Transactions with Owners with Greater than Ten Percent Beneficial Interests - Advisory Board Fees Paid to Jesse Small (Detail) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Related Party Transactions [Abstract]
Advisory Board Fees paid	$ 875	$ 875	$ 1,750	$ 1,750

Advisory board fees paid to owners with beneficial interest more than 10%.

No definition available.

Name:	zzdd_AdvisoryBoardFeesPaidToOwnersWithBeneficialInterestMoreThanTenPercent
Namespace Prefix:	zzdd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration