Amount of annual rent reallocated per the definitive agreements.

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Represents amount of annualized rent reduction upon sale or transition, oer definitive agreements.

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Represents the amount of debt provided.

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Represents the amount of debt provided by third party.

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Represents the number of properties sold during the period, not categorized as discontinued operations.

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Represents number of assets sold or transited per definitive agreements.

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Number of properties transited to a new regional operator.

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The number of properties held for sale at the reporting date.

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Number of facilities on which the purchase option was exercised.

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Total consideration from sales of purchase options.

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Total consideration, cash and noncash, received by seller for the sale of real estate.

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Total consideration, cash and noncash, received by seller for the sale of real estate, held for sale.

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No definition available.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer.

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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 net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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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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Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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The cash inflow associated with the proceeds from sale of notes receivable, as well as principal collections from a borrowing supported by a written promise to pay an obligation (note receivable).

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Dispositions of Real Estate (Details)	1 Months Ended			3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
Dispositions of Real Estate (Details)	Oct. 31, 2016 USD ($) Asset facility property	Sep. 30, 2016 USD ($) facility	May 31, 2016 USD ($)	Sep. 30, 2016 USD ($) facility	Sep. 30, 2015 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($) facility building	Sep. 30, 2015 USD ($) property	Dec. 31, 2018 USD ($) tranche	Jul. 31, 2016 facility	Jan. 31, 2016 facility	Dec. 31, 2015 USD ($) facility
Dispositions of Real Estate
Real estate and related assets held for sale, net		$ 372,968,000		$ 372,968,000			$ 372,968,000					$ 314,126,000
(Loss) gain on sales of real estate				(9,000)	$ 52,000		119,605,000	$ 6,377,000
Impairment					$ 69,622,000			592,921,000
Carrying value of aggregate investments		12,534,471,000		$ 12,534,471,000			$ 12,534,471,000					$ 12,198,704,000
Number of facilities, purchased option exercised on \| facility											8
Forecast
Dispositions of Real Estate
Number of properties classified as held for sale \| tranche									2
Consideration from sale of a purchase option						$ 311,000,000			$ 269,000,000
RIDEA II
Dispositions of Real Estate
Number of properties disposed \| Asset	8
RIDEA III
Dispositions of Real Estate
Total consideration for disposition of real estate	$ 22,000,000	$ 13,000,000
Subsequent event
Dispositions of Real Estate
Debt provided	$ 10,000,000
Maturity period of debt instruments	5 years
Stated interest rate (as a percent)	9.00%
Number of properties transited to a new regional operator \| property	3
Brookdale
Dispositions of Real Estate
Number of properties disposed \| Asset	64
Total consideration for disposition of real estate	$ 1,125,000,000
Number of assets sold or transited \| Asset	25
Annual rent reallocated	$ 9,600,000
Post-acute/skilled nursing
Dispositions of Real Estate
Number of properties disposed \| facility							5
Life science
Dispositions of Real Estate
Number of properties classified as held for sale \| facility		8		8			8			4		4
Total consideration for disposition of real estate							$ 74,000,000	11,000,000
Total consideration for disposition of real estate held for sale							$ 76,000,000
Medical office
Dispositions of Real Estate
Number of properties disposed \| building							3
Total consideration for disposition of real estate							$ 20,000,000	$ 400,000
SHOP
Dispositions of Real Estate
Number of properties classified as held for sale \| facility		2		2			2
Number of properties disposed \| facility	2
Total consideration for disposition of real estate							$ 6,000,000
SH NNN
Dispositions of Real Estate
Number of properties disposed							2	9
Total consideration for disposition of real estate							$ 130,000,000	$ 60,000,000
SH NNN \| Subsequent event
Dispositions of Real Estate
Number of properties disposed \| facility	7
Total consideration for disposition of real estate	$ 88,000,000
HCP/CPA/Brookdale JV
Dispositions of Real Estate
Debt provided			$ 630,000,000
Debt provided by third-party			365,000,000
Debt provided by entity			265,000,000
Proceeds from issuance of debt			470,000,000
Proceeds from note receivable			$ 265,000,000
HCP/CPA/Brookdale JV \| RIDEA II
Dispositions of Real Estate
Investment ownership percentage			40.00%
Brookdale
Dispositions of Real Estate
Annualized rent reduction	$ 10,500,000