Leases and Management Agreements with Five Star - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 442,467	$ 266,286
Basic housing and support services
Disaggregation of Revenue [Line Items]
Total revenues	231,516	87,412
Medicare and Medicaid programs
Disaggregation of Revenue [Line Items]
Total revenues	49,668	8,745
Private pay and other third party payer SNF services
Disaggregation of Revenue [Line Items]
Total revenues	50,785	11,888
Residents fees and services
Disaggregation of Revenue [Line Items]
Total revenues	$ 331,969	$ 108,045