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

Real Estate and Intangible Assets - Summary of Properties Acquired (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended		0 Months Ended	1 Months Ended		0 Months Ended
	Dec. 31, 2014 sqft	Dec. 31, 2013	Oct. 22, 2014	Jul. 31, 2004	Oct. 31, 2005	Dec. 23, 2014 Buildings Lease	Jul. 25, 2014 sqft	Nov. 30, 2014	Apr. 30, 2013
Business Acquisition [Line Items]
Lease expiration year	2016-11
Lease renewal terms description	The other tenants in the building have varying lease expirations from December 2015 to October 2018. No other tenants have renewal options.
Area of property occupied by largest tenant	61,306us-gaap_AreaOfRealEstateProperty						81,371us-gaap_AreaOfRealEstateProperty
Total Purchase Price	$ 140,011good_PurchasePrice	$ 134,438good_PurchasePrice
Total investment in property	722,565	642,353
Canton, North Carolina [Member]
Business Acquisition [Line Items]
Lease expiration year			2024-07
Total Purchase Price	5,550			5,200
Total investment in property								10,800
Clintonville, WI [Member]
Business Acquisition [Line Items]
Total Purchase Price		3,250			5,300
Total investment in property									8,600
Monroe, MI [Member]
Business Acquisition [Line Items]
Total Purchase Price	$ 30,750
Number of buildings acquired						2
Number of leases acquired						2