Quarterly report pursuant to Section 13 or 15(d)

Mortgage Notes Payable, Line of Credit and Term Loan Facility - Summary of Long-Term Mortgages (Detail)

v3.5.0.2
Mortgage Notes Payable, Line of Credit and Term Loan Facility - Summary of Long-Term Mortgages (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Debt Instrument [Line Items]    
Proceeds from Notes Payable $ 56,005 $ 61,059
Principal Balance Repaid $ 67,119 $ 37,216
Previous Weighted Average 4.47%  
Mortgage Notes Payable [Member]    
Debt Instrument [Line Items]    
Date of Issuance Apr. 28, 2016  
Previous Weighted Average 4.71%  
Mortgage Notes Payable [Member] | First Niagara Bank [Member]    
Debt Instrument [Line Items]    
Date of Issuance Mar. 01, 2016  
Issuing Bank Key Bank  
Proceeds from Notes Payable $ 18,475  
Libor rate description LIBOR + 2.35%  
Maturity Date Mar. 01, 2023  
Principal Balance Repaid $ 21,197  
Previous Weighted Average 6.14%  
Mortgage Notes Payable [Member] | Great Southern Bank [Member]    
Debt Instrument [Line Items]    
Date of Issuance Apr. 22, 2016  
Issuing Bank Great Southern Bank  
Proceeds from Notes Payable $ 9,530  
Libor rate description LIBOR + 2.75%  
Maturity Date Apr. 22, 2019  
Principal Balance Repaid $ 3,667  
Previous Weighted Average 6.25%  
Mortgage Notes Payable [Member] | Gladstone Commercial [Member]    
Debt Instrument [Line Items]    
Principal Balance Repaid $ 22,510  
Previous Weighted Average 6.34%  
Mortgage Notes Payable [Member] | Prudential [Member]    
Debt Instrument [Line Items]    
Date of Issuance May 26, 2016  
Issuing Bank Prudential  
Proceeds from Notes Payable $ 9,900  
Spread on LIBOR 4.684%  
Maturity Date Jun. 01, 2026  
Mortgage Notes Payable [Member] | Gladstone Commercial Two [Member]    
Debt Instrument [Line Items]    
Date of Issuance Sep. 01, 2016  
Principal Balance Repaid $ 12,677  
Previous Weighted Average 5.76%  
Mortgage Notes Payable [Member] | Union Fidelity Life Insurance [Member]    
Debt Instrument [Line Items]    
Date of Issuance Sep. 12, 2016  
Issuing Bank Union Fidelity Life Insurance Company  
Proceeds from Notes Payable $ 14,100  
Libor rate description 0.0425  
Maturity Date Oct. 05, 2026  
Mortgage Notes Payable [Member] | Huntington Bank [Member]    
Debt Instrument [Line Items]    
Date of Issuance Sep. 30, 2016  
Issuing Bank Huntington Bank  
Proceeds from Notes Payable $ 4,000  
Libor rate description LIBOR + 2.50%  
Maturity Date Sep. 30, 2018  
Maturity Date One [Member] | First Niagara Bank [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Spread on LIBOR 2.35%  
Maturity Date One [Member] | Great Southern Bank [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Spread on LIBOR 2.75%