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, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Below market leases and deferred revenue, gross	$ (51,581)	$ (48,241)
Below market leases and deferred revenue, accumulated amortization	22,284	21,471
Lease Intangibles
Finite-Lived Intangible Assets [Line Items]
Lease Intangibles	262,201	259,300
Accumulated Amortization	(149,546)	(144,806)
In-place leases
Finite-Lived Intangible Assets [Line Items]
Lease Intangibles	106,738	105,891
Accumulated Amortization	(64,497)	(62,604)
Leasing costs
Finite-Lived Intangible Assets [Line Items]
Lease Intangibles	82,974	81,487
Accumulated Amortization	(45,477)	(43,982)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Lease Intangibles	72,489	71,922
Accumulated Amortization	(39,572)	(38,220)
Above market leases
Finite-Lived Intangible Assets [Line Items]
Lease Intangibles	15,817	15,538
Accumulated Amortization	$ (11,718)	$ (11,520)