Gladstone Land Corporation Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Equity - Additional Information (Detail)

Equity - Additional Information (Detail)											3 Months Ended	5 Months Ended	6 Months Ended		12 Months Ended	15 Months Ended
Equity - Additional Information (Detail)	Jun. 13, 2018 shares	Jun. 12, 2018 shares	May 31, 2018 USD ($) $ / shares shares	May 11, 2018 USD ($) $ / shares shares	May 04, 2018 shares	Apr. 04, 2018 USD ($) shares	Mar. 27, 2018 USD ($) $ / shares shares	Jan. 17, 2018 USD ($) $ / shares shares	Jan. 16, 2018 shares	Apr. 12, 2017 USD ($) security	Jun. 30, 2018 USD ($) $ / shares shares	May 31, 2018 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($)	Dec. 31, 2017 $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Jan. 10, 2018 shares	Jan. 09, 2018 shares	Aug. 07, 2015 USD ($)
Subsidiary, Sale of Stock [Line Items]
Stock authorized and unissued (in shares)																	6,500,000
Common stock, shares authorized (in shares)											91,500,000		91,500,000		98,000,000	91,500,000		98,000,000
Preferred stock, shares authorized (in shares)											6,500,000		6,500,000		0	6,500,000
Preferred stock par value (in dollars per share) \| $ / shares											$ 0.001		$ 0.001		$ 0	$ 0.001
Preferred stock, shares outstanding (in shares)											20,280		20,280		0	20,280
Preferred stock, shares issued (in shares)											20,280		20,280		0	20,280
Preferred stock, liquidation value \| $											$ 507,000		$ 507,000			$ 507,000
Common stock, par value (in dollars per share) \| $ / shares											$ 0.001		$ 0.001		$ 0.001	$ 0.001
Common stock, shares issued (in shares)											16,023,872		16,023,872		13,791,574	16,023,872
Price per share of OP units redeemed for cash (in dollars per share) \| $ / shares				$ 12.54				$ 13.42
Maximum number of securities that can be sold (in securities) \| security										2
Proceeds from issuance of common and preferred equity \| $													$ 25,113,000	$ 20,722,000
Average sales price of common stock sold (in dollars per share) \| $ / shares							$ 12.15
Discounts and offering expenses \| $							$ 12,700,000						$ 935,000	$ 1,225,000
2017 Registration Statement
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of common and preferred equity \| $																$ 45,800,000
Secondary Public Stock Offering
Subsidiary, Sale of Stock [Line Items]
Net proceeds from issuance of stock \| $							$ 13,400,000
Sale of common stock sold under sale agreement (in shares)							1,100,000
Over-allotment option
Subsidiary, Sale of Stock [Line Items]
Discounts and offering expenses \| $						$ 1,900,000
Net proceeds from issuance of stock \| $						$ 2,000,000
Sale of common stock sold under sale agreement (in shares)						165,000
ATM Program
Subsidiary, Sale of Stock [Line Items]
Common stock, shares issued (in shares)											1,324,667		1,324,667			1,324,667
Common stock, value authorized \| $																			$ 30,000,000.0
Sale of common stock sold under sale agreement (in shares)													716,031
Average sales price price (in dollars per share) \| $ / shares											$ 12.83		$ 12.83			$ 12.83
Common stock, value, outstanding \| $											$ 17,000,000		$ 17,000,000			$ 17,000,000
Common stock, value, issued \| $											$ 16,700,000		16,700,000			$ 16,700,000
At Market Program 2017 Issuances
Subsidiary, Sale of Stock [Line Items]
Discounts and offering expenses \| $													9,100,000
Net proceeds from issuance of stock \| $													$ 9,200,000
Average sales price price (in dollars per share) \| $ / shares											$ 12.90		$ 12.90			$ 12.90
Common Stock \| 2017 Registration Statement
Subsidiary, Sale of Stock [Line Items]
Common stock, shares issued (in shares)											3,675,106		3,675,106			3,675,106
Common stock issued (in shares)																544,686
Securities allowed for issuance (amount up to) \| $										$ 300,000,000
Preferred Stock \| 2017 Registration Statement
Subsidiary, Sale of Stock [Line Items]
Preferred stock, shares outstanding (in shares)											20,280		20,280			20,280
Preferred stock, shares issued (in shares)											20,280		20,280			20,280
Proceeds from issuance of common and preferred equity \| $											$ 507,000
Discounts and offering expenses \| $											$ 456,000
Limited Partner
Subsidiary, Sale of Stock [Line Items]
OP units redeemed for common stock (in shares)	233,952			9,615				7,700
Gladstone Land Limited Partnership
Subsidiary, Sale of Stock [Line Items]
Company's ownership percent (as percent)											95.70%		95.70%		93.20%	95.70%
OP units held by non-controlling limited partners (in shares)													717,423		1,008,105
OP units held by non-controlling interest limited partners (in shares)											717,423		717,423			717,423
Gladstone Land Limited Partnership \| Limited Partner
Subsidiary, Sale of Stock [Line Items]
OP units redeemed (in shares)		233,952			19,230				37,500
Common stock issued (in shares)	233,952			9,615				7,700
OP units redeemed for cash (in shares)				9,615				29,800
OP units redeemed for cash \| $				$ 121,000				$ 400,000
Series B Preferred Stock \| Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Securities allowed for issuance (amount up to) \| $			$ 150,000,000									$ 150,000,000
Maximum amount authorized in Primary Offering (in shares)			6,000,000
Dividend rate (as percent)			6.00%
Average sales price of common stock sold (in dollars per share) \| $ / shares			$ 25									$ 25
Proceeds from issuance of preferred stock \| $			$ 131,300,000
Discounts and offering expenses \| $													$ 393,000
Sale of common stock sold under sale agreement (in shares)												0
OP Unit Holder
Subsidiary, Sale of Stock [Line Items]
Minimum period required to exercise, in months													12 months