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FAIR VALUE MEASUREMENTS (Details) (USD $)
6 Months Ended 12 Months Ended
Apr. 30, 2015
Oct. 31, 2014
Oct. 31, 2013
Redeemable Noncontrolling Interest [Line Items]      
Increase in redemption value of noncontrolling interest $ (1,525,000)us-gaap_MinorityInterestChangeInRedemptionValue $ 887,000us-gaap_MinorityInterestChangeInRedemptionValue  
Initial McLean Plaza noncontrolling Interests (615,000)uba_InitialValueOfNonControllingInterestForNewInvestment 6,134,000uba_InitialValueOfNonControllingInterestForNewInvestment  
Estimated fair value of mortgage notes payable and other loans 268,000,000us-gaap_DebtInstrumentFairValue 205,000,000us-gaap_DebtInstrumentFairValue  
UB Ironbound, LP ("Ironbound") [Member]      
Redeemable Noncontrolling Interest [Line Items]      
Increase in redemption value of noncontrolling interest 40,000us-gaap_MinorityInterestChangeInRedemptionValue
/ dei_LegalEntityAxis
= uba_UbIronboundLpIronboundMember
30,000us-gaap_MinorityInterestChangeInRedemptionValue
/ dei_LegalEntityAxis
= uba_UbIronboundLpIronboundMember
 
Initial McLean Plaza noncontrolling Interests   6,134,000uba_InitialValueOfNonControllingInterestForNewInvestment
/ dei_LegalEntityAxis
= uba_UbIronboundLpIronboundMember
 
Fair Value, Inputs, Level 1 [Member]      
Assets [Abstract]      
Interest Rate Swap Agreement   0us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Liabilities [Abstract]      
Redeemable noncontrolling interests   9,802,000us-gaap_RedeemableNoncontrollingInterestEquityFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Fair Value, Inputs, Level 2 [Member]      
Assets [Abstract]      
Interest Rate Swap Agreement   63,000us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Liabilities [Abstract]      
Redeemable noncontrolling interests   0us-gaap_RedeemableNoncontrollingInterestEquityFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Fair Value, Inputs, Level 3 [Member]      
Assets [Abstract]      
Interest Rate Swap Agreement   0us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
 
Liabilities [Abstract]      
Redeemable noncontrolling interests   9,062,000us-gaap_RedeemableNoncontrollingInterestEquityFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
 
Fair Value, Measurements, Recurring [Member]      
Assets [Abstract]      
Interest Rate Swap Agreement   63,000us-gaap_DerivativeAssets
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Liabilities [Abstract]      
Interest Rate Swap Agreement 1,108,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Redeemable noncontrolling interests 16,724,000us-gaap_RedeemableNoncontrollingInterestEquityFairValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
18,864,000us-gaap_RedeemableNoncontrollingInterestEquityFairValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Liabilities [Abstract]      
Interest Rate Swap Agreement 0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Redeemable noncontrolling interests 13,836,000us-gaap_RedeemableNoncontrollingInterestEquityFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Liabilities [Abstract]      
Interest Rate Swap Agreement 1,108,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Redeemable noncontrolling interests 0us-gaap_RedeemableNoncontrollingInterestEquityFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Liabilities [Abstract]      
Interest Rate Swap Agreement 0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Redeemable noncontrolling interests $ 2,888,000us-gaap_RedeemableNoncontrollingInterestEquityFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
  $ 2,897,000us-gaap_RedeemableNoncontrollingInterestEquityFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember