Condensed Balance Sheets (Parentheticals) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Accumulated amortization of acquisition fees	$ 21,101	$ 20,922
Accumulated amortization of property purchase costs	$ 27,875	$ 27,630

Accumulated Amortization of Deferred Reimbursement Acquisition Costs

No definition available.

Name:	crpiii_AccumulatedAmortizationOfDeferredReimbursementAcquisitionCosts
Namespace Prefix:	crpiii_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant