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 Line of Credit - Additional Information (Detail)

Mortgage Notes Payable and Line of Credit - Additional Information (Detail)			3 Months Ended		6 Months Ended
	Jul. 01, 2015 USD ($)	Jun. 29, 2015 USD ($)	Jun. 30, 2015 USD ($) Property Mortgages	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Property Mortgages	Jun. 30, 2014 USD ($)	Aug. 03, 2015 USD ($)	Dec. 31, 2014 USD ($)	Nov. 30, 2014 USD ($)	Aug. 31, 2013 USD ($)
Debt Instrument [Line Items]
Number of mortgage notes payable \| Mortgages			44		44
Weighted average interest rate on debt outstanding			4.93%		4.93%
Number of properties collateralized in mortgage notes payable \| Property			99		99
Net book value of collateralized mortgage properties			$ 692,000,000		$ 692,000,000
Number of long-term mortgages issued \| Mortgages					4
Number of properties to issue collateralized mortgage notes payable \| Property					5
Payments of deferred financing costs			400,000	$ 400,000	$ 883,000	$ 633,000
Libor rate					0.19%
Debt instrument maturity date description					This loan matures upon the earlier of April 2016 or the sale of the transitional care facility, which is anticipated to occur in October 2015.
Extension period subject to payment of fee					1 year
Fair value of mortgage notes payable outstanding			498,600,000		$ 498,600,000
Borrowings under line of credit			$ 45,200,000		$ 45,200,000			$ 43,300,000		$ 60,000,000
Line of credit facility, maximum additional amount drawn									$ 75,000,000
Line of credit, maturity date					2017-08
Extension fee on the initial maturity date					0.25%
Line of credit at an interest rate			2.94%		2.94%
Letters of credit, outstanding			$ 3,900,000		$ 3,900,000
Interest Rate Cap [Member]
Debt Instrument [Line Items]
LIBOR Cap			3.00%		3.00%
Synovus Bank [Member]
Debt Instrument [Line Items]
Libor rate					2.25%
Maturity Date					Jul. 01, 2018
Subsequent Event [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum additional amount drawn							$ 9,200,000
LIBOR [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
LIBOR Cap	3.00%
Letter of Credit [Member]
Debt Instrument [Line Items]
Weighted average interest rate on debt outstanding			2.75%		2.75%
Mortgage Notes Payable [Member]
Debt Instrument [Line Items]
Weighted average interest rate on debt outstanding			5.11%		5.11%
Number of properties collateralized in mortgage notes payable \| Property			80		80
Debt instrument stated percentage		5.30%
Debt instrument balloon payment to be paid		$ 19,100,000
Debt instrument original maturity date					Sep. 01, 2015
One month LIBOR rate			0.19%		0.19%
Excess of LIBOR rate					3.00%
Carrying value of mortgage notes payable outstanding			$ 486,800,000		$ 486,800,000
Mortgage Notes Payable [Member] \| Synovus Bank [Member]
Debt Instrument [Line Items]
Long-term notes payable		$ 19,800,000
Debt instrument, frequency of periodic payment					Monthly
Libor rate		2.25%
Debt instrument maturity date description					Maturity date of July 1, 2018, with one, two-year extension option.
Extension period subject to payment of fee					2 years
Maturity Date					Jul. 01, 2018
Mortgage Notes Payable [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Long-term notes payable	$ 1,700,000
Debt instrument original maturity date	Sep. 01, 2015
Mortgage Notes Payable [Member] \| LIBOR [Member] \| Subsequent Event [Member] \| Synovus Bank [Member] \| Interest Rate Cap [Member]
Debt Instrument [Line Items]
LIBOR Cap	3.00%