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 (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2016 Property Mortgages
Debt Instrument [Line Items]
Number of mortgage notes payable	43
Libor rate description	One month LIBOR was approximately 0.43%
Weighted average interest rate on debt outstanding	4.63%
Properties shared \| Property	22
Fixed Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Number of mortgage notes payable	43
Maturity date of mortgage notes payable, start date	May 05, 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	6.80%
Variable Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Libor rate description	Variable rate mortgage notes payable vary from one month LIBOR + 2.15% to one month LIBOR + 2.35%
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	2.35%
Mortgage Notes Payable [Member]
Debt Instrument [Line Items]
Weighted average interest rate on debt outstanding	4.89%