Annual report pursuant to Section 13 and 15(d)

Business and Organization - Additional Information (Detail)

v2.4.1.9
Business and Organization - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
MARYLAND  
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]  
Company re-incorporated date Mar. 24, 2011
Delaware [Member]  
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]  
Company re-incorporated date May 25, 2004
California [Member]  
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]  
Company originally incorporated date Jun. 14, 1997
Gladstone Land Advisers, Inc. [Member]  
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]  
Fees related to leasing of real estate or ancillary services 0land_FeesRelatedToLeasingOfRealEstateOrAncillaryServices
/ dei_LegalEntityAxis
= land_GladstoneLandAdvisersIncMember
Company's ownership percent of voting securities of Land Advisers 100.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ dei_LegalEntityAxis
= land_GladstoneLandAdvisersIncMember