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Mortgage Notes Payable, Line of Credit and Term Loan Facility - Summary of Long-Term Mortgages (Detail) - USD ($) $ in Thousands | 9 Months Ended
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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% |

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