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Related Party Transactions - Distribution and Ownership of Class A Shares (Details) - Class A common shares - shares	Dec. 14, 2015	Sep. 30, 2016	Jun. 05, 2015
GOV
Related Party Transaction [Line Items]
Common stock shares outstanding	441,056
Number of shares owned (in shares)		1,214,225
GOV | Up C Transaction
Related Party Transaction [Line Items]
Number of shares distributed (in shares)	768,032
ABP Trust
Related Party Transaction [Line Items]
Common stock shares outstanding	90,564		90,564
HPT
Related Party Transaction [Line Items]
Number of shares owned (in shares)		2,503,777
HPT | Up C Transaction
Related Party Transaction [Line Items]
Number of shares distributed (in shares)	2,515,344
SIR
Related Party Transaction [Line Items]
Number of shares owned (in shares)		1,586,836
SIR | Up C Transaction
Related Party Transaction [Line Items]
Number of shares distributed (in shares)	1,580,055
SNH
Related Party Transaction [Line Items]
Number of shares owned (in shares)		2,637,408
SNH | Up C Transaction
Related Party Transaction [Line Items]
Number of shares distributed (in shares)	2,635,379
Adam Portnoy | Up C Transaction
Related Party Transaction [Line Items]
Number of shares distributed (in shares)	9,938
Barry Portnoy | Up C Transaction
Related Party Transaction [Line Items]
Number of shares distributed (in shares)	19,283

X

- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-12C.Column B)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010

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-Name Accounting Standards Codification
-Topic 946
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