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Investments in Real Estate Entities - Expensed Acquisition, Development and Other Pursuit Costs and Impairment of Long-Lived Assets & Casualty Gains and Losses (Details) | 3 Months Ended | 9 Months Ended | 15 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) land_parcel | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Equity method investment |  |  |  |  |  |
Business combination, acquisition related costs, abandoned pursuit costs | $ 789,000 | $ 2,170,000 | $ 2,087,000 | $ 3,522,000 |  |
Impairment of investment in unconsolidated entities | 0 | 0 | 0 | 0 |  |
Casualty and impairment loss (gain), net | 0 | 0 | 11,688,000 | $ (3,935,000) |  |
Number of land parcels impaired | land_parcel |  |  |  | 3 |  |
Net operating real estate | 15,767,760,000 |  | 15,767,760,000 |  |  | $ 15,045,593,000
Insurance proceeds for property damage claims |  |  | 13,268,000 | $ 17,196,000 |  |
Land |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Casualty and impairment loss (gain), net |  |  | 9,350,000 | 10,500,000 |  |
Avalon Maplewood |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Casualty and impairment loss (gain), net |  |  | 2,338,000 |  |  |
Casualty Loss |  |  | 19,481,000 |  |  |
Net operating real estate | 16,361,000 |  | 16,361,000 |  |  |
Other nonrecurring expense |  |  | 3,120,000 |  |  |
Insurance recoveries | 19,696,000 |  | 17,143,000 |  |  |
Insurance proceeds for property damage claims | 7,076,000 |  | 13,268,000 |  |  |
Gain on business interruption insurance recovery | $ 3,495,000 |  | $ 3,495,000 |  |  |
Avalon at Edgewater |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Casualty and impairment loss (gain), net |  |  |  | 8,702,000 |  |
Insurance recoveries |  |  |  | 29,008,000 | $ 73,150,000 |
Gain on business interruption insurance recovery |  |  |  | 20,306,000 |  |
New England |  |  |  |  |  |
Equity method investment |  |  |  |  |  |
Casualty and impairment loss (gain), net |  | (5,732,000) |  | 5,732,000 |  |
Casualty Loss |  | 2,761,000 |  | 2,761,000 |  |
Insurance recoveries |  | $ 8,493,000 |  | $ 8,493,000 |  |

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- Definition The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64839914&loc=d3e16285-107787 + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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