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Related Person Transactions - Amount Due from Related Parties (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
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Related Party Transaction [Line Items] |  |
Due from related parties | $ 90,369 | $ 102,759
Managed Equity REITs |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 85,459 | 94,301
DHC |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 27,583 | 25,505
ILPT |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 8,880 | 10,630
OPI |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 38,412 | 39,233
SVC |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 10,584 | 18,933
Managed Operators |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 807 | 565
Five Star |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 251 | 136
Sonesta |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 0 | 37
TA |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 556 | 392
Other Client Companies |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 4,103 | 7,893
ABP Trust |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 3,454 | 2,580
AIC |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 7 | 7
Open End Fund |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 0 | 4,567
RMRM |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 0 | 75
TRMT |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 633 | 664
Centre Street |  |
Related Party Transaction [Line Items] |  |
Due from related parties | $ 9 | $ 0

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