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Related Party Transactions - Management Fees (Details) - USD ($)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
GOV
Related Party Transaction [Line Items]
Shares from related party (in shares)		30,276	27,103
Value of shares received from related party		$ 692,000	$ 672,000
HPT
Related Party Transaction [Line Items]
Shares from related party (in shares)		84,810	86,969
Value of shares received from related party		$ 2,605,000	$ 2,474,000
SIR
Related Party Transaction [Line Items]
Shares from related party (in shares)		39,927	23,136
Value of shares received from related party		$ 982,000	$ 668,000
SNH
Related Party Transaction [Line Items]
Shares from related party (in shares)		103,265	85,986
Value of shares received from related party		$ 2,285,000	$ 1,978,000
EQC
Related Party Transaction [Line Items]
Shares from related party (in shares)		0	90,135
Value of shares received from related party		$ 0	$ 2,354,000
Managed REITs
Related Party Transaction [Line Items]
Value of shares received from related party	$ 0	$ 6,564,000	$ 8,146,000

X

- Definition

Shares received during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

No definition available.

+ Details

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X

- Definition

Value of shares received from the investment during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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