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Equity - Additional Information (Detail) - USD ($) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 17, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Aug. 07, 2015 | Apr. 02, 2014 | Dec. 31, 2013
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  | 18,000,000 | 20,000,000 |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.001 | $ 0.001 |  |  |  |
Common stock, shares issued (in shares) |  | 10,024,875 | 9,992,941 |  |  |  |
Common stock, shares outstanding (in shares) |  | 10,024,875 | 9,992,941 |  |  |  |
Operating partnership units held by anyone other than Company (in shares) |  |  | 0 | 0 |  |  |
Payments of dividends |  | $ 5,000,000 | $ 4,100,000 | $ 2,500,000 |  |  |
Securities allowed for issuance |  |  |  |  |  | $ 300,000,000 |
Proceeds from issuance of mandatorily-redeemable preferred stock |  | $ 28,750,000 | $ 0 | $ 0 |  |  |
Common Stock |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  | 10,024,875 | 9,992,941 | 7,753,717 |  |  | 6,530,264
Value of common stock issuable per registration statement |  | $ 23,600,000 |  |  |  |  |
Number of shares issued (in shares) |  | 31,934 | 2,239,224 | 1,223,453 |  |  |
Universal Registration Statement | Common Stock |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  | 2,188,014 |  |  |  |  |
At-the-Market Program |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  | 64,561 |  |  |  |  |
Common stock, value authorized |  |  |  |  | $ 30,000,000.0 |  |
Sale of common stock sold under sale agreement (in shares) |  | 31,934 |  |  |  |  |
Average sales price of common stock sold (in dollars per share) |  | $ 11.29 |  |  |  |  |
Gross proceeds from issuance of common stock |  | $ 360,000 |  |  |  |  |
Net proceeds from issuance of common stock |  | $ 355,000 |  |  |  |  |
Average sales price (in dollars per share) |  | $ 10.23 |  |  |  |  |
Gross proceeds from shares issued |  | $ 660,000 |  |  |  |  |
Net proceeds from shares issued |  | $ 650,000 |  |  |  |  |
Series A cumulative term preferred stock |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Number of shares issued (in shares) | 1,000,000 | 1,150,000 |  |  |  |  |
Average sales price (in dollars per share) | $ 25 |  |  |  |  |  |
Gladstone Land Limited Partnership |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Company's ownership percent of voting securities of Land Advisers |  | 87.40% | 100.00% |  |  |  |
Operating partnership units held by anyone other than Company (in shares) |  | 1,449,258 |  |  |  |  |

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