Investments in Unconsolidated Entities (Details)	Sep. 30, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Unamortized Investment In Joint Venture Primarily Attributable To Real Estate And Related Intangible Assets	$ 83,843,000
Sunrise Senior Living Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Unamortized Investment In Joint Venture Primarily Attributable To Real Estate And Related Intangible Assets	$ 83,843,000
Percentage of partnership owned	24.00%
New ownership including new acquisitions	34.00%

Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12.3)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-12C.Column D.2)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant