Transactions with Related Parties (Details) (Mr. Klaritch, an executive vice president, HCPI/Tennessee, LLC)	1 Months Ended	12 Months Ended
	Oct. 31, 2003	Dec. 31, 2012
Mr. Klaritch, an executive vice president | HCPI/Tennessee, LLC
Related Party Transaction
Number of non-managing member DownREIT units received on distribution of rights	113,431
Number of common of DownREIT units in number of shares (in shares)	2
DownREIT units converted		45,000
Common shares issued for DownREIT units converted		90,000