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

Real Estate and Intangible Assets - Fair Value of Acquired Assets and Liabilities Assumed (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Discount on Assumed Debt	$ 0	$ 399
Total Purchase Price	63,245	132,157
Customer Relationships
Business Acquisition [Line Items]
Purchase Price	2,698	10,806
Above Market Leases
Business Acquisition [Line Items]
Purchase Price	239	3,824
Below Market Leases
Business Acquisition [Line Items]
Fair Value of Interest Rate Swap Assumed and (Below Market Leases)	1,475	2,101
Land
Business Acquisition [Line Items]
Purchase Price	6,278	21,509
Building
Business Acquisition [Line Items]
Purchase Price	44,754	68,617
Tenant Improvements
Business Acquisition [Line Items]
Purchase Price	2,400	9,977
In-Place Leases
Business Acquisition [Line Items]
Purchase Price	4,418	12,018
Leasing Costs
Business Acquisition [Line Items]
Purchase Price	3,933	7,066
Interest rate swaps
Business Acquisition [Line Items]
Fair Value of Interest Rate Swap Assumed and (Below Market Leases)	$ 0	$ 42