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Equity - Additional Information (Detail) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended | 21 Months Ended |  |  |
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Jan. 13, 2021 shares | Apr. 03, 2020 $ / shares shares | Apr. 01, 2020 USD ($) security | Mar. 09, 2020 USD ($) shares | Feb. 20, 2020 shares | May 31, 2018 USD ($) $ / shares shares | Jan. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | May 18, 2021 USD ($) | May 12, 2020 USD ($) | Aug. 07, 2015 USD ($)
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock authorized and unissued (in shares) |  |  |  |  | 26,000,000 |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 3,600,000 |  |  |  |  |  |  | 63,953,993 | 65,544,073 | 63,953,993 |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  | 34,210,013 | 26,219,019 | 34,210,013 |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  |  |  | $ 233,393,000 | $ 130,348,000 | $ 241,200,000 |  |  |
Term preferred stock, fair value | $ |  |  |  |  |  |  |  | $ 4,000,000 |  | $ 4,000,000 |  |  |
Weighted-average issuance price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 19.42 |  |  |  |  |
Partners' capital account (in shares) |  |  |  |  |  |  |  |  | 288,303 |  |  |  |
OP Unit Holder |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Company's ownership percent |  |  |  |  |  |  |  | 99.40% | 100.00% | 99.40% |  |  |
Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Securities allowed for issuance (amount up to) | $ |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |
Maximum number of securities that can be sold (in securities) | security |  |  | 2 |  |  |  |  |  |  |  |  |  |
Common Stock | Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  | 12,575,252 |  | 12,575,252 |  |  |
Common stock, issued (in shares) |  |  |  |  |  |  |  |  |  | 288,303 |  |  |
Gladstone Land Limited Partnership |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
OP units held by non-controlling limited partners (in shares) |  |  |  |  |  |  |  | 204,778 | 0 |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  |  |  | 3,493,333 | 1,088,435 | 3,493,333 |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  |  |  |  | 25,989,942 | 25,999,862 | 25,989,942 |  |  |
Redemption of preferred stock | $ |  |  |  |  |  |  |  | $ 248,000 | $ 3,000 |  |  |  |
Series C Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  | 6.00% |  |  | 6.00% |  |  |  |  |  |  |  |
Maximum amount authorized in Primary Offering (in shares) |  | 26,000,000 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.001 |  |  |  |  |  |  |  |  |  |  |
Average sales price of common stock sold (in dollars per share) | $ / shares |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |
Gross proceeds | $ |  |  |  |  |  |  |  | $ 59,720,000 | $ 26,987,000 |  |  |  |
Preferred stock, shares authorized (in shares) |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |
Sale of stock pursuant to DRIP (in dollars per share) | $ / shares |  | $ 22.75 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized, pursuant to DRIP (in shares) |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Redemptions of Series B Preferred Stock (in shares) |  |  |  |  |  |  |  | 9,920 | 138 |  |  |  |
Redemption of preferred stock | $ |  |  |  |  |  |  |  | $ 248,000 | $ 3,000 |  |  |  |
Consideration received on transaction | $ |  |  |  |  |  |  |  | 704,000 |  |  |  |  |
Costs incurred | $ |  |  |  |  |  |  |  | $ 54,760,000 | $ 24,759,000 |  |  |  |
Series C Preferred Stock | Preferred Stock | Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  | 3,503,391 |  | 3,503,391 |  |  |
Series C Preferred Stock | Preferred Stock | Series C Termination |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |
Series C Preferred Stock | Common Stock | Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  |  |  |  |  | $ 86,900,000 |  |  |
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  |  | 2,415,000 | 2,415,000 | 0 | 2,415,000 |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  |  |  |  | 3,600,000 | 0 | 3,600,000 |  |  |
Series D Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate | 5.00% |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  |  | $ 58,300,000 |  |  |  |  |  |
Series D Preferred Stock | Preferred Stock | Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  |  |  |  |  | $ 60,400,000 |  |  |
Series D Preferred Stock | Common Stock | Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  |  |  | 2,415,000 |  | 2,415,000 |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  |  |  | 5,956,065 |  | 5,956,065 |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  |  |  |  | 6,456,065 | 6,456,065 | 6,456,065 |  |  |
Redemption of preferred stock | $ |  |  |  |  |  |  |  |  | $ 681,000 |  |  |  |
Series B Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  | 6.00% |  |  |  |  |  |  |
Securities allowed for issuance (amount up to) | $ |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |
Maximum amount authorized in Primary Offering (in shares) |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |
Average sales price of common stock sold (in dollars per share) | $ / shares |  |  |  |  |  | $ 25.00 |  |  |  |  |  |  |
Redemptions of Series B Preferred Stock (in shares) |  |  |  |  |  |  |  |  | 29,335 |  |  |  |
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) |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |
Gross proceeds | $ |  |  |  | $ 133,400,000 |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, value authorized | $ |  |  |  |  |  |  |  |  |  |  |  | $ 260,000,000 |
Common Stock | ATM Program |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds | $ |  |  |  |  |  |  |  | $ 173,428,000 | $ 45,883,000 |  |  |  |
Costs incurred | $ |  |  |  |  |  |  |  | $ 171,693,000 | 45,424,000 |  |  |  |
Common stock, value authorized | $ |  |  |  |  |  |  |  |  |  |  | $ 160,000,000 | $ 100,000,000 | $ 30,000,000
Common Stock | Follow-on Offerings |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds | $ |  |  |  |  |  |  |  |  | 27,300,000 |  |  |  |
Costs incurred | $ |  |  |  |  |  |  |  |  | $ 26,100,000 |  |  |  |

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