Gladstone Land Corporation Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Equity - Additional Information (Detail)

Equity - Additional Information (Detail)							12 Months Ended		45 Months Ended
Equity - Additional Information (Detail)	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