Leases and Management Agreements with Five Star - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 410,311	$ 262,003	$ 852,778	$ 528,289
Basic housing and support services
Disaggregation of Revenue [Line Items]
Total revenues	218,783	89,082	450,299	176,494
Medicare and Medicaid programs
Disaggregation of Revenue [Line Items]
Total revenues	42,910	7,686	92,578	16,431
Private pay and other third party payer SNF services
Disaggregation of Revenue [Line Items]
Total revenues	42,411	12,138	93,196	24,026
Residents fees and services
Disaggregation of Revenue [Line Items]
Total revenues	$ 304,104	$ 108,906	$ 636,073	$ 216,951