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

Quarterly report pursuant to Section 13 or 15(d)

Mortgage Notes Payable and Credit Facility - Company's Mortgage Notes Payable and Line of Credit (Detail)

Mortgage Notes Payable and Credit Facility - Company's Mortgage Notes Payable and Line of Credit (Detail)		6 Months Ended
	Oct. 27, 2017	Jun. 30, 2018 USD ($) property	Apr. 18, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Encumbered properties \| property		98
Total		$ 542,461,000		$ 542,627,000
LIBOR
Debt Instrument [Line Items]
Spread on LIBOR (as percent)	2.75%
Revolving credit facility
Debt Instrument [Line Items]
Encumbered properties \| property		32
Total		$ 32,808,000		20,715,000
Fixed rate mortgage loans
Debt Instrument [Line Items]
Encumbered properties \| property		48
Carrying value		$ 378,287,000		383,189,000
Variable rate mortgage loans
Debt Instrument [Line Items]
Encumbered properties \| property		18
Carrying value		$ 61,590,000	$ 13,000,000.0	69,302,000
Variable rate mortgage loans \| LIBOR
Debt Instrument [Line Items]
Spread on LIBOR (as percent)		2.25%
Mortgage notes payable
Debt Instrument [Line Items]
Encumbered properties \| property		66
Carrying value		$ 439,877,000
Premiums and discounts (net)		(334,000)		(281,000)
Deferred financing costs, net		(4,470,000)		(4,830,000)
Total		$ 435,073,000		447,380,000
Variable rate revolving credit facility \| Revolving credit facility
Debt Instrument [Line Items]
Encumbered properties \| property		32
Carrying value		$ 33,400,000		21,400,000
Deferred financing costs, net		$ (592,000)		(685,000)
Scheduled maturity dates		Oct. 27, 2021
Variable rate revolving credit facility \| Revolving credit facility \| LIBOR
Debt Instrument [Line Items]
Spread on LIBOR (as percent)		1.75%
Variable rate term loan facility
Debt Instrument [Line Items]
Carrying value		$ 75,000,000		75,000,000
Scheduled maturity dates		Oct. 27, 2022
Variable rate term loan facility \| LIBOR
Debt Instrument [Line Items]
Spread on LIBOR (as percent)		1.70%
Total term loan, net
Debt Instrument [Line Items]
Deferred financing costs, net		$ (420,000)		(468,000)
Total		$ 74,580,000		$ 74,532,000