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Revenue Recognition - Advisory Agreements (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2018	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Advisory fees			$ 1,382	$ 1,010
Management services revenue			$ 48,570	42,727
RIF
Related Party Transaction [Line Items]
Advisory fee percent			0.85%
RMR Advisors and Tremont Advisors
Related Party Transaction [Line Items]
Advisory fees			$ 729	606
Tremont Advisors
Related Party Transaction [Line Items]
Advisory fees			653	404
Management services revenue			$ 238	$ 206
Tremont Advisors
Related Party Transaction [Line Items]
Advisory fee percentage based on weighted average outstanding balance of strategic investments			1.35%
Advisory fee percentage based on outstanding principal balance of outstanding loans			0.50%
Business management fee percent based on management agreements			1.50%
Minimum | Tremont Advisors
Related Party Transaction [Line Items]
Advisory fee percentage based on aggregate principal amounts of loan originate			0.50%
Maximum | Tremont Advisors
Related Party Transaction [Line Items]
Advisory fee percentage based on aggregate principal amounts of loan originate			1.00%
Subsequent event | Tremont Advisors
Related Party Transaction [Line Items]
Advisory fee percentage based on weighted average outstanding balance of strategic investments	0.35%
Forecast | Tremont Advisors
Related Party Transaction [Line Items]
Advisory fee percent		20.00%
Advisory fee percentage		7.00%

X

- Definition

Advisory Fee, Annual Revenue Earned, Percent of Outstanding Principal Balance of Outstanding Loans

+ References

No definition available.

+ Details

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- Definition

Advisory Fee, Annual Revenue Earned, Percent of Weighted Average Outstanding Balance of Investments

+ References

No definition available.

+ Details

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X

- Definition

Represents the advisory fee percentage based on the daily managed assets.

+ References

No definition available.

+ Details

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X

- Definition

Advisory Fee, Revenue Earned, Percent of Aggregate Principal Amounts of Loans Originated

+ References

No definition available.

+ Details

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- Definition

Base Management Advisory Fee Percentage

+ References

No definition available.

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X

- Definition

Represents the business management fee percentage based on the business management agreements.

+ References

No definition available.

+ Details

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X

- Definition

Amount of fees earned from providing investment advice and research to customers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(a),(d))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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X

- Definition

Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations.

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

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- 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.

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