Intangibles - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($)	Mar. 31, 2020 property	Jan. 31, 2020 property	Oct. 31, 2019 property	Jan. 01, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items]
Property count | property				15
Weighted average remaining amortization period in years	5 years	5 years
Weighted average remaining amortization period in years	8 years	7 years
Finite-lived intangible assets, net | $	$ 519,917	$ 260,204
Reclassification of intangible liabilities | $	144,199	$ 74,991
Accounting Standards Update 2016-12
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net | $						$ 39,000
Reclassification of intangible liabilities | $						$ 6,000
Brookedale MTCA
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired | $	352,000
Intangible liabilities acquired | $	$ 83,000
Weighted average remaining amortization period in years	7 years
Weighted average remaining amortization period in years	9 years
CCRC JV Investment | Brookedale MTCA
Finite-Lived Intangible Assets [Line Items]
Property count | property				15
Other Non-Reporting Segment | Assets leased to others
Finite-Lived Intangible Assets [Line Items]
Property count | property			1
Other Non-Reporting Segment | Assets leased to others | Brookedale MTCA
Finite-Lived Intangible Assets [Line Items]
Property count | property				13
Other Non-Reporting Segment | CCRC JV Investment | Assets leased to others
Finite-Lived Intangible Assets [Line Items]
Property count | property			15		15
Other Non-Reporting Segment | CCRC JV Investment | Assets leased to others | Brookedale MTCA
Finite-Lived Intangible Assets [Line Items]
Property count | property	13		13	13