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Transactions with General Partner and its Affiliates - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended
Mar. 01, 2014
Dec. 31, 1993
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 01, 2014
Related Party Transaction [Line Items]            
Renewal period of Permanent Manager Agreement   2 years        
Minimum amount of Base Fee for managing partnership $ 21,893us-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 1,766zzdd_MaximumReimbursementOnOfficeRentAndRelatedExpenses 13,250zzdd_MaximumReimbursementOnOfficeRentAndRelatedExpenses        
Percentage of increase in Base Fee and Expense reimbursement 1.46%zzdd_PercentageOfIncreaseInBaseFeeAndExpenseReimbursement         1.46%zzdd_PercentageOfIncreaseInBaseFeeAndExpenseReimbursement
Fees received from partnership, by General Partner     59,729zzdd_FeesReceivedFromPartnership      
Restoration fees     0zzdd_RestorationFees 0zzdd_RestorationFees 40zzdd_RestorationFees  
Payable to General Partner     $ 3,254zzdd_PayableToGeneralPartner $ 1,227zzdd_PayableToGeneralPartner    
TPG Finance Corp. [Member]            
Related Party Transaction [Line Items]            
Partnership Interests     200us-gaap_UnitsOfPartnershipInterestAmount
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= zzdd_TpgFinanceCorpMember