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Related Person Transactions - Due from/to Related Parties (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Related Party Transaction [Line Items] |  |
Due from related parties | $ 188,251 | $ 32,712
Managed REITs |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 185,748 | 31,238
GOV |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 7,094 | 6,369
HPT |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 82,256 | 7,968
SIR |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 32,140 | 7,351
SNH |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 64,258 | 9,550
Managed Operators |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 966 | 750
Five Star |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 393 | 305
Sonesta |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 0 | 1
TA |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 573 | 444
Other |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 1,537 | 724
AIC |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 20 | 22
RIF |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 35 | 36
ABP Trust |  |
Related Party Transaction [Line Items] |  |
Due from related parties | 498 | 551
TRMT |  |
Related Party Transaction [Line Items] |  |
Due from related parties | $ 984 | $ 115

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