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Equity - Additional Information (Detail) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 13, 2017 shares | Oct. 06, 2017 shares | Sep. 29, 2017 USD ($) $ / shares shares | Sep. 20, 2017 shares | Sep. 12, 2017 USD ($) $ / shares shares | Jul. 12, 2017 $ / shares shares | Apr. 12, 2017 USD ($) security | Mar. 22, 2017 USD ($) shares | Mar. 13, 2017 USD ($) $ / shares shares | Nov. 07, 2017 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares | Mar. 31, 2017 USD ($) shares | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) shares | Dec. 31, 2016 $ / shares shares | Jul. 17, 2017 shares | Dec. 31, 2015 shares | Aug. 07, 2015 USD ($)
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  | 100,000,000 |  |  |  |  | 98,000,000 |  | 98,000,000 | 98,000,000 |  | 18,000,000 | 20,000,000 |  |
Increase in shares authorized (in shares) |  |  |  |  |  | 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 |  |  |  |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  | $ 0.001 |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  |  | 13,485,025 |  | 13,485,025 | 13,485,025 |  | 10,024,875 |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  | 13,485,025 |  | 13,485,025 | 13,485,025 |  | 10,024,875 |  |  |
Price per share of OP units redeemed for cash (in dollars per share) | $ / shares |  |  | $ 13.21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of securities that can be sold (in securities) | security |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of equity | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40,421,000 | $ 360,000 |  |  |  |
2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of equity | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,700,000 |  |  |  |  |  |
2014 Registration Statement | General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Professional fees and stockholder-related expenses | $ |  |  |  |  |  |  |  |  |  |  |  | $ 46,000 |  |  |  |  |  |  |
Public offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock sold under sale agreement (in shares) |  |  |  |  | 1,150,000 |  |  |  | 1,680,000 |  |  |  |  |  |  |  |  |  |
Average sales price of common stock sold (in dollars per share) | $ / shares |  |  |  |  | $ 12.25 |  |  |  | $ 11.35 |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ |  |  |  |  | $ 14,100,000 |  |  |  | $ 19,100,000 |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock | $ |  |  |  |  | $ 13,400,000 |  |  |  | $ 18,000,000 |  |  |  |  |  |  |  |  |  |
Over-allotment option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock sold under sale agreement (in shares) |  |  |  |  | 150,000 |  |  | 145,749 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ |  |  |  |  |  |  |  | $ 1,700,000 |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock | $ |  |  |  |  |  |  |  | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |
ATM Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  |  | 498,962 |  | 498,962 | 498,962 |  |  |  |  |
Sale of common stock sold under sale agreement (in shares) |  |  |  |  |  |  |  |  |  |  | 434,401 |  |  | 434,401 |  |  |  |  |
Common stock, value authorized | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000,000.0
Average sales price price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 12.57 |  | $ 12.57 | $ 12.57 |  |  |  |  |
Common stock, value, outstanding | $ |  |  |  |  |  |  |  |  |  |  | $ 6,300,000 |  | $ 6,300,000 | $ 6,300,000 |  |  |  |  |
Common stock, value, issued | $ |  |  |  |  |  |  |  |  |  |  | $ 6,200,000 |  | $ 6,200,000 | $ 6,200,000 |  |  |  |  |
At Market Program 2017 Issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average sales price price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 12.92 |  | $ 12.92 | $ 12.92 |  |  |  |  |
Common stock, value, outstanding | $ |  |  |  |  |  |  |  |  |  |  | $ 5,600,000 |  | $ 5,600,000 | $ 5,600,000 |  |  |  |  |
Common stock, value, issued | $ |  |  |  |  |  |  |  |  |  |  | $ 5,500,000 |  | $ 5,500,000 | $ 5,500,000 |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  | 13,485,025.000 |  | 13,485,025.000 | 13,485,025.000 | 10,024,875 | 10,024,875 |  | 9,992,941 |
Common Stock | 2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities allowed for issuance (amount up to) | $ |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock | 2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  |  | 1,584,401 |  | 1,584,401 | 1,584,401 |  |  |  |  |
Preferred Stock | 2014 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,150,000 |  |  |  |  |  |  |
Limited Partner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OP units redeemed for common stock (in shares) |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event | ATM Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock sold under sale agreement (in shares) | 121,875 |  |  |  |  |  |  |  |  | 31,038 |  |  |  |  |  |  |  |  |
Average sales price of common stock sold (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 13.39 |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ |  |  |  |  |  |  |  |  |  | $ 409,000 |  |  |  |  |  |  |  |  |
OP Unit Holder |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum ownership period require to redeem units |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |
Conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Gladstone Land Limited Partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's ownership percent (as percent) |  |  |  |  |  |  |  |  |  |  | 91.70% |  | 91.70% | 91.70% |  | 87.40% |  |  |
OP units held by non-controlling limited partners (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,227,383 |  | 1,449,258 |  |  |
OP units held by non-controlling interest limited partners (in shares) |  |  |  |  |  |  |  |  |  |  | 993,431 |  | 993,431 | 993,431 |  | 0 |  |  |
Gladstone Land Limited Partnership | Limited Partner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OP units redeemed (in shares) |  |  |  | 221,875 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OP units redeemed for cash (in shares) |  |  | 171,875 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OP units redeemed for cash | $ |  |  | $ 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gladstone Land Limited Partnership | Subsequent event | Limited Partner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OP units redeemed (in shares) |  | 121,875 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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