The carrying amount of assets an investment adviser manages on behalf of investors.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The number of real estate properties owned as of the balance sheet date.

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The cash outflow associated with the purchase of real estate held-for-investment and real estate joint ventures.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The carrying amount of investments in unconsolidated real estate and other joint ventures not separately presented. This includes direct and indirect investments.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Equity investments in an unconsolidated real estate venture with recognized impairment

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Equity Method Investment, Ownership Percentage By Other Owners

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Loan receivable Stated Interest Rate

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Non-mortgage loans receivable, net

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Number of Potential Board Members

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Number of Board Members Appointed

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Remaining ownership percentage retained by investee

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Investments in Unconsolidated Entities (Details) $ in Thousands	1 Months Ended			6 Months Ended	12 Months Ended
	Oct. 31, 2020 USD ($)	Jul. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) board_member property	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Oct. 30, 2020	Oct. 15, 2020 USD ($) senior_housing	Jul. 31, 2020	Mar. 31, 2020 joint_venture	Jan. 31, 2018
Equity method investments
Number of real estate properties \| property					1,200
Non-mortgage loans receivable, net					$ 57,077	$ 63,724
Loan receivable Stated Interest Rate										9.00%
Equity Method Investment, Other than Temporary Impairment			$ 35,700
Equity investments in an unconsolidated real estate venture with recognized impairment \| joint_venture											1
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures					443,688	45,022
COVID-19 Impact
Equity method investments
Equity Method Investment, Other than Temporary Impairment				$ 10,700	$ 10,700
The Fund [Member]
Equity method investments
Payments to Acquire Real Estate and Real Estate Joint Ventures	$ 1,000,000
The Fund [Member] \| 2020 Acquisitions
Equity method investments
Number of real estate properties \| senior_housing									3
Assets under Management, Carrying Amount									$ 1,800,000
Non-mortgage loans receivable, net									$ 415,000
Loan receivable Stated Interest Rate									2.60%
Atria
Equity method investments
Ownership interests in properties accounted for under the equity method					34.00%
Number of board members appointed \| board_member					2
Number of board members \| board_member					6
Eclipse Senior Living
Equity method investments
Ownership interests in properties accounted for under the equity method					34.00%							34.00%
Number of board members appointed \| board_member					2
Number of board members \| board_member					6
Remaining ownership percentage retained by investee					66.00%
Ardent
Equity method investments
Ownership interests in properties accounted for under the equity method					9.80%
Number of board members appointed \| board_member					1
Number of board members \| board_member					11
Real Estate Joint Ventures
Equity method investments
Ownership interests in properties accounted for under the equity method		25.00%
Proceeds from sale of equity method investments		$ 57,500
Unconsolidated Properties \| The Fund [Member]
Equity method investments
Ownership interests in properties accounted for under the equity method					22.90%
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures					$ 279,983	0
Unconsolidated Properties \| VTRAZ JV [Member]
Equity method investments
Ownership interests in properties accounted for under the equity method					22.80%
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures					$ 34,690	41,739
Unconsolidated Properties \| R&I JV [Member]
Equity method investments
Ownership interests in properties accounted for under the equity method					50.30%
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures					$ 123,445	0
Unconsolidated Properties \| Equity Method Investment, Nonconsolidated Investee [Member]
Equity method investments
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures					$ 5,570	3,283
Unconsolidated Properties \| Equity Method Investment, Nonconsolidated Investee [Member] \| Minimum
Equity method investments
Ownership interests in properties accounted for under the equity method					34.00%
Unconsolidated Properties \| Equity Method Investment, Nonconsolidated Investee [Member] \| Maximum
Equity method investments
Ownership interests in properties accounted for under the equity method					50.00%
Unconsolidated Properties \| Ventas Investment Management Platform (VIM)
Equity method investments
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures					$ 438,118	41,739
Management Service
Equity method investments
Revenue from contracts with customers					$ 6,700	$ 3,400	$ 5,800
GIC JV Project [Member] \| Research and Innovation Center
Equity method investments
Ownership interests in properties accounted for under the equity method								50.00%
GIC JV Project [Member] \| Research and Innovation Center \| R&I JV [Member]
Equity method investments
Equity Method Investment, Ownership Percentage By Other Owners								45.00%