Concentration of Credit Risk - Schedule of Concentration of Credit Risk (Details) - property	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Senior housing triple-net
Concentration Risk [Line Items]
Number of properties classified as held for sale (in facilities)		64	64
Brookdale Senior Living | Percentage of Total Company Assets | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)	6.00%	10.00%
Brookdale Senior Living | Percentage of Total Company Revenues | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)	6.00%	8.00%	12.00%
Brookdale Senior Living | Senior housing triple-net | Percentage of Total Company Assets | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)	27.00%	39.00%
Brookdale Senior Living | Senior housing triple-net | Percentage of Total Company Revenues | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)	38.00%	47.00%	59.00%