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Leases and Management Agreements with Five Star (Details)	1 Months Ended	3 Months Ended
	Jun. 30, 2016 USD ($) pooling_agreement lease_agreement community	Mar. 31, 2017 USD ($) lease_agreement community	Mar. 31, 2016 USD ($) community	Dec. 31, 2016 USD ($)	Jun. 29, 2016 community	May 31, 2015
Related party transaction, property management agreement, number of communities subject to reset of annual minimum return | community					10
Five Star
Number of communities leased by the Company | community		185	177
Number of leases with related party | lease_agreement		5
Total rental income recognized		$ 50,985,000	$ 48,108,000
Related party transaction, annual rents due		1,445,000	1,473,000
Rents receivable		16,987,000		$ 18,320,000
Real estate improvements purchased		8,082,000	5,755,000
Increase or decrease in annual lease rent payable		648,000	462,000
Property management agreement expense		$ 3,299,000	$ 2,804,000
Number of pre-existing management agreements terminated | pooling_agreement	3
Number of pre-existing management agreements | lease_agreement	4
Five Star | Rents from significant lessee | Revenues
% of Total (as a percent)		19.30%
Five Star | Rents from significant lessee | Investment
% of Total (as a percent)		29.60%
Senior Living Communities | Five Star
Number of communities managed by related party | community		68	60
Number of separate management agreements | pooling_agreement	10
Four States | Senior Living Communities
Number of properties acquired | community	7
Real estate aggregate purchase price	$ 112,350,000
A L Pooling Agreements | Five Star
Related party transaction, property management agreement, management fees as percentage of gross revenues					5.00%	3.00%
Related party transaction property management agreement, payment of capital expenditure as percentage of the funded amount					0.03
Related party transaction, property management agreement, incentive fee as percentage of annual net operating income after realization of specified percentage of annual return					20.00%	35.00%

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- Definition

Represents the increase or decrease on the annual rent the lessee is obligated to pay on an operating lease.

+ References

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- Definition

Represents the number of communities managed by a related party.

+ References

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- Definition

Represents the number of pre-existing management agreements.

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Number of Pre-Existing Management Agreements Terminated

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- Definition

Represents the number of properties acquired or agreed to be acquired by the entity.

+ References

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- Definition

Represents the number of separate management agreements entered for communities acquired, upon termination of a pre-existing combined management agreement.

+ References

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- Definition

Number of Communities Leased by the Company

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- Definition

Number of Leases With Related Party

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- Definition

Represents the aggregate purchase price excluding acquisition costs of real estate properties acquired or agreed to be acquired by the entity.

+ References

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- Definition

Represents the amount of improvements to real estate properties made by lessees and purchased by the entity.

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Related Party Transaction, Annual Rents Due

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Expenses recognized during the period resulting from property management transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

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- Definition

Represents the incentive fee payable to related parties under property management agreement expressed as a percentage of the annual net operating income after the entity realizes an annual return equal to specified percentage of its invested capital.

+ References

No definition available.

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- Definition

Represents the management fees payable to related parties under property management agreement expressed as a percentage of gross revenues.

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- Definition

Represents the payment of management capital expenditure as a percentage of amount funded by the company.

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- Definition

Represents rents receivable at the balance sheet date.

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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://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 275
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-Section 50
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- Definition

The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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