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

Mortgage Notes Payable and Line of Credit - Summary of Long-Term Mortgages (Detail)

Mortgage Notes Payable and Line of Credit - Summary of Long-Term Mortgages (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Debt Issued	$ 62,231	$ 71,795
Wells Fargo N.A [Member] \| Maturity Date One [Member]
Debt Instrument [Line Items]
Date of Issuance	Mar. 27, 2014
Issuing Bank	Wells Fargo N.A.
Debt Issued	6,330
Interest Rate	5.58%
Maturity Date	Feb. 01, 2016
Wells Fargo N.A [Member] \| Maturity Date Three [Member]
Debt Instrument [Line Items]
Date of Issuance	May 08, 2014
Issuing Bank	Wells Fargo N.A.
Debt Issued	3,816
Interest Rate	6.25%
Maturity Date	Jun. 01, 2016
Key Bank N.A [Member] \| Maturity Date Two [Member]
Debt Instrument [Line Items]
Date of Issuance	Apr. 22, 2014
Issuing Bank	Keybank N.A.
Debt Issued	4,935
Interest Rate	4.90%
Maturity Date	May 01, 2024
Prudential Mortgage Capital Company [Member] \| Maturity Date Four [Member]
Debt Instrument [Line Items]
Date of Issuance	Jun. 09, 2014
Issuing Bank	Prudential Mortgage Capital Company
Debt Issued	22,600
Interest Rate	4.23%
Maturity Date	Jul. 01, 2019
Prudential Mortgage Capital Company [Member] \| Maturity Date Six [Member]
Debt Instrument [Line Items]
Date of Issuance	Dec. 23, 2014
Issuing Bank	Prudential Mortgage Capital Company
Debt Issued	18,450
Interest Rate	4.04%
Maturity Date	Jan. 01, 2025
Everbank [Member] \| Maturity Date Five [Member]
Debt Instrument [Line Items]
Date of Issuance	Sep. 03, 2014
Issuing Bank	Everbank
Debt Issued	$ 6,100
Interest Rate	4.40%
Maturity Date	Oct. 01, 2024