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

Stockholders' Equity - Dividends Declared (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Common Stock [Member]
Dividends Payable [Line Items]
Common Stock, distributions declared per share	$ 0.375	$ 0.375
Senior Common Stock [Member]
Dividends Payable [Line Items]
Common Stock, distributions declared per share	$ 0.2625	$ 0.2625
Series A Preferred Stock [Member]
Dividends Payable [Line Items]
Preferred Stock, distributions declared per share	$ 0.4843749	$ 0.4843749
Series B Preferred Stock [Member]
Dividends Payable [Line Items]
Preferred Stock, distributions declared per share	$ 0.4688	$ 0.4688
Series C Preferred Stock [Member]
Dividends Payable [Line Items]
Preferred Stock, distributions declared per share	$ 0.4453	$ 0.4453