Investments In Unconsolidated Joint Ventures (PruRose Riverwalk G, L.L.C.) (Narrative) (Details) (USD $)		12 Months Ended							12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 West New York Parcel G Apartments Investors, L.L.C. [Member]	Dec. 31, 2012 Riverwalk G Urban Renewal, L.L.C. [Member]	Dec. 31, 2012 Prudential [Member]	Oct. 23, 2012 PruRose Riverwalk G, L.L.C. [Member] item	Dec. 31, 2012 PruRose Riverwalk G, L.L.C. [Member] West New York Parcel G Apartments Investors, L.L.C. [Member]	Oct. 23, 2012 PruRose Riverwalk G's Interest In Riverwalk G Urban Renewal [Member]	Dec. 31, 2012 Construction Loan [Member] West New York Parcel G Apartments Investors, L.L.C. [Member]	Dec. 31, 2012 Construction Loan [Member] Riverwalk G Urban Renewal, L.L.C. [Member]	Dec. 31, 2012 RiverTrace Project [Member] West New York Parcel G Apartments Investors, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Indirect residual ownership percentage					25.00%
Number of stories					12
Number of units					316
Percentage of interest in venture					50.00%
Investment ownership percentage							50.00%
Total project costs		$ 118,100,000								$ 35,000,000
Maximum borrowing capacity	600,000,000							83,100,000	83,100,000
Percentage of operating return on capital			7.75%
Capital balance				14,700,000		35,000,000
Accumulated unpaid operating return						3,700,000
Percentage of capital event cash flows distributed		100.00%
Internal rate of return		7.75%
Amount of company's initial distributions to be redirected				1,300,000
Amount outstanding									18,800,000
Interest rate									6.00%
Loan maturity date									Jul. 01, 2021
Period of loan guarantee by company following completion of project									6 months
Development management and other services fees			$ 133,000