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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

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-Publisher FASB

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-Section 50

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

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- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

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- Definition

Lease Modification And Transition Agreement, Amount

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No definition available.

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Lease Modifications, Number Of Properties

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- Definition

The number of properties that are managed by the independent third party.

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No definition available.

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- Definition

Represents the number of the properties which are classified as held for sale.

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Number Of Properties Transitioned

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No definition available.

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- Definition

The number of provinces in which the entity operates as of the balance sheet date.

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- Definition

Number of States Accounting for More than Ten Percent of Net Operating Income

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No definition available.

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- Definition

The number of states accounting for more than ten percent of total revenues.

+ References

No definition available.

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CONCENTRATION OF CREDIT RISK (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Dec. 31, 2014 property	Mar. 31, 2015	Mar. 31, 2014
Concentration Risk [Line Items]
Number of states		47
Number of Canadian provinces		7
Properties classified as held for sale	50	28
ATRIA
Concentration Risk [Line Items]
Ownership interests accounted for under the equity method (as a percent)	34.00%	34.00%
Kindred
Concentration Risk [Line Items]
Number of properties transitioned	9
Lease modifications, number of properties	34
Lease modification and transition agreement amount	$ 37
Skilled Nursing Facilities \| Kindred
Concentration Risk [Line Items]
Properties classified as held for sale		1
Seniors Housing Communities
Concentration Risk [Line Items]
Number of seniors housing communities under long-term management agreements		305
Seniors Housing Communities \| Atria and Sunrise
Concentration Risk [Line Items]
Number of seniors housing communities under long-term management agreements		269
Total gross book value of properties \| ATRIA
Concentration Risk [Line Items]
Concentration percentage		21.10%
Total gross book value of properties \| SUNRISE
Concentration Risk [Line Items]
Concentration percentage		11.00%
Total gross book value of properties \| Brookdale Senior Living
Concentration Risk [Line Items]
Concentration percentage		8.20%
Total gross book value of properties \| Kindred
Concentration Risk [Line Items]
Concentration percentage		2.00%
Total gross book value of properties \| Seniors Housing Communities
Concentration Risk [Line Items]
Concentration percentage		61.50%
Total gross book value of properties \| Hospitals, Medical Office Building, and Other
Concentration Risk [Line Items]
Concentration percentage		38.50%
Total revenues
Concentration Risk [Line Items]
Number of states accounting for more than 10% of total revenues		1
Total revenues \| Brookdale Senior Living
Concentration Risk [Line Items]
Concentration percentage		5.50%	5.50%
Total revenues \| Kindred
Concentration Risk [Line Items]
Concentration percentage		5.30%	7.40%
Total NOI
Concentration Risk [Line Items]
Number of states accounting for more than 10% of net operating income		1
Total NOI \| Brookdale Senior Living
Concentration Risk [Line Items]
Concentration percentage		9.10%	9.00%
Total NOI \| Kindred
Concentration Risk [Line Items]
Concentration percentage		8.80%	12.20%