Investments in Unconsolidated Joint Ventures - Schedule of Company Owned Interests in Entities, Accounted Under Equity Method (Details) $ in Thousands	Dec. 31, 2025 USD ($) property joint_venture	Sep. 30, 2025	Dec. 31, 2024 USD ($)	Jan. 31, 2024 property	Apr. 30, 2023
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated joint ventures	$ 802,601		$ 936,814
South San Francisco JVs
Schedule of Equity Method Investments [Line Items]
Investment ownership (in percent)		30.00%
Outpatient Medical JVs
Schedule of Equity Method Investments [Line Items]
Number of unconsolidated joint ventures (in joint ventures) | joint_venture	2
HCP Ventures IV, LLC
Schedule of Equity Method Investments [Line Items]
Investment ownership (in percent)	20.00%				80.00%
Suburban Properties, LLC
Schedule of Equity Method Investments [Line Items]
Investment ownership (in percent)	67.00%
Senior housing | SWF SH JV
Schedule of Equity Method Investments [Line Items]
Property count | property	19
Investment ownership (in percent)	54.00%
Equity method investments	$ 312,709		322,551
Other | HQ Point Preferred Equity Investment
Schedule of Equity Method Investments [Line Items]
Property count | property	2
Investment ownership (in percent)	36.00%
Equity method investments	$ 53,859		0
Lab | South San Francisco JVs
Schedule of Equity Method Investments [Line Items]
Property count | property	7
Investment ownership (in percent)	70.00%
Equity method investments	$ 285,387		446,145
Lab | Callan Ridge JV
Schedule of Equity Method Investments [Line Items]
Property count | property	2			2
Investment ownership (in percent)	35.00%
Equity method investments	$ 74,369		69,709
Lab | Lab JV
Schedule of Equity Method Investments [Line Items]
Property count | property	1
Investment ownership (in percent)	49.00%
Equity method investments	$ 31,406		29,916
Lab | Needham Land Parcel JV
Schedule of Equity Method Investments [Line Items]
Property count | property	0
Investment ownership (in percent)	38.00%
Equity method investments	$ 12,453		21,348
Outpatient Medical | PMAK JV
Schedule of Equity Method Investments [Line Items]
Property count | property	59
Investment ownership (in percent)	12.00%
Equity method investments	$ 21,711		32,511
Outpatient Medical | Outpatient Medical JVs
Schedule of Equity Method Investments [Line Items]
Property count | property	2
Equity method investments	$ 7,177		7,199
Outpatient Medical | Outpatient Medical JVs | Minimum
Schedule of Equity Method Investments [Line Items]
Investment ownership (in percent)	20.00%
Outpatient Medical | Outpatient Medical JVs | Maximum
Schedule of Equity Method Investments [Line Items]
Investment ownership (in percent)	67.00%
Outpatient Medical | Davis JV
Schedule of Equity Method Investments [Line Items]
Property count | property	19
Investment ownership (in percent)	48.00%
Equity method investments	$ 3,530		$ 7,435