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Schedule III - Real Estate and Accumulated Depreciation (Parenthetical) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) Property ApartmentUnit | Dec. 31, 2016 USD ($)
Real Estate And Accumulated Depreciation [Line Items] |  |
Furniture, fixtures and equipment | $ 1,548,961,000 | $ 1,346,300,000
Land and depreciable property net | $ 14,800,000,000 | $ 15,800,000,000
Real Estate And Accumulated Depreciation Abstract |  |
Total properties | Property | 305 |
Apartment units | ApartmentUnit | 78,611 |
Partially Owned Properties – Unconsolidated |  |
Real Estate And Accumulated Depreciation Abstract |  |
Total properties | Property | 2 |
Apartment units | ApartmentUnit | 945 |
Depreciable Property [Member] |  |
Real Estate And Accumulated Depreciation [Line Items] |  |
Furniture, fixtures and equipment | $ 1,548,960,951 |
Building [Member] |  |
Real Estate And Accumulated Depreciation Abstract |  |
Property, Plant and Equipment, Estimated Useful Lives | 30 years |
Renovations and Improvements Minimum [Member] |  |
Real Estate And Accumulated Depreciation Abstract |  |
Property, Plant and Equipment, Estimated Useful Lives | 5 years |
Renovations and Improvements Maximum [Member] |  |
Real Estate And Accumulated Depreciation Abstract |  |
Property, Plant and Equipment, Estimated Useful Lives | 15 years |
Replacements Minimum [Member] |  |
Real Estate And Accumulated Depreciation Abstract |  |
Property, Plant and Equipment, Estimated Useful Lives | 5 years |
Replacements Maximum [Member] |  |
Real Estate And Accumulated Depreciation Abstract |  |
Property, Plant and Equipment, Estimated Useful Lives | 10 years |
Management Business Renovations and Improvements Minimum [Member] [Member] |  |
Real Estate And Accumulated Depreciation Abstract |  |
Property, Plant and Equipment, Estimated Useful Lives | 3 years |
Management Business Renovations and Improvements Maximum [Member] [Member] |  |
Real Estate And Accumulated Depreciation Abstract |  |
Property, Plant and Equipment, Estimated Useful Lives | 7 years |

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- Definition Carrying value of land and property after the effect of depreciation for Federal Income Tax purposes. + References No definition available. + Details
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- Definition Useful life on which depreciation was computed for entities with a substantial portion of business acquiring and holding investment real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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