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Organization and Significant Accounting Policies - Additional Information (Detail) (USD $)
0 Months Ended 12 Months Ended
Aug. 01, 2013
Feb. 22, 1990
Dec. 31, 2014
State
Property
Tenants
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 1987
Jan. 23, 1989
Organization And Significant Accounting Policies [Line Items]              
Aggregate capital contributions           $ 300us-gaap_PartnersCapitalAccountContributions  
Limited Partnership Interests outstanding   46,280.3us-gaap_PartnersCapitalAccountUnitsSaleOfUnits          
Net of underwriting compensation and other offering costs     39,358,468us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts        
Number of Properties available to be leased     11us-gaap_NumberOfRealEstateProperties        
Number of states Partnership Property Located     4us-gaap_NumberOfStatesInWhichEntityOperates        
Allowance for doubtful accounts     25,483us-gaap_AllowanceForDoubtfulAccountsReceivable 0us-gaap_AllowanceForDoubtfulAccountsReceivable      
Accumulated amortization     157,456us-gaap_AmortizationOfDeferredCharges 129,795us-gaap_AmortizationOfDeferredCharges      
Amortized deferred charges written off     83,292zzdd_AmortizedDeferredChargesWrittenOff        
Deferred tenant award proceeds escrow, payment period 99 months            
Number of partnership's Properties leased to significant tenants     9zzdd_NumberOfPartnershipsPropertiesLeasedToSignificantTenants        
Number of significant tenants     3zzdd_NumberOfSignificantTenants        
Estimated fair value         293,000us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure    
Property impairment write-(up) down     0us-gaap_ImpairmentOfRealEstate 0us-gaap_ImpairmentOfRealEstate (142,747)us-gaap_ImpairmentOfRealEstate    
Adjustments to carrying values     0zzdd_AdjustmentsToCarryingValues 0zzdd_AdjustmentsToCarryingValues      
Federal income taxes     0zzdd_FederalIncomeTaxes        
Excess of tax basis of the Partnership's assets     6,861,581zzdd_ExcessOfTaxBasisOfPartnershipsAssets        
Vacant-Phoenix AZ [Member]              
Organization And Significant Accounting Policies [Line Items]              
Property impairment write-(up) down         (142,747)us-gaap_ImpairmentOfRealEstate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= zzdd_VacantPhoenixMember
   
Limited Partners [Member]              
Organization And Significant Accounting Policies [Line Items]              
Aggregate capital contributions           100us-gaap_PartnersCapitalAccountContributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
 
Number of Properties available to be leased     11us-gaap_NumberOfRealEstateProperties
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
       
Number of states Partnership Property Located     4us-gaap_NumberOfStatesInWhichEntityOperates
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
       
General Partner [Member]              
Organization And Significant Accounting Policies [Line Items]              
Aggregate capital contributions           $ 200us-gaap_PartnersCapitalAccountContributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
 
General Partner [Member] | Minimum [Member]              
Organization And Significant Accounting Policies [Line Items]              
Interest offering             25,000us-gaap_UnitsOfPartnershipInterestAmount
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
General Partner [Member] | Maximum [Member]              
Organization And Significant Accounting Policies [Line Items]              
Interest offering             50,000us-gaap_UnitsOfPartnershipInterestAmount
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Wendgusta [Member]              
Organization And Significant Accounting Policies [Line Items]              
Property lease(s)     56.00%zzdd_EntityWideRevenueMajorCustomerPercentageTwo
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= zzdd_WendgustaMember
       
Wendcharles I [Member]              
Organization And Significant Accounting Policies [Line Items]              
Property lease(s)     15.00%zzdd_EntityWideRevenueMajorCustomerPercentageTwo
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= zzdd_WendcharlesOneMember
       
Wendcharles II [Member]              
Organization And Significant Accounting Policies [Line Items]              
Property lease(s)     8.00%zzdd_EntityWideRevenueMajorCustomerPercentageTwo
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= zzdd_WendcharlesTwoMember