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Summary Accounting Policies (Details) (USD $) | 1 Months Ended | 9 Months Ended | 12 Months Ended |  | 1 Months Ended | 9 Months Ended |  | 9 Months Ended
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Feb. 28, 2014 item | Sep. 30, 2014 item | Dec. 31, 2013 item | Sep. 30, 2014 Noxell Corporation industrial building, Joppa, Maryland | Jun. 30, 2014 Land - River Crossing Apartments, Sandy Springs, Georgia | Sep. 30, 2014 Land - River Crossing Apartments, Sandy Springs, Georgia item | Sep. 30, 2014 Consolidated JV item | Sep. 30, 2014 Consolidated JV Minimum | Sep. 30, 2014 Consolidated JV Maximum | Sep. 30, 2014 Unconsolidated JV item
Investment in Joint Ventures |  |  |  |  |  |  |  |  |  |
Number of joint ventures with controlling interest |  |  |  |  |  |  | 6 |  |  |
Disposals of Properties |  |  |  |  |  |  |  |  |  |
Number of properties sold | 2 |  |  |  |  |  |  |  |  |
Contract Purchase Price |  | $ 32,864,000 |  |  | $ 6,510,000 | $ 6,510,000 |  |  |  |
Number of apartment units in the complex purchased |  |  |  |  |  | 196 |  |  |  |
Maximum exposure to loss |  |  |  |  |  | 6,626,000 |  |  |  |
Carrying value of the land |  | 569,817,000 | 567,358,000 |  |  | 6,516,000 |  |  |  |
Unbilled rent receivable |  | 12,442,000 | 13,743,000 |  |  | 110,000 |  |  |  |
Restricted assets |  |  |  | 0 |  |  |  |  |  |
Land |  | 162,976,000 | 153,529,000 | 3,805,000 |  |  |  |  |  |
Building and improvements (net of depreciation) |  | 406,841,000 | 413,829,000 | 8,081,000 |  |  |  |  |  |
Cash |  |  |  | 318,000 |  |  |  |  |  |
Prepaid expenses and receivables |  |  |  | 38,000 |  |  |  |  |  |
Accrued expenses and other liabilities |  | 10,641,000 | 7,790,000 | 123,000 |  |  |  |  |  |
Non-controlling interest in joint ventures |  | $ 1,324,000 | $ 1,158,000 | $ 309,000 |  |  |  |  |  |
Ownership interest in consolidated joint venture (as a percent) |  |  |  | 95.00% |  |  |  | 85.00% | 95.00% |
Number of unconsolidated joint ventures |  | 5 | 5 |  |  |  |  |  |  | 5
Reclassification |  |  |  |  |  |  |  |  |  |
Number of properties sold and reclassified to discontinued operations | 2 |  |  |  |  |  |  |  |  |

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