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Related Person Transactions - Revenues from Related Parties (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 217,913 | $ 104,684
Revenue from unrelated parties | 628 | 610
Total revenues | $ 218,541 | $ 105,294
Percentage of revenues from related parties | 99.70% | 99.40%
Percentage of revenues from unrelated parties | 0.30% | 0.60%
Percentage of revenue from related parties, net | 100.00% | 99.98044%
Managed REITs |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 208,110 | $ 96,534
Percentage of revenues from related parties | 95.20% | 91.70%
GOV |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 13,509 | $ 8,225
Percentage of revenues from related parties | 6.20% | 7.80%
HPT |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 86,066 | $ 62,728
Percentage of revenues from related parties | 39.40% | 59.60%
SIR |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 36,990 | $ 10,957
Percentage of revenues from related parties | 16.90% | 10.40%
SNH |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 71,545 | $ 14,624
Percentage of revenues from related parties | 32.70% | 13.90%
Managed Operators |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 7,029 | $ 6,713
Percentage of revenues from related parties | 3.20% | 6.30%
Five Star |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 2,690 | $ 2,364
Percentage of revenues from related parties | 1.20% | 2.20%
Sonesta |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 568 | $ 543
Percentage of revenues from related parties | 0.30% | 0.50%
TA |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 3,771 | $ 3,806
Percentage of revenues from related parties | 1.70% | 3.60%
Other |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 2,774 | $ 1,437
Percentage of revenues from related parties | 1.30% | 1.40%
AIC |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 60 | $ 60
Percentage of revenues from related parties | 0.00% | 0.10%
RIF |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 729 | $ 606
Percentage of revenues from related parties | 0.40% | 0.60%
ABP Trust |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 1,279 | $ 771
Percentage of revenues from related parties | 0.60% | 0.70%
TRMT |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 706 | $ 0
Percentage of revenues from related parties | 0.30% | 0.00%

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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 + Details
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