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 - Mortgages Notes Payable (Detail)

Mortgage Notes Payable and Credit Facility - Mortgages Notes Payable (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) property	Sep. 30, 2016 USD ($) property
Debt Instrument [Line Items]
Aggregate debt repaid	$ 57,182	$ 67,119
Weighted average interest rate on debt repaid (as percent)	4.52%
Number of properties acquired \| property	5	2
Fixed rate mortgage loans
Debt Instrument [Line Items]
Aggregate debt repaid	$ 41,077
Weighted average interest rate on debt repaid (as percent)	6.25%
Fixed rate mortgage loans \| Minimum
Debt Instrument [Line Items]
Stated interest rate (as percent)	3.545%
Fixed rate mortgage loans \| Maximum
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.63%
Variable rate mortgage loans
Debt Instrument [Line Items]
Aggregate debt repaid	$ 8,163
Variable rate mortgage loans \| LIBOR
Debt Instrument [Line Items]
Basis spread (as percent)	2.15%
Variable rate mortgage loans \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread (as percent)	2.75%
Variable rate mortgage loans \| LIBOR \| Weighted average
Debt Instrument [Line Items]
Basis spread (as percent)	2.50%
New fixed rate mortgage loans
Debt Instrument [Line Items]
Aggregate Fixed Rate Debt Issued or Assumed	$ 54,887
Weighted average interest rate on debt repaid (as percent)	3.78%
Number of properties acquired with an interest rate swap \| property	1
Stated interest rate (as percent)	3.55%
New fixed rate mortgage loans \| Minimum
Debt Instrument [Line Items]
Stated interest rate (as percent)	3.75%
New fixed rate mortgage loans \| Maximum
Debt Instrument [Line Items]
Stated interest rate (as percent)	3.89%
New variable rate mortgage loans
Debt Instrument [Line Items]
Aggregate Variable Rate Debt Issued or Assumed	$ 7,500
New variable rate mortgage loans \| LIBOR \| Weighted average
Debt Instrument [Line Items]
Basis spread (as percent)	2.75%
Existing mortgage notes payable \| LIBOR
Debt Instrument [Line Items]
Basis spread (as percent)	2.50%