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

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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 210
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Mortgage Loans Payable - Mortgage Loans Payable (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Mortgage loans payable	$ 3,979	$ 19,663
Mortgage Loans Payable [Member]
Debt Instrument [Line Items]
Mortgage loans payable	$ 3,979
Mortgage Loans Payable [Member] \| Winthrop Realty Trust [Member]
Debt Instrument [Line Items]
Mortgage loans payable		19,663
Mortgage Loans Payable [Member] \| Lisle IL [Member]
Debt Instrument [Line Items]
Maturity	Mar 2017
Mortgage Loans Payable [Member] \| Lisle IL [Member] \| Winthrop Realty Trust [Member]
Debt Instrument [Line Items]
Mortgage loans payable		5,216
Mortgage Loans Payable [Member] \| Plantation FL [Member]
Debt Instrument [Line Items]
Maturity	Apr 2041
Mortgage Loans Payable [Member] \| Plantation FL [Member] \| Winthrop Realty Trust [Member]
Debt Instrument [Line Items]
Mortgage loans payable		10,091
Mortgage Loans Payable [Member] \| 5.78% Loan Due in Aug 2024 [Member] \| Churchill [Member]
Debt Instrument [Line Items]
Maturity	Aug 2024
Interest Rate	5.78%
Mortgage loans payable	$ 3,979
Mortgage Loans Payable [Member] \| 5.78% Loan Due in Aug 2024 [Member] \| Churchill [Member] \| Winthrop Realty Trust [Member]
Debt Instrument [Line Items]
Mortgage loans payable		$ 4,356