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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)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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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)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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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

+ References

No definition available.

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- Definition

Lease Modifications, Number Of Properties

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No definition available.

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- Definition

Number Of Properties Leased, Transitioned, Or Sold

+ References

No definition available.

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- Definition

The number of properties owned that are leased to unaffiliated tenants under triple-net lease terms.

+ References

No definition available.

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- Definition

Number Of Properties Transitioned

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No definition available.

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- Definition

Number Of Properties With Leases Set To Expire

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Number of real estate properties for which an annual management fee is paid pursuant to long-term management agreements which provide for comprehensive property management and accounting services.

+ References

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	12 Months Ended
	Dec. 31, 2014 property	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013
Concentration of credit risk
Number of states	46	46
Number of Canadian provinces	7	7
Number of properties leased	922	922
Ownership interests in properties accounted for under the equity method (as a percent)					5.00%
Emeritus Corporation [Member]
Concentration of credit risk
Number of properties leased	15	15
Seniors Housing Communities
Concentration of credit risk
Number of seniors housing communities under long-term management agreements	269	269
ATRIA
Concentration of credit risk
Ownership interests in properties accounted for under the equity method (as a percent)	34.00%	34.00%
KINDRED
Concentration of credit risk
Number of properties re-leased, transitioned to new operators or sold	107	107
Number of properties whose leases are set to expire	108	108
Number of properties transitioned	9
Lease modifications, number of properties	34
Lease modification and transition agreement amount	$ 37	37
Total gross book value of properties \| Seniors Housing Communities
Concentration of credit risk
Percentage of real estate investments based on gross book value (as a percent)		65.50%
Total gross book value of properties \| Skilled nursing facilities, hospitals, MOBs and other healthcare assets
Concentration of credit risk
Percentage of real estate investments based on gross book value (as a percent)		34.50%
Total gross book value of properties \| ATRIA
Concentration of credit risk
Percentage of real estate investments based on gross book value (as a percent)		23.60%
Total gross book value of properties \| SUNRISE
Concentration of credit risk
Percentage of real estate investments based on gross book value (as a percent)		12.30%
Total gross book value of properties \| BROOKDALE SENIOR LIVING
Concentration of credit risk
Percentage of real estate investments based on gross book value (as a percent)		10.20%
Total gross book value of properties \| KINDRED
Concentration of credit risk
Percentage of real estate investments based on gross book value (as a percent)		2.00%
Total revenues or NOI \| California
Concentration of credit risk
Number of states accounting for more than 10% of total revenues		1
Total revenues \| BROOKDALE SENIOR LIVING
Concentration of credit risk
Percentage of real estate investments based on gross book value (as a percent)		5.50%	5.60%	6.30%
Total revenues \| KINDRED
Concentration of credit risk
Percentage of real estate investments based on gross book value (as a percent)		6.20%	8.10%	10.30%
Total NOI \| BROOKDALE SENIOR LIVING
Concentration of credit risk
Percentage of real estate investments based on gross book value (as a percent)		9.20%	9.20%	10.50%
Total NOI \| KINDRED
Concentration of credit risk
Percentage of real estate investments based on gross book value (as a percent)		10.20%	13.40%	17.10%