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Debt - Mortgage Loans Payable (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Mortgage loans payable $ 108,826  
Winthrop Realty Trust [Member]    
Debt Instrument [Line Items]    
Mortgage loans payable   $ 172,095
Mortgage Loans Payable [Member]    
Debt Instrument [Line Items]    
Mortgage loans payable $ 108,826  
Mortgage Loans Payable [Member] | Winthrop Realty Trust [Member]    
Debt Instrument [Line Items]    
Mortgage loans payable   172,095
Mortgage Loans Payable [Member] | Chicago, IL [Member]    
Debt Instrument [Line Items]    
Maturity N/A  
Loan bears interest, description of variable rate basis -  
Mortgage Loans Payable [Member] | Chicago, IL [Member] | Winthrop Realty Trust [Member]    
Debt Instrument [Line Items]    
Mortgage loans payable   19,104
Mortgage Loans Payable [Member] | Greensboro, North Carolina Sale [Member]    
Debt Instrument [Line Items]    
Maturity N/A  
Loan bears interest, description of variable rate basis -  
Mortgage Loans Payable [Member] | Greensboro, North Carolina Sale [Member] | Winthrop Realty Trust [Member]    
Debt Instrument [Line Items]    
Mortgage loans payable   13,600
Mortgage Loans Payable [Member] | Lisle IL [Member]    
Debt Instrument [Line Items]    
Maturity N/A  
Loan bears interest, description of variable rate basis -  
Mortgage Loans Payable [Member] | Lisle IL [Member] | Winthrop Realty Trust [Member]    
Debt Instrument [Line Items]    
Mortgage loans payable   5,459
Mortgage Loans Payable [Member] | Stamford, CT [Member]    
Debt Instrument [Line Items]    
Maturity N/A  
Loan bears interest, description of variable rate basis -  
Mortgage Loans Payable [Member] | Stamford, CT [Member] | Winthrop Realty Trust [Member]    
Debt Instrument [Line Items]    
Mortgage loans payable   33,448
Mortgage Loans Payable [Member] | Houston TX [Member]    
Debt Instrument [Line Items]    
Maturity N/A  
Loan bears interest, description of variable rate basis -  
Mortgage Loans Payable [Member] | Houston TX [Member] | Winthrop Realty Trust [Member]    
Debt Instrument [Line Items]    
Mortgage loans payable   44,319
Mortgage Loans Payable [Member] | 5.55% Loan Due in Mar 2017 [Member] | Lisle IL [Member]    
Debt Instrument [Line Items]    
Maturity Mar 2017  
Loan bears interest, description of variable rate basis -  
Interest Rate 5.55%  
Mortgage loans payable $ 5,230  
Mortgage Loans Payable [Member] | 5.55% Loan Due in Mar 2017 [Member] | Lisle IL [Member] | Winthrop Realty Trust [Member]    
Debt Instrument [Line Items]    
Mortgage loans payable   5,309
Mortgage Loans Payable [Member] | 6.40% Loan Due in Jul 2017 [Member] | Orlando FL [Member]    
Debt Instrument [Line Items]    
Maturity Jul 2017  
Loan bears interest, description of variable rate basis -  
Interest Rate 6.40%  
Mortgage loans payable $ 34,950  
Mortgage Loans Payable [Member] | 6.40% Loan Due in Jul 2017 [Member] | Orlando FL [Member] | Winthrop Realty Trust [Member]    
Debt Instrument [Line Items]    
Mortgage loans payable   35,668
Mortgage Loans Payable [Member] | 6.48% Loan Due in Apr 2018 [Member] | Plantation FL [Member]    
Debt Instrument [Line Items]    
Maturity Apr 2018  
Loan bears interest, description of variable rate basis -  
Interest Rate 6.48%  
Mortgage loans payable $ 10,255  
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   10,406
Mortgage Loans Payable [Member] | 3.22% Loan Due in Jun 2018 [member] | Houston TX [Member]    
Debt Instrument [Line Items]    
Maturity Jun 2018  
Loan bears interest, description of variable rate basis Libor + 2.75%  
Interest Rate 3.52%  
Mortgage loans payable $ 45,000  
Mortgage Loans Payable [Member] | 5.70% Loan Due in Feb 2021 [Member] | Oklahoma City OK [Member]    
Debt Instrument [Line Items]    
Maturity Feb 2021  
Loan bears interest, description of variable rate basis -  
Interest Rate 5.70%  
Mortgage loans payable $ 8,790  
Mortgage Loans Payable [Member] | 3.50% Loan Due in Aug 2024 [Member] | Churchill [Member]    
Debt Instrument [Line Items]    
Maturity Aug 2024  
Loan bears interest, description of variable rate basis -  
Interest Rate 3.50%  
Mortgage loans payable $ 4,601  
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   $ 4,782