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

Real Estate and Intangible Assets - Carrying Value of Intangible Assets and Accumulated Amortization (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Below market leases and deferred revenue, gross	$ (21,606)	$ (21,606)
Below market leases and deferred revenue, accumulated amortization	9,290	8,959
Lease Intangibles
Finite-Lived Intangible Assets [Line Items]
Intangibles	169,754	169,734
Intangibles, accumulated amortization	(67,679)	(64,181)
In-place leases
Finite-Lived Intangible Assets [Line Items]
Intangibles	71,391	71,482
Intangibles, accumulated amortization	(29,782)	(28,182)
Leasing costs
Finite-Lived Intangible Assets [Line Items]
Intangibles	48,162	48,000
Intangibles, accumulated amortization	(19,669)	(18,599)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangibles	50,201	50,252
Intangibles, accumulated amortization	(18,228)	(17,400)
Above market leases and below market leases and deferred revenue
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets (liabilities), gross	(11,127)	(11,127)
Finite-lived intangible assets (liabilities), accumulated amortization	1,870	1,663
Above market leases
Finite-Lived Intangible Assets [Line Items]
Intangibles	10,479	10,479
Intangibles, accumulated amortization	$ (7,420)	$ (7,296)