Investments in and Advances to Unconsolidated Joint Ventures (Details) $ in Thousands	1 Months Ended
	Jun. 30, 2019 USD ($) property joint_venture	Dec. 31, 2018 USD ($) joint_venture
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated joint ventures	$ 518,033	$ 540,088
CCRC JV
Schedule of Equity Method Investments [Line Items]
Property count (in properties) | property	15
Investment ownership percentage	49.00%
Investments in and advances to unconsolidated joint ventures	$ 349,732	365,764
UK JV
Schedule of Equity Method Investments [Line Items]
Property count (in properties) | property	68
Investment ownership percentage	49.00%
Investments in and advances to unconsolidated joint ventures	$ 100,581	101,735
MBK JV
Schedule of Equity Method Investments [Line Items]
Property count (in properties) | property	5
Investment ownership percentage	50.00%
Investments in and advances to unconsolidated joint ventures	$ 34,317	35,435
Other SHOP JVs
Schedule of Equity Method Investments [Line Items]
Property count (in properties) | property	4
Investments in and advances to unconsolidated joint ventures	$ 21,929	25,493
Other SHOP JVs | Minimum
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage	41.00%
Other SHOP JVs | Maximum
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage	90.00%
Waldwick
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage	85.00%
Otay Ranch
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage	90.00%
MBK Development JV
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage	50.00%
Discovery Naples JV
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage	41.00%
Investment return percentage	10.00%
Medical Office JVs
Schedule of Equity Method Investments [Line Items]
Property count (in properties) | property	3
Investments in and advances to unconsolidated joint ventures	$ 9,963	10,160
Number of unconsolidated joint ventures (in joint ventures) | joint_venture	3
Medical Office JVs | Minimum
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage	20.00%
Medical Office JVs | Maximum
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage	67.00%
HCP Ventures IV, LLC
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage	20.00%
HCP Ventures III, LLC
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage	30.00%
Suburban Properties, LLC
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage	67.00%
K&Y JVs
Schedule of Equity Method Investments [Line Items]
Property count (in properties) | property	3
Investment ownership percentage	80.00%
Investments in and advances to unconsolidated joint ventures	$ 1,496	$ 1,430
Number of unconsolidated joint ventures (in joint ventures) | joint_venture	2	3
Advances to unconsolidated joint ventures, net
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated joint ventures	$ 15	$ 71