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Related Party Transaction (CHG Management abd Pacific Oaks Plaza) (Details) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jan. 31, 2013
Chairman and Chief Executive Officer and Another Related Party [Member] | Pacific Oaks Plaza [Member]      
Related Party Transaction [Line Items]      
Ownership percentage of related party (in hundredths) 100.00%netr_OwnershipPercentageOfRelatedParty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= netr_PacificOaksPlazaMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= netr_ChairmanAndChiefExecutiveOfficerAndAnotherRelatedPartyMember
   
Chairman and Chief Executive Officer and Another Related Party [Member] | Pacific Oaks Plaza [Member] | Rent Payments [Member]      
Related Party Transaction [Line Items]      
Revenue from related parties $ 36,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= netr_PacificOaksPlazaMember
/ us-gaap_RelatedPartyTransactionAxis
= netr_RentPaymentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= netr_ChairmanAndChiefExecutiveOfficerAndAnotherRelatedPartyMember
$ 43,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= netr_PacificOaksPlazaMember
/ us-gaap_RelatedPartyTransactionAxis
= netr_RentPaymentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= netr_ChairmanAndChiefExecutiveOfficerAndAnotherRelatedPartyMember
 
CHG Management [Member]      
Related Party Transaction [Line Items]      
Percentage of related party management fee rates charged (in hundredths)     5.00%netr_RelatedPartyManagementFeeRatesCharged
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= netr_ChgManagementMember
Management fees paid   $ 113,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= netr_ChgManagementMember