Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
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Mortgage Loans Payable - Mortgage Loans Payable (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Mortgage loans payable	$ 19,663	$ 108,826
Mortgage Loans Payable [Member]
Debt Instrument [Line Items]
Mortgage loans payable	$ 19,663
Mortgage Loans Payable [Member] \| Winthrop Realty Trust [Member]
Debt Instrument [Line Items]
Mortgage loans payable		108,826
Mortgage Loans Payable [Member] \| Lisle IL [Member]
Debt Instrument [Line Items]
Maturity	Mar 2017
Interest Rate	5.55%
Mortgage loans payable	$ 5,216
Mortgage Loans Payable [Member] \| Lisle IL [Member] \| Winthrop Realty Trust [Member]
Debt Instrument [Line Items]
Mortgage loans payable		5,230
Mortgage Loans Payable [Member] \| Orlando FL [Member]
Debt Instrument [Line Items]
Maturity	N/A
Mortgage Loans Payable [Member] \| Orlando FL [Member] \| Winthrop Realty Trust [Member]
Debt Instrument [Line Items]
Mortgage loans payable		34,950
Mortgage Loans Payable [Member] \| Houston TX [Member]
Debt Instrument [Line Items]
Maturity	N/A
Mortgage Loans Payable [Member] \| Houston TX [Member] \| Winthrop Realty Trust [Member]
Debt Instrument [Line Items]
Mortgage loans payable		45,000
Mortgage Loans Payable [Member] \| Oklahoma City OK [Member]
Debt Instrument [Line Items]
Maturity	N/A
Mortgage Loans Payable [Member] \| Oklahoma City OK [Member] \| Winthrop Realty Trust [Member]
Debt Instrument [Line Items]
Mortgage loans payable		8,790
Mortgage Loans Payable [Member] \| 6.48% Loan Due in Apr 2018 [Member] \| Plantation FL [Member]
Debt Instrument [Line Items]
Maturity	Apr 2041
Interest Rate	6.48%
Mortgage loans payable	$ 10,091
Mortgage Loans Payable [Member] \| 6.48% Loan Due in Apr 2018 [Member] \| Plantation FL [Member] \| Winthrop Realty Trust [Member]
Debt Instrument [Line Items]
Mortgage loans payable		10,255
Mortgage Loans Payable [Member] \| 3.50% Loan Due in Aug 2024 [Member] \| Churchill [Member]
Debt Instrument [Line Items]
Maturity	Aug 2024
Interest Rate	3.50%
Mortgage loans payable	$ 4,356
Mortgage Loans Payable [Member] \| 3.50% Loan Due in Aug 2024 [Member] \| Churchill [Member] \| Winthrop Realty Trust [Member]
Debt Instrument [Line Items]
Mortgage loans payable		$ 4,601