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Related Person Transactions - copy (Details) $ in Thousands						1 Months Ended			3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended	33 Months Ended
	Oct. 27, 2015 USD ($) room property	Jul. 23, 2015 USD ($) state room property	Jun. 05, 2015 USD ($) agreement shares	Jun. 04, 2015 shares	Jun. 01, 2015 USD ($) property	Oct. 31, 2015 USD ($)	Jul. 31, 2015 item	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($) item property shares	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Vote Option item property shares	Sep. 30, 2015 USD ($) item property shares	Sep. 30, 2014 USD ($) shares	Dec. 31, 2014 USD ($)	Sep. 30, 2015 USD ($) item property shares	Apr. 28, 2015 USD ($)	Dec. 31, 2007
Related Party Transaction [Line Items]
Number of management agreements or leases | item									14		14	14			14
Rental income									$ 73,747	$ 63,837		$ 207,561	$ 190,959
Minimum Annual Rent									253,919		$ 253,919	253,919			$ 253,919
Capital improvements from leased facilities, funded												(172,627)	(159,027)
Increase (decrease) in minimum annual rent												14,365
Deferred percentage rent revenue									0	557		0	2,129
Adjustments included in rental income necessary to record rent on the straight line basis									$ 3,752	553		$ 5,807	1,659
Proceeds received from the VDOT in connection with the eminent domain taking													6,178
Number of Sites | property									193		193	193			193
Gain on sale of real estate												$ 11,015	130
Purchase price excluding closing cost									$ 477,883		$ 477,883	477,883			$ 477,883
Accruals for unpaid amount									46,862		46,862	46,862		$ 40,253	46,862
Amount owed for capital expenditure reimbursements									24,306		$ 24,306	24,306		8,658	$ 24,306
Earnings (losses) recognized related to equity investments									$ (24)	38		$ 71	66
Sonesta ES Suites
Related Party Transaction [Line Items]
Amount expected to be provided for renovation for acquisitions made		$ 45,000
Sonesta agreements
Related Party Transaction [Line Items]
Number of real estate properties leased or managed | property									31		31	31			31
Management agreement fees and expenses									$ 5,742	4,722		$ 16,143	13,052
Procurement and construction supervision fees									496	1,053		1,172	2,803
Purchase price excluding closing cost																$ 750
Amount expected to be provided for renovation for acquisitions made												45,000
RMR Inc
Related Party Transaction [Line Items]
Amount of investment acquired			$ 55,922
Fair value of investment			129,722
Initial other liabilities			$ 72,658
Investment at carrying value, including transaction costs									132,296		$ 132,296	132,296			$ 132,296
Straight line discount amortization period			20 years
Amortization of other liabilities to reduce business and property management fees									911			1,142
TA Prior Leases
Related Party Transaction [Line Items]
Amount of percentage rent recognized under the prior agreement and incorporated in the new agreement														2,902
Deferred rent due in December 2022									$ 107,085		$ 107,085	$ 107,085			$ 107,085
TA New Leases
Related Party Transaction [Line Items]
Number of renewal options available | Option											2
Term of renewal option												15 years
Percentage of non-fuel revenue over threshold amounts									3.00%		3.00%	3.00%			3.00%
Increase (decrease) in minimum annual rent											$ 24,027
Number of Sites | property									153		153	153			153
TA No. 1
Related Party Transaction [Line Items]
Minimum Annual Rent									$ 48,295		$ 48,295	$ 48,295			$ 48,295
Number of Sites | property									39		39	39			39
TA No. 2
Related Party Transaction [Line Items]
Minimum Annual Rent									$ 46,765		$ 46,765	$ 46,765			$ 46,765
Number of Sites | property									38		38	38			38
TA No. 3
Related Party Transaction [Line Items]
Minimum Annual Rent									$ 49,613		$ 49,613	$ 49,613			$ 49,613
Number of Sites | property									38		38	38			38
TA No. 4
Related Party Transaction [Line Items]
Minimum Annual Rent									$ 46,297		$ 46,297	$ 46,297			$ 46,297
Number of Sites | property									38		38	38			38
TA No. 5
Related Party Transaction [Line Items]
Minimum Annual Rent									$ 62,949		$ 62,949	$ 62,949			$ 62,949
Number of Sites | property									40		40	40			40
Class A common shares | RMR Inc
Related Party Transaction [Line Items]
Shares issued in connection with acquisition | shares			5,019,121
Hotels
Related Party Transaction [Line Items]
Capital improvements from leased facilities, funded												$ 179,132
Hotels | Sonesta ES Suites
Related Party Transaction [Line Items]
