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

Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Summary of Acquired Properties (Details)

Real Estate and Intangible Assets - Summary of Acquired Properties (Details) $ in Thousands							6 Months Ended		12 Months Ended
	Jun. 18, 2019 USD ($) ft²	Apr. 30, 2019 USD ($) ft²	Apr. 05, 2019 USD ($) ft²	Feb. 28, 2019 USD ($) ft²	Feb. 08, 2019 USD ($) ft²	Mar. 09, 2018 USD ($) ft²	Jun. 30, 2019 USD ($) ft²	Jun. 30, 2018 USD ($) ft²	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Aggregate Purchase Price							$ 46,557	$ 14,341
Series of Property Acquisitions
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²							1,174,311	127,444
Weighted Average Lease Term							13 years 8 months 12 days	9 years 9 months 18 days
Aggregate Purchase Price							$ 46,557	$ 14,341
Acquisition Expenses							452	91
Aggregate Annualized GAAP Rent							3,819	$ 1,087
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, New Mortgage Loan									$ 8,900	$ 0
Philadelphia, Pennsylvania
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²					26,050
Weighted Average Lease Term					15 years 23 days
Aggregate Purchase Price					$ 2,700
Aggregate Annualized GAAP Rent					$ 200
Indianapolis, Indiana
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²				34,800
Weighted Average Lease Term				10 years 1 day
Aggregate Purchase Price				$ 3,600
Aggregate Annualized GAAP Rent				$ 300
Ocala, Florida
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²			207,000
Weighted Average Lease Term			20 years 26 days
Aggregate Purchase Price			$ 11,900
Aggregate Annualized GAAP Rent			$ 800
Ocala, Florida
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²			176,000
Weighted Average Lease Term			20 years 26 days
Aggregate Purchase Price			$ 7,300
Aggregate Annualized GAAP Rent			$ 700
Columbus, Ohio
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²		54,430
Weighted Average Lease Term		7 years
Aggregate Purchase Price		$ 3,200
Aggregate Annualized GAAP Rent		$ 200
Tifton, Georgia
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²	676,031
Weighted Average Lease Term	8 years 5 months 13 days
Aggregate Purchase Price	$ 17,900
Aggregate Annualized GAAP Rent	$ 1,600
Vance, Alabama
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²						127,444
Weighted Average Lease Term						9 years 9 months 18 days
Aggregate Purchase Price						$ 14,300
Aggregate Annualized GAAP Rent						$ 1,100
New fixed rate mortgage notes payable
Business Acquisition [Line Items]
Aggregate Fixed Rate Debt Issued or Assumed							$ 41,140
Stated interest rate (as percent)							3.95%
New fixed rate mortgage notes payable \| Tifton, Georgia
Business Acquisition [Line Items]
Aggregate Fixed Rate Debt Issued or Assumed							$ 8,900
Stated interest rate (as percent)							4.35%