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Concentration of Credit Risk - Schedule of Concentration of Credit Risk (Details) - property | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Senior housing triple-net |  |  |
Concentration Risk [Line Items] |  |  |
Number of properties classified as held for sale | 64 |  |
Brookdale Senior Living | Total Assets | Customer Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk (as a percent) | 10.00% | 17.00% |
Brookdale Senior Living | Revenue | Customer Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk (as a percent) | 8.00% | 12.00% | 13.00%
Brookdale Senior Living | Senior housing triple-net | Total Assets | Customer Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk (as a percent) | 39.00% | 69.00% |
Brookdale Senior Living | Senior housing triple-net | Revenue | Customer Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk (as a percent) | 47.00% | 59.00% | 58.00%

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