Number of properties acquired | property		9
Number of hotel suites | room		1,095
Number of states hotels to be acquired located | state		8
Purchase price excluding closing cost		$ 85,000
Hotels | Sonesta ES Suites | Subsequent event
Related Party Transaction [Line Items]
Number of hotels to be acquired | property	2
Number of hotel suites | room	262
Purchase price excluding closing cost	$ 12,000
Hotels | Sonesta agreements
Related Party Transaction [Line Items]
Number of properties acquired | item							9
Fixed minimum return as a percentage of invested capital												8.00%
Up C Transaction
Related Party Transaction [Line Items]
Indirect economic interest in RMR LLC as a percent			16.20%
Up C Transaction | RMR Inc
Related Party Transaction [Line Items]
Equity conversion ratio of RMR Inc. class B-1 common stock											1
Aggregate consideration paid			$ 12,622
Up C Transaction | Common shares | RMR Inc
Related Party Transaction [Line Items]
Shares issued in connection with acquisition | shares			1,490,000
Up C Transaction | Class A common shares | RMR Inc
Related Party Transaction [Line Items]
Number of votes per equity interest | Vote											1
Shares issued in connection with acquisition | shares			5,019,121
Up C Transaction | Class B1 common shares | RMR Inc
Related Party Transaction [Line Items]
Number of votes per equity interest | Vote											10
Up C Transaction | Class B2 common shares | RMR Inc
Related Party Transaction [Line Items]
Number of votes per equity interest | Vote											10
Travel Centers of America LLC
Related Party Transaction [Line Items]
Percentage of ownership formerly held in subsidiary																	100.00%
Common shares of TA held by company as a percent of total TA shares outstanding									8.90%		8.90%	8.90%			8.90%
Number of properties acquired | property											14
Number of properties where certain assets are leased back to acquiree | property											11
Rental income									$ 65,548	55,749		$ 181,174	166,427
Capital improvements from leased facilities, funded												70,150	41,961
Increase (decrease) in minimum annual rent											$ (3,874)	5,963	3,567
Adjustments included in rental income necessary to record rent on the straight line basis									3,647	422		5,452	1,266
Accounts receivable from related parties									46,465		46,465	46,465		$ 40,253	$ 46,465
Gain on sale of real estate											11,015
Purchase price excluding closing cost									$ 279,383		$ 279,383	$ 279,383			$ 279,383
Number of common shares owned | shares									3,420,000		3,420,000	3,420,000			3,420,000
Travel Centers of America LLC | Subsequent event
Related Party Transaction [Line Items]
Purchase price excluding closing cost						$ 15,000
Travel Centers of America LLC | TA New Leases
Related Party Transaction [Line Items]
Number of properties acquired | property					14
Number of properties where certain assets are leased back to acquiree | property					11
Number of properties acquired and leased back to the acquiree | property					5
Purchase price equal to estimate of development costs, including the cost of land					$ 118,000
Purchase price excluding closing cost					$ 279,383
Travel Centers of America LLC | TA No. 5
Related Party Transaction [Line Items]
Aggregate amount of percentage rent to be waived									$ 2,500		$ 2,500	$ 2,500			$ 2,500
Annual percentage rent waived									271	126		819	372		$ 1,826
Amount of percentage rent recognized									0	557		$ 2,048	$ 2,129
Travel Centers of America LLC | TA No. 5 | Subsequent event
Related Party Transaction [Line Items]
Increase (decrease) in minimum annual rent						$ 1,275
Travel Centers of America LLC | Travel centers
Related Party Transaction [Line Items]
Number of properties acquired | property					5
RMR Trust | Up C Transaction
Related Party Transaction [Line Items]
Voting power of outstanding capital stock of RMR Inc			91.40%
Indirect economic interest in RMR LLC as a percent			51.60%
Equity conversion ratio of RMR LLC class A membership units											1
RMR Trust | Up C Transaction | Amended Agreement
Related Party Transaction [Line Items]
Window for providing notice of termination of property management agreement after change of control by the related party			12 months
Window for providing notice of termination of property management agreement for performance by the related party			60 days
Number of business days notice for termination of property management agreement for performance by the related party			60 days
Number of business days notice for termination of property management agreement for convenience by the related party			60 days
