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Transactions with General Partner and Its Affiliates - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended
Mar. 01, 2015
Dec. 31, 1993
Mar. 31, 2015
Mar. 01, 2015
Dec. 31, 2014
Related Party Transaction [Line Items]          
Renewal period of Permanent Manager Agreement   2 years      
Minimum amount of Base Fee for managing partnership $ 266,976us-gaap_PaymentForManagementFee $ 159,000us-gaap_PaymentForManagementFee      
Percentage of Base Fee on gross receipts   4.00%zzdd_PercentageOfBaseFeeOnGrossReceipts      
Maximum reimbursement on office rent and related expenses 21,540zzdd_MaximumReimbursementOnOfficeRentAndRelatedExpenses 13,250zzdd_MaximumReimbursementOnOfficeRentAndRelatedExpenses      
Percentage of increase in Base Fee and Expense reimbursement 1.62%zzdd_PercentageOfIncreaseInBaseFeeAndExpenseReimbursement     1.62%zzdd_PercentageOfIncreaseInBaseFeeAndExpenseReimbursement  
Fees received from partnership, by General Partner     59,729zzdd_FeesReceivedFromPartnership    
Payable to General Partner     $ 26zzdd_PayableToGeneralPartner   $ 3,254zzdd_PayableToGeneralPartner
TPG Finance Corp. [Member]          
Related Party Transaction [Line Items]          
Partnership Interests     200us-gaap_UnitsOfPartnershipInterestAmount
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= zzdd_TpgFinanceCorpMember		   200us-gaap_UnitsOfPartnershipInterestAmount
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= zzdd_TpgFinanceCorpMember
General Partner [Member]          
Related Party Transaction [Line Items]          
Partnership Interests     0us-gaap_UnitsOfPartnershipInterestAmount
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember