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Equity - Additional Information (Detail) |  |  |  |  |  |  | 12 Months Ended | 45 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 03, 2020 $ / shares shares | Apr. 01, 2020 USD ($) security | Mar. 05, 2020 USD ($) shares | Feb. 20, 2020 $ / shares shares | May 31, 2018 USD ($) $ / shares shares | Apr. 12, 2017 USD ($) security | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | May 12, 2020 USD ($) | Feb. 19, 2020 shares | Aug. 07, 2015 USD ($)
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock authorized and unissued (in shares) | shares |  |  |  | 26,000,000 |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  |  |  | 65,500,000 |  |  | 65,544,073 | 91,514,600 | 65,544,073 |  | 91,500,000 |
Common stock, shares issued (in shares) | shares |  |  |  |  |  |  | 26,219,019 | 20,936,658 | 26,219,019 |  |  |
Proceeds from issuance of preferred and common equity |  |  |  |  |  |  | $ 130,348,000 | $ 118,357,000 |  |  |  |
2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of securities that can be sold (in securities) | security |  |  |  |  |  | 2 |  |  |  |  |  |
Proceeds from issuance of preferred and common equity |  |  |  |  |  |  |  |  | $ 117,400,000 |  |  |
Registration Statement |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of securities that can be sold (in securities) | security |  | 2 |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity |  |  |  |  |  |  | 67,800,000 |  |  |  |  |
Write off of deferred rent receivable |  |  |  |  |  |  | $ 29,000 |  |  |  |  |
Common Stock | 2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Securities allowed for issuance (amount up to) |  |  |  |  |  | $ 300,000,000.0 |  |  |  |  |  |
Common stock, shares issued (in shares) | shares |  |  |  |  |  |  | 9,495,834 |  | 9,495,834 |  |  |
Common stock, issued (in shares) | shares |  |  |  |  |  |  |  |  | 1,215,565 |  |  |
Common Stock | Registration Statement |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Securities allowed for issuance (amount up to) |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) | shares |  |  |  |  |  |  | 4,584,258 |  | 4,584,258 |  |  |
Common stock, issued (in shares) | shares |  |  |  |  |  |  | 288,303 |  |  |  |  |
Gladstone Land Limited Partnership |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
OP units held by non-controlling limited partners (in shares) | shares |  |  |  |  |  |  | 0 | 288,303 |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |
Preferred stock, shares authorized (in shares) | shares |  |  |  |  |  |  | 6,456,065 | 6,485,400 | 6,456,065 |  |  |
Series B Preferred Stock | 2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity |  |  |  |  |  |  |  |  | $ 147,500,000 |  |  |
Series B Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate (as percent) |  |  |  |  | 6.00% |  |  |  |  |  |  |
Securities allowed for issuance (amount up to) |  |  |  |  | $ 150,000,000.0 |  |  |  |  |  |  |
Maximum amount authorized in Primary Offering (in shares) | shares |  |  |  |  | 6,000,000 |  |  |  |  |  |  |
Average sales price of common stock sold (in dollars per share) | $ / shares |  |  |  |  | $ 25.00 |  |  |  |  |  |  |
Gross Proceeds |  |  |  |  |  |  | $ 30,148,000 | $ 89,232,000 |  |  |  |
Costs incurred |  |  |  |  |  |  | $ 27,664,000 | 81,587,000 |  |  |  |
Series B Preferred Stock | Preferred Stock | 2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) | shares |  |  |  |  |  |  | 6,000,000 |  | 6,000,000 |  |  |
Series B Preferred Stock | Preferred Stock | Series B Termination |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Securities allowed for issuance (amount up to) |  |  | $ 147,500,000 |  |  |  |  |  |  |  |  |
Maximum amount authorized in Primary Offering (in shares) | shares |  |  | 6,000,000 |  |  |  |  |  |  |  |  |
Gross Proceeds |  |  | $ 133,400,000 |  |  |  |  |  |  |  |  |
Costs incurred |  |  | $ 1,600,000 |  |  |  |  |  |  |  |  |
Common Stock | ATM Program |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds |  |  |  |  |  |  | $ 45,883,000 | 2,413,000 |  |  |  |
Costs incurred |  |  |  |  |  |  | $ 45,424,000 | $ 2,377,000 |  |  |  |
Common stock, value authorized |  |  |  |  |  |  |  |  |  | $ 100,000,000.0 |  | $ 30,000,000.0
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |
Preferred stock, shares authorized (in shares) | shares |  |  |  |  |  |  | 25,999,862 | 0 | 25,999,862 |  |  |
Series C Preferred Stock | Registration Statement |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity |  |  |  |  |  |  | $ 27,000,000.0 |  |  |  |  |
Series C Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate (as percent) |  |  |  | 6.00% |  |  |  |  |  |  |  |
Maximum amount authorized in Primary Offering (in shares) | shares | 26,000,000 |  |  | 400,000 |  |  |  |  |  |  |  |
Average sales price of common stock sold (in dollars per share) | $ / shares | $ 25.00 |  |  | $ 25.00 |  |  |  |  |  |  |  |
Gross Proceeds |  |  |  |  |  |  | 26,987,000 |  |  |  |  |
Costs incurred |  |  |  |  |  |  | 24,759,000 |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.001 |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | shares | 20,000,000 |  |  | 120,000 |  |  |  |  |  |  |  |
Sale of stock pursuant to DRIP (in dollars per share) | $ / shares | $ 22.75 |  |  | $ 22.75 |  |  |  |  |  |  |  |
Preferred stock, shares authorized, pursuant to DRIP (in shares) | shares | 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Consideration received on transaction |  |  |  |  |  |  | $ 282,000 |  |  |  |  |
Series C Preferred Stock | Preferred Stock | Registration Statement |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) | shares |  |  |  |  |  |  | 1,088,573 |  | 1,088,573 |  |  |
Series C Preferred Stock | Preferred Stock | Series C Termination |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | shares | 20,000,000 |  |  |  |  |  |  |  |  |  |  |
OP Unit Holder |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company's ownership percent (as percent) |  |  |  |  |  |  | 100.00% | 98.60% | 100.00% |  |  |
Minimum period required to exercise, in months |  |  |  |  |  |  | 12 months |  |  |  |  |

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