units | Prior Director Plan | First Vesting                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of Shares, Vested           7,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= acta_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= acta_PriorDirectorPlanMember
/ us-gaap_VestingAxis
= acta_FirstVestingMember		    
[1] The exercise of SARs listed in the three-month period table resulted in the issuance of 1,869 shares and 120,459 shares of Actua’s Common Stock during the three months ended March 31, 2015 and 2014, respectively.