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)														2 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
Equity - Additional Information (Detail)	Jan. 17, 2018 USD ($) $ / shares shares	Jan. 16, 2018 shares	Dec. 28, 2017 USD ($) $ / shares	Dec. 27, 2017 shares	Dec. 01, 2017 shares	Nov. 28, 2017 shares	Oct. 13, 2017 shares	Oct. 06, 2017 shares	Sep. 29, 2017 USD ($) $ / shares shares	Sep. 20, 2017 shares	Jul. 12, 2017 shares	Apr. 12, 2017 USD ($) security	Aug. 17, 2016 USD ($)	Feb. 20, 2018 USD ($) shares	Mar. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) shares	Jan. 10, 2018 USD ($) shares	Jan. 09, 2018 shares	Jul. 11, 2017 shares	Dec. 31, 2014 shares	Apr. 02, 2014 USD ($)
Subsidiary, Sale of Stock [Line Items]
Common stock, shares authorized (in shares)											100,000,000						98,000,000	18,000,000				20,000,000
Common Stock, Increase In Shares Authorized											80,000,000
Common stock, par value (in dollars per share) \| $ / shares																	$ 0.001	$ 0.001
Common stock, shares issued (in shares)																	13,791,574	10,024,875
Common stock, shares outstanding (in shares)																	13,791,574	10,024,875
Partners' capital account, units, redeemed (in USD per share) \| $ / shares			$ 13.35						$ 13.21
Operating partnership units held by anyone other than company (in shares)																			854,116
Payments of dividends \| $																	$ 6,400,000	$ 5,000,000	$ 4,100,000
Maximum number of securities can be sold under shelf registration statement \| security												2
Proceeds from issuance of equity \| $																	41,907,000	$ 360,000	$ 23,133,000
Professional fees \| $																	$ 713,000
Subsequent Event
Subsidiary, Sale of Stock [Line Items]
Common stock, shares issued (in shares)																				91,500,000	98,000,000
Partners' capital account, units, redeemed (in USD per share) \| $ / shares	$ 13.42
Common Stock
Subsidiary, Sale of Stock [Line Items]
Common stock, shares outstanding (in shares)																	13,791,574.000	10,024,875	9,992,941				7,753,717
Universal Registration Statement One \| Common Stock
Subsidiary, Sale of Stock [Line Items]
Common stock, shares issued (in shares)																	4,013,763
Securities allowed for issuance \| $																								$ 300,000,000
Universal Registration Statement Two
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of equity \| $																$ 21,200,000
Universal Registration Statement Two \| Common Stock
Subsidiary, Sale of Stock [Line Items]
Securities allowed for issuance \| $												$ 300,000,000
Universal Registration Statement Two \| Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Common stock, shares issued (in shares)																	1,694,075
At-the-Market Program
Subsidiary, Sale of Stock [Line Items]
Common stock, shares issued (in shares)																	608,636
Sale of common stock sold under sale agreement (in shares)							121,875										544,075
Gross proceeds from issuance of common stock \| $																	$ 7,100,000
At-the-Market Program \| Subsequent Event
Subsidiary, Sale of Stock [Line Items]
Sale of common stock sold under sale agreement (in shares)														96,590
Gross proceeds from issuance of common stock \| $														$ 1,300,000
Series A cumulative term preferred stock
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of equity \| $													$ 27,600,000
Series A cumulative term preferred stock \| Universal Registration Statement One \| Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Common stock, shares issued (in shares)																	1,150,000
Gross proceeds from issuance of common stock \| $																	$ 73,100,000
Series B Preferred Stock \| Preferred Stock \| Subsequent Event
Subsidiary, Sale of Stock [Line Items]
Securities allowed for issuance \| $														$ 162,500,000						$ 150,000,000
Gladstone Land Limited Partnership
Subsidiary, Sale of Stock [Line Items]
Company's ownership percent of voting securities of Land Advisers																	93.20%	87.40%
Operating partnership units held by anyone other than company (in shares)																	1,008,105	1,449,258
Operating partnership units eligible redemption																	1,008,105	0
Limited Partner
Subsidiary, Sale of Stock [Line Items]
Stock issued during period, shares, conversion of units					75,000				50,000								246,875
Limited Partner \| Subsequent Event
Subsidiary, Sale of Stock [Line Items]
Stock issued during period, shares, conversion of units	7,700
Limited Partner \| Gladstone Land Limited Partnership
Subsidiary, Sale of Stock [Line Items]
Partners' capital account, units, redeemed				22,403		75,000		121,875		221,875
Partners' capital account, units, converted									50,000
Partners' capital account, units, redeemed for cash									171,875
Partners' capital account, redemptions \| $			$ 299,000						$ 2,300,000
Limited Partner \| Gladstone Land Limited Partnership \| Subsequent Event
Subsidiary, Sale of Stock [Line Items]
Partners' capital account, units, redeemed		37,500
Partners' capital account, units, converted	7,700
Partners' capital account, units, redeemed for cash	29,800
Partners' capital account, redemptions \| $	$ 400,000
General and Administrative Expense \| Universal Registration Statement One
Subsidiary, Sale of Stock [Line Items]
Professional fees \| $															$ 46,000