RMR Trust | Up C Transaction | RMR Inc
Related Party Transaction [Line Items]
Aggregate consideration paid			$ 11,520
RMR Trust | Up C Transaction | Managing Trustees Barry And Adam Portnoy Member
Related Party Transaction [Line Items]
Period over which shares remain under lock up and registration agreement												10 years
RMR Trust | Up C Transaction | Class A common shares
Related Party Transaction [Line Items]
Business acquisition related party equity interests delivered | shares				30,000,000
RMR Trust | Up C Transaction | Class A common shares | RMR Inc
Related Party Transaction [Line Items]
Business acquisition related party equity interests delivered | shares			15,000,000
RMR Trust | Up C Transaction | Class B1 common shares | RMR Inc
Related Party Transaction [Line Items]
Shares issued in connection with acquisition | shares			1,000,000
RMR Trust | Up C Transaction | Class B2 common shares | RMR Inc
Related Party Transaction [Line Items]
Shares issued in connection with acquisition | shares			15,000,000
RMR Trust | Up C Transaction | Class B member units | RMR Inc
Related Party Transaction [Line Items]
Shares issued in connection with acquisition | shares			1,000,000
GOV | Up C Transaction
Related Party Transaction [Line Items]
Indirect economic interest in RMR LLC as a percent			5.00%
GOV | Up C Transaction | RMR Inc
Related Party Transaction [Line Items]
Aggregate consideration paid			$ 3,917
GOV | Up C Transaction | Common shares | RMR Inc
Related Party Transaction [Line Items]
Shares issued in connection with acquisition | shares			700,000
GOV | Up C Transaction | Class A common shares | RMR Inc
Related Party Transaction [Line Items]
Shares issued in connection with acquisition | shares			1,541,201
SNH | Up C Transaction
Related Party Transaction [Line Items]
Indirect economic interest in RMR LLC as a percent			17.00%
SNH | Up C Transaction | RMR Inc
Related Party Transaction [Line Items]
Aggregate consideration paid			$ 13,967
SNH | Up C Transaction | Common shares | RMR Inc
Related Party Transaction [Line Items]
Shares issued in connection with acquisition | shares			2,345,000
SNH | Up C Transaction | Class A common shares | RMR Inc
Related Party Transaction [Line Items]
Shares issued in connection with acquisition | shares			5,272,787
SIR | Up C Transaction
Related Party Transaction [Line Items]
Indirect economic interest in RMR LLC as a percent			10.20%
SIR | Up C Transaction | RMR Inc
Related Party Transaction [Line Items]
Aggregate consideration paid			$ 15,880
SIR | Up C Transaction | Common shares | RMR Inc
Related Party Transaction [Line Items]
Shares issued in connection with acquisition | shares			880,000
SIR | Up C Transaction | Class A common shares | RMR Inc
Related Party Transaction [Line Items]
Shares issued in connection with acquisition | shares			3,166,891
RMR LLC
Related Party Transaction [Line Items]
Rental income									$ 9			$ 26
Common shares issued for services rendered by RMR | shares												52,366	97,816
Base management fee payable monthly in cash (as a percent)									100.00%		100.00%	100.00%			100.00%
Accrual for RMR LLC employee share grants									$ 776	973		$ 2,283	$ 2,199
Related party reimbursement expenses									37	19
Estimated incentive fees recorded									8,561	4,778		$ 17,383	$ 6,951
Shares issued under the business management agreement | shares												52,366	97,816
Business management fees incurred									17,392	14,309		$ 45,856	$ 34,896
RMR LLC | Up C Transaction
Related Party Transaction [Line Items]
Number of terminated management agreements for a performance reason before termination fee is incurred | agreement			1
Number of RMR LLC terminated management agreements for good cause before termination fee is incurred | agreement			1
Number of terminated management agreements for convenience before termination fee is incurred | agreement			1
RMR LLC | Up C Transaction | Amended Agreement
Related Party Transaction [Line Items]
Termination fee remaining term assumption			10 years
AIC
Related Party Transaction [Line Items]
Combined property insurance policy term								3 years
Property insurance premium								$ 2,442
Terrorism coverage of property insurance								$ 200,000
Terrorism property insurance term								1 year
Coverage of property insurance								$ 500,000
Equity in unrealized (loss) gain of an investee									(72)	(33)		(91)	8
Earnings (losses) recognized related to equity investments									(24)	$ 38		71	$ 66
Equity method investments, carrying value									$ 6,814		$ 6,814	$ 6,814			$ 6,814

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