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

Mortgage Notes Payable, Line of Credit and Term Loan Facility - Company's Mortgage Notes Payable and Line of Credit Additional Information (Detail)	6 Months Ended
	Jun. 30, 2016 property mortgage
Debt Instrument [Line Items]
Weighted average interest rate on debt outstanding	4.47%
Properties shared \| property	24
Fixed Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Number of mortgage notes payable \| mortgage	42
Maturity date of mortgage notes payable, start date	Dec. 01, 2016
Maturity date of mortgage notes payable, end date	Jul. 01, 2045
Fixed Rate Mortgage Loans [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Stated Interest Rates	3.75%
Fixed Rate Mortgage Loans [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Stated Interest Rates	6.63%
Variable Rate Mortgage Loans [Member] \| Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Spread on LIBOR	2.15%
Variable Rate Mortgage Loans [Member] \| Maximum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Spread on LIBOR	2.75%
Mortgage Notes Payable [Member]
Debt Instrument [Line Items]
Weighted average interest rate on debt outstanding	4.77%