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

Stockholders' Equity - Dividends Declared (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Common Stock [Member]
Dividends Payable [Line Items]
Common Stock, distributions declared per share	$ 1.50	$ 1.50	$ 1.50
Senior Common Stock [Member]
Dividends Payable [Line Items]
Common Stock, distributions declared per share	$ 1.05	$ 1.05	$ 1.05
Series A Preferred Stock [Member]
Dividends Payable [Line Items]
Preferred Stock, distributions declared per share	$ 1.9374996	$ 1.9374996	$ 1.9374996
Series B Preferred Stock [Member]
Dividends Payable [Line Items]
Preferred Stock, distributions declared per share	$ 1.8750	$ 1.8750	$ 1.8750
Series C Preferred Stock [Member]
Dividends Payable [Line Items]
Preferred Stock, distributions declared per share	$ 1.7813	$ 1.7813	$ 1.6328