Related Party Transactions (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Related Party Transactions [Abstract]
Asset management fees	$ 746,000	$ 503,000	$ 1,394,000	$ 982,000

Amount payable to managing member or general partner for management of the day-to-day business functions.

No definition available.

Name:	chpr_ManagementFeeAmountPayable
Namespace Prefix:	chpr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration