Gladstone Commercial Corporation Annual report pursuant to Section 13 and 15(d)

Real Estate Dispositions, Held for Sale, and Impairment Charges - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) property	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Schedule Of Real Estate Owned Held For Sale [Line Items]
Number of properties sold	6
Number of impaired assets, held and used	0
Impairment charge \| $	$ 2,016	$ 622	$ 14,238
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Schedule Of Real Estate Owned Held For Sale [Line Items]
Number of real estates properties classified as held for sale during period	10
Disposed of by Sale [Member]
Schedule Of Real Estate Owned Held For Sale [Line Items]
Number of real estates properties classified as held for sale during period	2
Number of properties sold	6
Number of real estate properties, held for sale	2
Number of impaired assets sold, held and used	1
Held-for-sale [Member]
Schedule Of Real Estate Owned Held For Sale [Line Items]
Number of impaired assets classified as held for sale during period	7
Number of impaired assets sold	5
Number of impaired assets sold, held for sale	1
Angola, Indiana [Member]
Schedule Of Real Estate Owned Held For Sale [Line Items]
Number of properties sold	2