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Related Person Transactions - Narrative (Details) - shares | Dec. 31, 2017 | Sep. 30, 2017
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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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