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

Stockholders' Equity - Additional Information (Detail) - Cantor Fitzgerald & Co [Member] - USD ($)	1 Months Ended	3 Months Ended
	Feb. 29, 2016	Mar. 31, 2016
Series A Cumulative Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Redeemable preferred stock, dividend rate percentage	7.75%
Series B Cumulative Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Redeemable preferred stock, dividend rate percentage	7.50%
Preferred Stock [Member]
Class of Stock [Line Items]
Maximum aggregate sales price of shares to be issued under open market sale agreement	$ 40,000,000
Maximum remaining capacity to sell preferred stock under open market sale agreement		$ 38,200,000
Preferred Stock [Member] \| Series B Cumulative Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Number of shares sold under open market sale agreement		74,000
Net proceeds under ATM program		$ 1,800,000
Common Stock [Member]
Class of Stock [Line Items]
Maximum aggregate sales price of shares to be issued under open market sale agreement		$ 160,000,000
Number of shares sold under open market sale agreement		65,000
Net proceeds under ATM program		$ 900,000
Maximum remaining capacity to sell common stock under open market sale agreement		$ 160,000,000