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Related Person Transactions - Leases with RMR LLC (Details) $ in Thousands				1 Months Ended			12 Months Ended
	May. 09, 2015 USD ($) shares	Jan. 29, 2015 USD ($) ft² state property	May. 09, 2014 shareholder	Aug. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jan. 31, 2015 USD ($) property	Dec. 31, 2015 USD ($) ft² state trustee property	Dec. 31, 2014 USD ($) ft² property	Dec. 31, 2013 USD ($)
Related person transactions
Fair value adjustment, liabilities							$ 3,300
Number of states in which properties are located | state							43
Income (loss) recognized arising from equity investments							$ 20	$ 87	$ 334
RMR LLC
Related person transactions
Rental revenue from related party							$ 204	$ 0	0
MOBs
Related person transactions
Number of properties acquired or agreed to be acquired | property						23
Acquisition
Related person transactions
Number of properties acquired or agreed to be acquired | property						23
Acquisition | MOBs
Related person transactions
Number of properties acquired or agreed to be acquired | property							23	2
Purchase price excluding closing costs and working capital adjustments						$ 539,000
Area of real estate properties (in square feet) | ft²							2,170,000	1,776,000
Acquisition | MOBs | SIR
Related person transactions
Debt disposed of from properties sold		$ 29,995
Area of real estate properties (in square feet) | ft²		2,170,000
Number of states in which properties are located | state		12
Amount from SIR related to working capital activity		$ 1,316
GOV
Related person transactions
Number of Independent Trustees who are owners, employees or trustees of related party | trustee							2
Standstill provision period (in months)							36 years
SIR
Related person transactions
Number of Independent Trustees who are owners, employees or trustees of related party | trustee							1
SIR | Acquisition | MOBs
Related person transactions
Number of properties acquired or agreed to be acquired | property		23
Purchase price excluding closing costs and working capital adjustments		$ 532,000
Fair value adjustment, liabilities		$ 7,677
AIC
Related person transactions
Number of shares purchased | shares	2,857
Payments for share purchased	$ 825
Number of other remaining shareholders | shareholder			6
Ownership percentage held by the entity and other shareholders	14.30%
Amount invested in equity investee							$ 6,034
Coverage of purchased property insurance							$ 500,000
Property insurance program term					3 years
Coverage of purchased property insurance for large property					$ 1,000,000
Term of property insurance policy							1 year
Total premiums including taxes and fees							$ 2,785	$ 3,118	4,748
The entity owns less than this percentage of an equity method investment							20.00%
Equity method investments, carrying value							$ 6,827	6,827	5,913
Income (loss) recognized arising from equity investments							20	87	334
RMR LLC
Related person transactions
Aggregate coverage of combined directors' and officers' liability insurance policy purchased by the related party							10,000
Aggregate additional coverage of combined directors' and officers' liability insurance policy purchased by the related party				$ 20,000
Non-indemnifiable coverage of combined directors' and officers' liability insurance policy purchased by the related party				$ 5,000
Premium payable for combined directors' and officers' liability insurance policy							$ 472	$ 736	$ 343

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