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Related Person Transactions - Narrative (Details) - shares	Dec. 31, 2017	Sep. 30, 2017
ABP Trust | Class A common shares
Related Party Transaction [Line Items]
Common stock shares outstanding (in shares)	162,567
ABP Trust | Class A Units
Related Party Transaction [Line Items]
Common stock shares outstanding (in shares)	15,000,000
GOV | Class A common shares
Related Party Transaction [Line Items]
Shares owned (in shares)	1,214,225
HPT | Class A common shares
Related Party Transaction [Line Items]
Shares owned (in shares)	2,503,777
SIR | Class A common shares
Related Party Transaction [Line Items]
Shares owned (in shares)	1,586,836
SNH | Class A common shares
Related Party Transaction [Line Items]
Shares owned (in shares)	2,637,408
Class A common shares
Related Party Transaction [Line Items]
Common stock shares outstanding (in shares)	15,164,066	15,164,066
GOV
Related Party Transaction [Line Items]
Ownership percentage (for TA, less than)	1.80%
HPT
Related Party Transaction [Line Items]
Ownership percentage (for TA, less than)	1.50%
SIR
Related Party Transaction [Line Items]
Ownership percentage (for TA, less than)	1.90%
SNH
Related Party Transaction [Line Items]
Ownership percentage (for TA, less than)	1.30%
TRMT
Related Party Transaction [Line Items]
Ownership percentage (for TA, less than)	19.20%
TA
Related Party Transaction [Line Items]
Ownership percentage (for TA, less than)	1.00%
Common shares | Five Star | Barry Portnoy
Related Party Transaction [Line Items]
Equity method investment ownership percentage	36.40%

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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