Concentration of Credit Risk - Narrative (Details) - Brookdale Senior Living	12 Months Ended
Dec. 31, 2018 facility renewal	Dec. 31, 2017
SHOP \| Management and Accounting Services
Concentration Risk [Line Items]
Management agreement renewal term (in years)	5 years
SHOP \| Percentage of Total Company Assets
Concentration Risk [Line Items]
Concentration risk (as a percent)	7.00%	13.00%
Management and Accounting Services \| SHOP
Concentration Risk [Line Items]
Number of investments in senior housing facility joint ventures (in joint ventures) \| facility	35
Number of unconsolidated joint ventures (in joint ventures) \| facility	16
Minimum
Concentration Risk [Line Items]
Percentage of EDITDAR payable as base management fee	4.50%
Minimum \| SHOP \| Management and Accounting Services
Concentration Risk [Line Items]
Management agreement term (in years)	10 years
Management agreement number of renewals (in renewals) \| renewal	3
Maximum
Concentration Risk [Line Items]
Percentage of EDITDAR payable as base management fee	5.00%
Maximum \| SHOP \| Management and Accounting Services
Concentration Risk [Line Items]
Management agreement term (in years)	15 years
Management agreement number of renewals (in renewals) \| renewal	4

The number of renewals available under the management agreement.

No definition available.

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- Definition

Represents the term of renewals of the agreement under which the Company receives management and accounting services.

+ References

No definition available.

+ Details

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- Definition

Represents the term of the agreement under which the Company receives management and accounting services.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of EBITDAR that is payable by the entity as base management fee.

+ References

No definition available.

+ Details

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- Definition

Represents the total number of facilities.

+ References

No definition available.

+ Details

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- Definition

Number of Facilities Owned by Unconsolidated Joint Venture

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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