Quarterly report pursuant to Section 13 or 15(d)

Mortgages Payable and Debt Maturities - Summary of Mortgage Payable (Detail)

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Mortgages Payable and Debt Maturities - Summary of Mortgage Payable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Mortgages payable $ 12,204 $ 12,302
4.98% Mortgage Note Due January 1, 2021 [Member]    
Debt Instrument [Line Items]    
Mortgages payable 2,849 2,863
4.065% Mortgage Note Due April 1, 2023 [Member]    
Debt Instrument [Line Items]    
Mortgages payable 4,004 4,028
5.26% Mortgage Note Due November 1, 2023 [Member]    
Debt Instrument [Line Items]    
Mortgages payable 3,853 3,871
5.99% Mortgage Note Due May 1, 2026 [Member]    
Debt Instrument [Line Items]    
Mortgages payable $ 1,498 $ 1,540