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

Real Estate and Intangible Assets - Summary of Acquired Properties (Details) $ in Thousands				3 Months Ended
	Mar. 09, 2019 USD ($) ft²	Feb. 28, 2019 USD ($) ft²	Feb. 08, 2019 USD ($) ft²	Mar. 31, 2019 USD ($) ft²	Mar. 31, 2018 USD ($) ft²
Business Acquisition [Line Items]
Purchase Price				$ 6,315	$ 14,341
Philadelphia, Pennsylvania
Business Acquisition [Line Items]
Square Footage \| ft²			26,050
Lease Term			15 years 23 days
Purchase Price			$ 2,700
Annualized GAAP Rent			$ 200
Indianapolis, Indiana
Business Acquisition [Line Items]
Square Footage \| ft²		34,800
Lease Term		10 years 1 day
Purchase Price		$ 3,600
Annualized GAAP Rent		$ 300
Vance, Alabama
Business Acquisition [Line Items]
Square Footage \| ft²	127,444
Lease Term	9 years 9 months 18 days
Purchase Price	$ 14,300
Annualized GAAP Rent	$ 1,100
Series of Property Acquisitions
Business Acquisition [Line Items]
Square Footage \| ft²				60,850	127,444
Lease Term				12 years 2 months 12 days	9 years 9 months 18 days
Purchase Price				$ 6,315	$ 14,341
Acquisition Expenses				100	100
Annualized GAAP Rent				$ 516	$ 1,087