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

Real Estate and Intangible Assets - Weighted Average Amortization Period for Intangible Assets Acquired and Liabilities Assumed (Detail)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Period for intangible assets and liabilities	12 years 6 months	12 years 2 months 12 days
In-Place Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Period for intangible assets and liabilities	10 years 10 months 24 days	10 years 8 months 12 days
Leasing Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Period for intangible assets and liabilities	10 years 10 months 24 days	10 years 8 months 12 days
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Period for intangible assets and liabilities	15 years 7 months 6 days	15 years 7 months 6 days
Above Market Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Period for intangible assets and liabilities	18 years 10 months 24 days	8 years 2 months 12 days
Below Market Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Period for intangible assets and liabilities	12 years 4 months 24 days	11 years 10 months 24 days