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Investments in Real Estate Entities (Details 2) - Subsequent Event Type [Domain] | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2015 USD ($) community | Jun. 30, 2015 USD ($) community home building | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) community Claim home plaintiff building | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Equity method investment |  |  |  |  |  |
Long-term Debt |  | $ 6,433,889,000 |  | $ 6,433,889,000 |  | $ 6,448,138,000
Real Estate Investment Property, Net |  | 13,495,510,000 |  | 13,495,510,000 |  | 13,219,140,000
Impairment of Real Estate |  | 0 | $ 0 |  | $ 0 |
Casualty and Impairment (Gain) Loss |  | (17,114,000) | 0 | (11,326,000) | 0 |
Assets: |  |  |  |  |  |
Real estate, net |  | 1,513,850,000 |  | 1,513,850,000 |  | 1,617,627,000
Other assets |  | 60,793,000 |  | 60,793,000 |  | 72,290,000
Total assets |  | 1,574,643,000 |  | 1,574,643,000 |  | 1,689,917,000
Liabilities and partners' capital: |  |  |  |  |  |
Mortgage notes payable and credit facility |  | 964,246,000 |  | 964,246,000 |  | 980,128,000
Other liabilities |  | 21,232,000 |  | 21,232,000 |  | 24,884,000
Partners' capital |  | 589,165,000 |  | 589,165,000 |  | 684,905,000
Total liabilities and partners' capital |  | 1,574,643,000 |  | 1,574,643,000 |  | 1,689,917,000
Combined summary of the operating results of the accounted for using the equity method |  |  |  |  |  |
Rental and other income |  | 43,395,000 | 52,270,000 | 88,650,000 | 104,646,000 |
Operating and other expenses |  | (17,375,000) | (20,483,000) | (34,712,000) | (41,691,000) |
Gain on sale of communities |  | 0 | 5,682,000 | 32,490,000 | 5,682,000 |
Interest expense, net |  | (10,334,000) | (13,523,000) | (20,811,000) | (27,413,000) |
Depreciation expense |  | (11,942,000) | (13,863,000) | (23,845,000) | (28,280,000) |
Net income |  | 3,744,000 | 10,083,000 | 41,772,000 | 12,944,000 |
Impairment of investment in unconsolidated entities |  | 0 | 0 | 0 | 0 |
Expensed Acquisition, Development And Other Pursuit Costs, Net of Recoveries |  | $ 673,000 | $ 2,017,000 | $ 1,860,000 | $ 2,732,000 |
Number of Real Estate Properties | community |  | 257 |  | 257 |  |
Number of apartment homes included in operating apartment communities owned | home |  | 74,857 |  | 74,857 |  |
MVPI LLC [Member] |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Long-term Debt |  | $ 103,000,000 |  | $ 103,000,000 |  |
Fixed rate (as a percent) |  | 3.24% |  | 3.24% |  |
Fund I and II |  |  |  |  |  |
Combined summary of the operating results of the accounted for using the equity method |  |  |  |  |  |
Costs in excess of equity in underlying net assets of the respective investments |  | $ 3,312,000 |  | $ 3,312,000 |  | $ 3,880,000
Fund II |  |  |  |  |  |
Combined summary of the operating results of the accounted for using the equity method |  |  |  |  |  |
Maximum amount that will be paid for capital contributions made by partners (as a percent) |  |  |  | 10.00% |  |
Maximum amount that will be paid for capital contributions made by partners |  | 8,910,000 |  | $ 8,910,000 |  |
Avalon Mills [Member] |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Impairment of Real Estate |  |  |  | 800,000 |  |
Avalon at Edgewater [Member] |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Casualty Loss |  | 4,886,000 |  | 5,977,000 |  |
Insurance Proceeds |  | 22,000,000 |  | 44,142,000 |  |
Real Estate Investment Property, Net |  | 21,844,000 |  | 21,844,000 |  |
Casualty and Impairment (Gain) Loss |  | $ (17,114,000) |  | $ (16,321,000) |  |
Combined summary of the operating results of the accounted for using the equity method |  |  |  |  |  |
Number of Real Estate Properties | building |  | 2 |  | 2 |  |
Number of apartment homes included in operating apartment communities owned | home |  | 168 |  | 168 |  |
Loss Contingency, New Claims Filed, Number | Claim |  |  |  | 15 |  |
Loss Contingency, Number of Plaintiffs | plaintiff |  |  |  | 120 |  |
New England [Member] |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Impairment of Real Estate |  |  |  | $ 4,195,000 |  |
Mortgage notes payable | MVPI LLC [Member] |  |  |  |  |  |
Combined summary of the operating results of the accounted for using the equity method |  |  |  |  |  |
Repayments of secured debt |  | $ 105,000,000 |  |  |  |
Notes payable maturing in 2015 | Mortgage notes payable |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Fixed rate (as a percent) | 3.12% |  |  |  |  |
Combined summary of the operating results of the accounted for using the equity method |  |  |  |  |  |
Number of Real Estate Properties | community | 8 |  |  |  |  |
Repayments of secured debt | $ 481,582,000 |  |  |  |  |

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