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Related Party Transactions - Revenue from Related Parties (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Related Party Transaction [Line Items]
Revenues from unrelated parties									$ 362	$ 6,280	$ 116,507
Percentage of revenue from unrelated parties									0.10%	3.30%	41.00%
Revenues, net	$ 56,266	$ 52,211	$ 48,333	$ 110,130	$ 48,111	$ 48,179	$ 49,810	$ 46,836	$ 266,940	$ 192,936	$ 285,046
Percentage of revenue, net									100.00%	100.00%	100.04444%
Managed REITs
Related Party Transaction [Line Items]
Revenue from related parties									$ 234,575	$ 155,341	$ 135,273
Percentage of revenue from related parties									87.90%	80.50%	47.40%
GOV
Related Party Transaction [Line Items]
Revenue from related parties									$ 31,919	$ 28,981	$ 27,287
Percentage of revenue from related parties									12.00%	15.00%	9.60%
HPT
Related Party Transaction [Line Items]
Revenue from related parties									$ 101,715	$ 40,887	$ 43,730
Percentage of revenue from related parties									38.10%	21.20%	15.30%
SIR
Related Party Transaction [Line Items]
Revenue from related parties									$ 42,540	$ 32,260	$ 19,784
Percentage of revenue from related parties									15.90%	16.70%	6.90%
SNH
Related Party Transaction [Line Items]
Revenue from related parties									$ 58,401	$ 53,213	$ 44,472
Percentage of revenue from related parties									21.90%	27.60%	15.60%
Managed Operators
Related Party Transaction [Line Items]
Revenue from related parties									$ 26,362	$ 25,303	$ 26,921
Percentage of revenue from related parties									9.90%	13.10%	9.40%
Five Star
Related Party Transaction [Line Items]
Revenue from related parties									$ 9,406	$ 9,169	$ 12,749
Percentage of revenue from related parties									3.50%	4.70%	4.50%
Sonesta
Related Party Transaction [Line Items]
Revenue from related parties									$ 2,020	$ 1,848	$ 1,501
Percentage of revenue from related parties									0.80%	1.00%	0.50%
TA
Related Party Transaction [Line Items]
Revenue from related parties									$ 14,936	$ 14,286	$ 12,671
Percentage of revenue from related parties									5.60%	7.40%	4.40%
Other
Related Party Transaction [Line Items]
Revenue from related parties									$ 5,641	$ 6,012	$ 6,345
Percentage of revenue from related parties									2.10%	3.10%	2.20%
AIC
Related Party Transaction [Line Items]
Revenue from related parties									$ 240	$ 247	$ 337
Percentage of revenue from related parties									0.10%	0.10%	0.10%
RIF
Related Party Transaction [Line Items]
Revenue from related parties									$ 2,370	$ 2,380	$ 2,244
Percentage of revenue from related parties									0.90%	1.20%	0.80%
ABP Trust
Related Party Transaction [Line Items]
Revenue from related parties									$ 3,031	$ 3,385	$ 3,764
Percentage of revenue from related parties									1.10%	1.80%	1.30%

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+ 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
-Glossary Related Parties
-URI http://asc.fasb.org/extlink&oid=16382449

Reference 3: 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

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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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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