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Equity - Noncontrolling Interests Narrative (Details) $ in Thousands, shares in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 07, 2015 USD ($) property | Dec. 31, 2017 USD ($) entity shares | Dec. 31, 2016 USD ($)
Noncontrolling Interest [Line Items] |  |  |
Non-managing member unitholders |  | $ 176,888 | $ 179,336
HCP Ventures V |  |  |
Noncontrolling Interest [Line Items] |  |  |
Noncontrolling interest (as a percent) | 49.00% |  |
Consideration received from sale of noncontrolling interest in HCP Ventures V | $ 110,000 |  |
HCP Ventures V |  |  |
Noncontrolling Interest [Line Items] |  |  |
Number of properties | property | 11 |  |
Noncontrolling Interests |  |  |
Noncontrolling Interest [Line Items] |  |  |
Non-managing members DownREIT units outstanding | shares |  | 4 |
Conversion of DownREIT units (in shares) | shares |  | 7 |
Number of DownREIT LLCs | entity |  | 5 |
Non-managing member unitholders |  | $ 177,000 |
DownREIT unit, fair value |  | $ 173,000 |

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- Definition Fair value of the equity interests owned by noncontrolling preferred unit holders in an entity included in the reporting entity's consolidated financial statements. + References No definition available. + Details
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- Definition Amount of increase in noncontrolling interest from sale of a portion of the parent's controlling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569655-111683 + Details
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