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)										1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
Equity - Additional Information (Detail)	Oct. 13, 2017 shares	Oct. 06, 2017 shares	Sep. 29, 2017 USD ($) $ / shares shares	Sep. 20, 2017 shares	Sep. 12, 2017 USD ($) $ / shares shares	Jul. 12, 2017 $ / shares shares	Apr. 12, 2017 USD ($) security	Mar. 22, 2017 USD ($) shares	Mar. 13, 2017 USD ($) $ / shares shares	Nov. 07, 2017 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Mar. 31, 2017 USD ($) shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) shares	Dec. 31, 2016 $ / shares shares	Jul. 17, 2017 shares	Dec. 31, 2015 shares	Aug. 07, 2015 USD ($)
Subsidiary, Sale of Stock [Line Items]
Common stock, shares authorized (in shares)						100,000,000					98,000,000		98,000,000	98,000,000		18,000,000	20,000,000
Increase in shares authorized (in shares)						80,000,000
Common stock, par value (in dollars per share) \| $ / shares						$ 0.001					$ 0.001		$ 0.001	$ 0.001		$ 0.001
Common stock, shares issued (in shares)											13,485,025		13,485,025	13,485,025		10,024,875
Common stock, shares outstanding (in shares)											13,485,025		13,485,025	13,485,025		10,024,875
Price per share of OP units redeemed for cash (in dollars per share) \| $ / shares			$ 13.21
Maximum number of securities that can be sold (in securities) \| security							2
Proceeds from issuance of equity \| $														$ 40,421,000	$ 360,000
2017 Registration Statement
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of equity \| $													$ 19,700,000
2014 Registration Statement \| General and administrative expenses
Subsidiary, Sale of Stock [Line Items]
Professional fees and stockholder-related expenses \| $												$ 46,000
Public offering
Subsidiary, Sale of Stock [Line Items]
Sale of common stock sold under sale agreement (in shares)					1,150,000				1,680,000
Average sales price of common stock sold (in dollars per share) \| $ / shares					$ 12.25				$ 11.35
Proceeds from issuance of common stock \| $					$ 14,100,000				$ 19,100,000
Net proceeds from issuance of common stock \| $					$ 13,400,000				$ 18,000,000
Over-allotment option
Subsidiary, Sale of Stock [Line Items]
Sale of common stock sold under sale agreement (in shares)					150,000			145,749
Proceeds from issuance of common stock \| $								$ 1,700,000
Net proceeds from issuance of common stock \| $								$ 1,600,000
ATM Program
Subsidiary, Sale of Stock [Line Items]
Common stock, shares issued (in shares)											498,962		498,962	498,962
Sale of common stock sold under sale agreement (in shares)											434,401			434,401
Common stock, value authorized \| $																			$ 30,000,000.0
Average sales price price (in dollars per share) \| $ / shares											$ 12.57		$ 12.57	$ 12.57
Common stock, value, outstanding \| $											$ 6,300,000		$ 6,300,000	$ 6,300,000
Common stock, value, issued \| $											$ 6,200,000		$ 6,200,000	$ 6,200,000
At Market Program 2017 Issuances
Subsidiary, Sale of Stock [Line Items]
Average sales price price (in dollars per share) \| $ / shares											$ 12.92		$ 12.92	$ 12.92
Common stock, value, outstanding \| $											$ 5,600,000		$ 5,600,000	$ 5,600,000
Common stock, value, issued \| $											$ 5,500,000		$ 5,500,000	$ 5,500,000
Common Stock
Subsidiary, Sale of Stock [Line Items]
Common stock, shares outstanding (in shares)											13,485,025.000		13,485,025.000	13,485,025.000	10,024,875	10,024,875		9,992,941
Common Stock \| 2017 Registration Statement
Subsidiary, Sale of Stock [Line Items]
Securities allowed for issuance (amount up to) \| $							$ 300,000,000
Preferred Stock \| 2017 Registration Statement
Subsidiary, Sale of Stock [Line Items]
Common stock, shares issued (in shares)											1,584,401		1,584,401	1,584,401
Preferred Stock \| 2014 Registration Statement
Subsidiary, Sale of Stock [Line Items]
Common stock, shares issued (in shares)												1,150,000
Limited Partner
Subsidiary, Sale of Stock [Line Items]
OP units redeemed for common stock (in shares)			50,000
Subsequent event \| ATM Program
Subsidiary, Sale of Stock [Line Items]
Sale of common stock sold under sale agreement (in shares)	121,875									31,038
Average sales price of common stock sold (in dollars per share) \| $ / shares										$ 13.39
Proceeds from issuance of common stock \| $										$ 409,000
OP Unit Holder
Subsidiary, Sale of Stock [Line Items]
Minimum ownership period require to redeem units														12 months
Conversion ratio														1
Gladstone Land Limited Partnership
Subsidiary, Sale of Stock [Line Items]
Company's ownership percent (as percent)											91.70%		91.70%	91.70%		87.40%
OP units held by non-controlling limited partners (in shares)														1,227,383		1,449,258
OP units held by non-controlling interest limited partners (in shares)											993,431		993,431	993,431		0
Gladstone Land Limited Partnership \| Limited Partner
Subsidiary, Sale of Stock [Line Items]
OP units redeemed (in shares)				221,875
OP units redeemed for cash (in shares)			171,875
OP units redeemed for cash \| $			$ 2,300,000
Gladstone Land Limited Partnership \| Subsequent event \| Limited Partner
Subsidiary, Sale of Stock [Line Items]
OP units redeemed (in shares)		121,875