Gladstone Commercial Corporation Annual report pursuant to Section 13 and 15(d)

Mortgage Notes Payable, Revolving Credit Facility, and Term Loan Facility Narrative (Detail)

Mortgage Notes Payable, Revolving Credit Facility, and Term Loan Facility Narrative (Detail)	12 Months Ended
	Dec. 31, 2016 property mortgage
Debt Instrument [Line Items]
Libor rate (as percent)	0.77%
Weighted average interest rate on debt outstanding (as percent)	4.48%
Encumbered properties	94
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Encumbered properties	24
Fixed Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Encumbered properties	52
Mortgage Notes Payable [Member]
Debt Instrument [Line Items]
Number of mortgage notes payable \| mortgage	44
Maturity date of mortgage notes payable, start date	Mar. 01, 2017
Maturity date of mortgage notes payable, end date	Jul. 01, 2045
Weighted average interest rate on debt outstanding (as percent)	4.69%
Encumbered properties	70
Variable Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Encumbered properties	18
Variable rate Line of Credit [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Libor rate (as percent)	2.25%
Encumbered properties	24
Minimum [Member] \| Fixed Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt instrument stated percentage (as percent)	3.75%
Minimum [Member] \| Variable Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Libor rate (as percent)	2.15%
Maximum [Member] \| Fixed Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt instrument stated percentage (as percent)	6.63%
Maximum [Member] \| Variable Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Libor rate (as percent)	2.75%