Accounting Policies and Related Matters - Spot Occupancy (Details)	Mar. 31, 2021	Feb. 28, 2021	Jan. 30, 2021	Dec. 31, 2020	Feb. 29, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of communities accepting new residents	99.00%
Seniors Housing Operating | COVID-19
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Spot occupancy	73.60%	73.60%	74.40%	75.90%	85.40%
Sequential occupancy change	0.00%	(0.80%)	(1.50%)