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

Mortgage Notes Payable, Line of Credit and Term Loan Facility - Summary of Interest Rate Cap Agreement (Detail)

Mortgage Notes Payable, Line of Credit and Term Loan Facility - Summary of Interest Rate Cap Agreement (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Cost	$ 184,000
Notional Amount	51,332,000	$ 33,044,000
Fair Value	$ 25,000	40,000
Interest Rate Cap Agreement November 2013 [Member]
Debt Instrument [Line Items]
Date of Issuance	Nov. 30, 2013
Maturity Date	Dec. 01, 2016
Cost	$ 31,000
Notional Amount	$ 8,200,000	8,200,000
Interest Rate Cap Agreement November 2013 [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
LIBOR Cap	3.00%
Interest Rate Cap Agreement July 2015 [Member]
Debt Instrument [Line Items]
Date of Issuance	Jul. 31, 2015
Maturity Date	Jul. 01, 2018
Cost	$ 68,000
Notional Amount	21,039,000	21,204,000
Fair Value	$ 3,000	14,000
Interest Rate Cap Agreement July 2015 [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
LIBOR Cap	3.00%
Interest Rate Cap Agreement December 2015 [Member]
Debt Instrument [Line Items]
Date of Issuance	Dec. 31, 2015
Maturity Date	Dec. 01, 2020
Cost	$ 52,000
Notional Amount	3,618,000	3,640,000
Fair Value	$ 12,000	$ 26,000
Interest Rate Cap Agreement December 2015 [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
LIBOR Cap	3.00%
Interest Rate Cap Agreement March 2016 [Member]
Debt Instrument [Line Items]
Date of Issuance	Mar. 31, 2016
Maturity Date	Mar. 01, 2019
Cost	$ 33,000
Notional Amount	18,475,000
Fair Value	$ 10,000
Interest Rate Cap Agreement March 2016 [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
LIBOR Cap	3.00%