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Stock Based Compensation (Narrative) (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended
Aug. 25, 2014
Dec. 31, 2014
Dec. 31, 2013
Sep. 02, 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    
Stock-based compensation expense   $ 767,000us-gaap_AllocatedShareBasedCompensationExpense $ 1,457,000us-gaap_AllocatedShareBasedCompensationExpense  
Intrinsic value of options exercised   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue  
Share repurchase program, authorized amount 3,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount      
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense   800,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
1,400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Vesting period   3 years    
Total fair value of vested restricted stock   1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense   100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Vesting period   3 years    
Total fair value of vested restricted stock   1,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Total unrecognized stock options compensation expense   700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Weighted average period of recognition for total unrecognized stock options compensation expense   1 year 8 months 27 days    
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 avaliable for grant   420,392us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= altv_LongTermIncentivePlanMember
57,923us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= altv_LongTermIncentivePlanMember
 
Shareholder Rights Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Preferred shares, par value       $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_PlanNameAxis
= altv_ShareholderRightsPlanMember
Shares Issued, Price Per Share       $ 22.20us-gaap_SharesIssuedPricePerShare
/ us-gaap_PlanNameAxis
= altv_ShareholderRightsPlanMember
Percent of common stock       20.00%altv_PercentageOfCommonStock
/ us-gaap_PlanNameAxis
= altv_ShareholderRightsPlanMember
Share Repurchase Program [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Repurchased During Period, Shares   9,600us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_PlanNameAxis
= altv_ShareRepurchaseProgramMember
   
Stock Repurchased During Period, Value   $ 100,000us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_PlanNameAxis
= altv_ShareRepurchaseProgramMember
   
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