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Related Person Transactions - RMR LLC Management Fees and Reimbursements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Related person transactions
Property management and construction supervision fees paid	$ 1,954	$ 1,714	$ 5,189	$ 4,629
Repurchase of common shares (in shares)			13,113
RMR LLC
Related person transactions
Business management fees	$ 8,682	8,077	$ 26,644	22,492
Base business management fee payable in cash (as a percent)	100.00%		100.00%
RMR LLC
Related person transactions
Property management and construction supervision fees	$ 2,533	2,211	$ 7,554	$ 5,928
Share grants (in shares)			84,000	81,700
Accrual for RMR LLC employee share grants and internal audit costs	$ 302	$ 662	$ 1,337	$ 1,615
Common Shares | RMR LLC
Related person transactions
Common shares issued as payment for base business management fee			68,983,000	98,449,000

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- Definition

Represents the expense amount accrued for employee share grants and internal audit costs to RMR LLC employees.

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- Definition

Represents the percentage of base business management fees payable in cash.

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Represents the property management and construction supervision fees incurred pursuant to business and property management agreements with related parties.

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Represents the property management and construction supervision fees paid to related parties.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Net number of share options (or share units) granted during the period.

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Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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