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Concentration of Credit Risk - Schedule of Concentration Risk (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2017 property | Sep. 30, 2018 | Jun. 30, 2018 facility | Dec. 31, 2017 facility | Sep. 30, 2017 facility | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Total Assets | Brookdale |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  | 8.00% |  | 10.00%
Revenue | Brookdale |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  | 5.00% |  |  | 8.00% | 6.00% | 10.00% |
Senior housing triple-net |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Number of properties disposed | 64 |  | 2 | 2 | 2 |  |  |
Senior housing triple-net | Total Assets | Brookdale |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  | 34.00% |  | 39.00%
Senior housing triple-net | Revenue | Brookdale |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  | 37.00% |  |  | 48.00% | 40.00% | 53.00% |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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