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Related Party Transactions - Investment in AIC (Details) - USD ($) $ in Thousands		12 Months Ended
	May 09, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Nov. 14, 2016	Jun. 05, 2015
Related Party Transaction [Line Items]
Payments to acquire shares		$ 0	$ 46,386	$ 0
Equity in earnings of investee		0	115	160
Management services		226,660	162,326	218,753
Due from related parties		32,616	24,432
ABP Trust | Amount Due From Related Party include in Non-Cash Distribution
Related Party Transaction [Line Items]
Due from related parties		28,306
AIC
Related Party Transaction [Line Items]
Management services		240	247	337
Unrealized gain on available for sale securities			35	24
Due from related parties		$ 0	0
RMR LLC | AIC
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners		12.50%
Managed REITs | AIC
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners		12.50%
Five Star | AIC
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners		12.50%
TA | AIC
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners		12.50%
EQC | AIC
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners		12.50%
AIC
Related Party Transaction [Line Items]
Book value of ownership				6,796
Common stock historical basis				6,034
Equity in earnings of investee			$ 115	$ 160
AIC | ABP Trust
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners						14.30%
AIC | Managed REITs
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners		14.30%
AIC | Five Star
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners		14.30%
AIC | TA
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners		14.30%
EQC | AIC | RMR LLC, the Managed REITs, Five Star, TA
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners		14.30%
Payments to acquire shares	$ 5,775
EQC | AIC | RMR LLC
Related Party Transaction [Line Items]
Payments to acquire shares	825
EQC | AIC | Managed REITs
Related Party Transaction [Line Items]
Payments to acquire shares	825
EQC | AIC | Five Star
Related Party Transaction [Line Items]
Payments to acquire shares	825
EQC | AIC | TA
Related Party Transaction [Line Items]
Payments to acquire shares	$ 825
Subsequent Event | Five Star | ABP Trust and Founders
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners					36.80%

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