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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 275

-SubTopic 10

-Section 50

-Paragraph 20

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

Reference 2: 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=6947722&loc=d3e13537-108611

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=6947722&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

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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Period Type:	instant

- 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.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of net operating income derived from lease agreements.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of total revenues derived from lease agreements.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	duration

- Definition

Threshold percentage which the entity uses for disclosure.

+ References

No definition available.

+ Details

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Concentration of Credit Risk (Details)	12 Months Ended
Concentration of Credit Risk (Details)	Dec. 31, 2011 state province	Dec. 31, 2010	Dec. 31, 2009
Concentration of credit risk
Number of states	46
Revenue concentration risk percentage	10.00%	10.00%	10.00%
Number of Canadian provinces	2
Seniors housing communities
Concentration of credit risk
Number of seniors housing communities under long-term management agreements	197
Brookdale Senior Living
Concentration of credit risk
Percentage of total revenues derived by third party	8.20%	11.90%	12.90%
Percentage of net operating income derived from lease agreements	13.40%	17.30%	19.10%
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)	66.70%
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)	33.30%
Total gross book value of properties \| ATRIA
Concentration of credit risk
Percentage of real estate investments based on gross book value (as a percent)	19.00%
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)	13.00%
Total gross book value of properties \| KINDRED
Concentration of credit risk
Percentage of real estate investments based on gross book value (as a percent)	5.00%
Total gross book value of properties \| SUNRISE
Concentration of credit risk
Percentage of real estate investments based on gross book value (as a percent)	14.40%
Total revenues \| KINDRED
Concentration of credit risk
Percentage of real estate investments based on gross book value (as a percent)	14.30%	24.20%	26.20%
Total NOI \| KINDRED
Concentration of credit risk
Percentage of real estate investments based on gross book value (as a percent)	23.20%	35.60%	38.50%
Total revenues or NOI \| Minimum \| California
Concentration of credit risk
Number of states accounting for more than 10% of total revenues	1
Total revenues or NOI \| Minimum \| Two states
Concentration of credit risk
Number of states accounting for more than 10% of total revenues		2	2