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

Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail)

Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) - Subsequent Event - $ / shares								1 Months Ended
	Feb. 07, 2019	Apr. 06, 2018	Mar. 30, 2018	Mar. 07, 2018	Feb. 28, 2018	Jan. 31, 2018	Jan. 19, 2018	Mar. 31, 2018	Feb. 28, 2018	Jan. 31, 2018	Feb. 07, 2018
Series A Preferred Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)							$ 0.4843749
Series B Preferred Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)							0.46875
Series D Preferred Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)							0.4374999
Senior Common Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)							0.2625
Common Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)							$ 0.375
Dividend Declared for Month of January
Dividends Payable [Line Items]
Record date							Jan. 22, 2018
Payment date						Jan. 31, 2018
Dividend Declared for Month of January \| Series A Preferred Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)						$ 0.1614583				$ 0.1614583
Dividend Declared for Month of January \| Series B Preferred Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)						0.15625				0.15625
Dividend Declared for Month of January \| Series D Preferred Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)						0.1458333				$ 0.1458333
Dividend Declared for Month of January \| Senior Common Stock
Dividends Payable [Line Items]
Payment date	Feb. 07, 2018
Month in which distribution is payable to holders of record										January
Distributions (in dollars per share)											$ 0.0875
Dividend Declared for Month of January \| Common Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)						$ 0.125				$ 0.125
Dividend Declared for Month of February
Dividends Payable [Line Items]
Record date							Feb. 16, 2018
Payment date					Feb. 28, 2018
Dividend Declared for Month of February \| Series A Preferred Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)					$ 0.1614583				$ 0.1614583
Dividend Declared for Month of February \| Series B Preferred Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)					0.15625				0.15625
Dividend Declared for Month of February \| Series D Preferred Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)					0.1458333				$ 0.1458333
Dividend Declared for Month of February \| Senior Common Stock
Dividends Payable [Line Items]
Payment date				Mar. 07, 2018
Month in which distribution is payable to holders of record									February
Distributions (in dollars per share)				$ 0.0875
Dividend Declared for Month of February \| Common Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)					$ 0.125				$ 0.125
Dividend Declared for Month of March
Dividends Payable [Line Items]
Record date							Mar. 20, 2018
Payment date			Mar. 30, 2018
Dividend Declared for Month of March \| Series A Preferred Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)			$ 0.1614583
Dividend Declared for Month of March \| Series B Preferred Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)			0.15625
Dividend Declared for Month of March \| Series D Preferred Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)			0.1458333
Dividend Declared for Month of March \| Senior Common Stock
Dividends Payable [Line Items]
Payment date		Apr. 06, 2018
Month in which distribution is payable to holders of record								March
Distributions (in dollars per share)		$ 0.0875
Dividend Declared for Month of March \| Common Stock
Dividends Payable [Line Items]
Distributions (in dollars per share)			$ 0.125