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Stock Based Compensation (Narrative) (Details) (USD $)
0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Aug. 25, 2014
Mar. 31, 2015
Sep. 02, 2014
Mar. 31, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Minimum exercise price per share of stock options as a percentage of grant date fair market value   100.00%altv_MinimumExercisePricePerShareOfStockOptionsAsPercentageOfGrantDateFairMarketValue      
Stock option or stock appreciation term, maximum   10 years      
Share repurchase program, authorized amount $ 3,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount        
Shares repurchased   902,000us-gaap_TreasuryStockShares     885,000us-gaap_TreasuryStockShares
Shares repurchased, value   8,229,000us-gaap_TreasuryStockValue     8,077,000us-gaap_TreasuryStockValue
August 25, 2014 Share Repurchase Program [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares repurchased   11,057us-gaap_TreasuryStockShares
/ us-gaap_ShareRepurchaseProgramAxis
= altv_August252014ShareRepurchaseProgramMember
     
Shares repurchased, value   0.1us-gaap_TreasuryStockValue
/ us-gaap_ShareRepurchaseProgramAxis
= altv_August252014ShareRepurchaseProgramMember
     
Series A Junior Participating Preferred Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of rights per share     1us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementClassOfStockAxis
= altv_SeriesJuniorParticipatingPreferredStockMember
   
Number of shares per right     0.001us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_StatementClassOfStockAxis
= altv_SeriesJuniorParticipatingPreferredStockMember
   
Preferred shares, par value     $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= altv_SeriesJuniorParticipatingPreferredStockMember
   
Purchase price per share     $ 22.20altv_ClassOfWarrantOrRightExercisePriceOfRights
/ us-gaap_StatementClassOfStockAxis
= altv_SeriesJuniorParticipatingPreferredStockMember
   
Percentage of common stock needed to be acquired for rights to become exercisable     20.00%altv_PercentageOfSharesToBeAcquiredBeforeRightsBecomeExercisable
/ us-gaap_StatementClassOfStockAxis
= altv_SeriesJuniorParticipatingPreferredStockMember
   
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   200,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
  300,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Total fair value of vested restricted stock   600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Total unrecognized stock options compensation expense   $ 900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Weighted average period of recognition for total unrecognized stock options compensation expense   2 years 9 months 15 days      
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Long-Term Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized for plan   1,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= altv_LongTermIncentivePlanMember
     
Shares available for grant   405,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= altv_LongTermIncentivePlanMember
    420,392us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= altv_LongTermIncentivePlanMember
Minimum [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   2 years      
Maximum [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years