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

Quarterly report pursuant to Section 13 or 15(d)

Borrowings - Summary of Mortgage Note Payable and Line of Credit Additional Information (Detail)

Borrowings - Summary of Mortgage Note Payable and Line of Credit Additional Information (Detail)			1 Months Ended				3 Months Ended		12 Months Ended
	Oct. 13, 2017	May 31, 2017 USD ($) debt_instrument	Apr. 30, 2018 USD ($)	Feb. 28, 2018 USD ($)	Apr. 30, 2017 USD ($)	Feb. 28, 2017 USD ($)	Mar. 31, 2018 USD ($) debt_instrument property	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Apr. 11, 2018	Mar. 13, 2018 USD ($)	Dec. 15, 2017	Jun. 16, 2016 USD ($)
Debt Instrument [Line Items]
Other income							$ 315,000	$ 184,000
Rabo AgriFinance, LLC [Member]
Debt Instrument [Line Items]
Aggregate Commitment							518,000
Stated interest rate (as percent)	4.59%
Principal Amortization	25 years
New MetLife Facility
Debt Instrument [Line Items]
Principal Outstanding							132,814,000
Long-term debt, additional amount available							$ 16,500,000
Minimum annualized rate (as percent)							2.50%
New MetLife Facility \| Minimum
Debt Instrument [Line Items]
Commitment fee (as percent)							0.10%
New MetLife Facility \| Maximum
Debt Instrument [Line Items]
Commitment fee (as percent)												0.20%
Unused fee, percentage							0.20%
Farm Credit Notes Payable
Debt Instrument [Line Items]
Principal Outstanding							$ 61,114,000
of Loans Outstanding \| debt_instrument							14
Reduction in basis points (as percent)							0.71%
Farm Credit CFL
Debt Instrument [Line Items]
Principal Outstanding							$ 24,496,000
Stated interest rate (as percent)							4.29%
of Loans Outstanding \| debt_instrument							7
Other income					$ 124,000
Reduced stated interest rate (as percent)							18.00%
Farm Credit West
Debt Instrument [Line Items]
Principal Outstanding							$ 24,222,000
Stated interest rate (as percent)							4.02%
of Loans Outstanding \| debt_instrument							4
Other income				$ 126,000		$ 59,000
Reduced stated interest rate (as percent)				19.70%
Reduction in basis points (as percent)				0.75%
CF Farm Credit
Debt Instrument [Line Items]
Principal Outstanding							$ 1,301,000
Stated interest rate (as percent)							4.41%
of Loans Outstanding \| debt_instrument							1
Other income									$ 0
Farm Credit FL
Debt Instrument [Line Items]
Principal Outstanding							$ 5,727,000
Stated interest rate (as percent)							4.70%
of Loans Outstanding \| debt_instrument							1
Other income									0
NW Farm Credit
Debt Instrument [Line Items]
Principal Outstanding							$ 5,368,000
Stated interest rate (as percent)							4.41%
of Loans Outstanding \| debt_instrument							1
Other income				$ 17,000					$ 0
Reduced stated interest rate (as percent)				22.70%
Reduction in basis points (as percent)				1.00%
Farmer Mac Bonds Payable
Debt Instrument [Line Items]
Aggregate Commitment							$ 125,000,000						$ 125,000,000
Principal Outstanding							$ 85,551,000
Interest rate (as percent)							3.15%
Undrawn Commitment							$ 37,858,000
Long-term debt, additional amount available							$ 0
of Loans Outstanding \| debt_instrument							15
Properties pledged as collateral \| property							0
Farmer Mac Bonds Payable, 2017 Issuances
Debt Instrument [Line Items]
Aggregate Commitment											$ 1,300,000
of Loans Outstanding \| debt_instrument							1
Farmer Mac Bonds Payable, 2017 Issuances \| Minimum
Debt Instrument [Line Items]
Stated interest rate (as percent)											4.47%
Notes payable to bank \| New MetLife Facility
Debt Instrument [Line Items]
Aggregate Commitment							$ 200,000,000
Principal Outstanding							$ 128,914,000
Interest rate (as percent)							3.30%
Undrawn Commitment							$ 63,530,000
Amortizing principal payments							7,600,000
Notes payable to bank \| Metlife Term Loans
Debt Instrument [Line Items]
Aggregate Commitment		$ 15,032,000
Principal Amortization		28 years 7 months
of Loans Outstanding \| debt_instrument		2
Notes payable to bank \| Metlife Term Loans \| Minimum
Debt Instrument [Line Items]
Stated interest rate (as percent)		3.55%
Notes payable to bank \| Metlife Term Loans \| Maximum
Debt Instrument [Line Items]
Stated interest rate (as percent)		3.85%
MetLife Lines of Credit \| New MetLife Facility
Debt Instrument [Line Items]
Aggregate Commitment							75,000,000
Principal Outstanding							3,900,000
Undrawn Commitment							$ 71,100,000
Effective interest rate (as percent)							3.95%
MetLife Lines of Credit \| New MetLife Facility \| LIBOR
Debt Instrument [Line Items]
Percentage added to LIBOR (as percent)							2.25%
Subsequent event \| Farm Credit CFL
Debt Instrument [Line Items]
Other income			$ 142,000
Reduced stated interest rate (as percent)			15.10%
Reduction in basis points (as percent)			0.58%
Subsequent event \| Farm Credit West
Debt Instrument [Line Items]
Stated interest rate (as percent)										4.99%
Other income			$ 11,000
Reduced stated interest rate (as percent)			36.60%
Subsequent event \| CF Farm Credit
Debt Instrument [Line Items]
Reduction in basis points (as percent)			1.61%
Subsequent event \| Farm Credit FL
Debt Instrument [Line Items]
Other income			$ 27,000
Reduced stated interest rate (as percent)			24.60%
Reduction in basis points (as percent)			0.75%