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

Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Additional Information (Detail)

Real Estate and Intangible Assets - Additional Information (Detail) $ in Thousands				3 Months Ended		9 Months Ended
	Sep. 18, 2015 USD ($) Option	Aug. 28, 2015 USD ($) ft²	Jul. 13, 2015 USD ($) ft² Option	Sep. 30, 2015 USD ($) ft² Property	Sep. 30, 2014 USD ($) ft² Property	Sep. 30, 2015 USD ($) ft² Property	Sep. 30, 2014 USD ($) ft² Property	Dec. 31, 2014 USD ($)
Real Estate Properties [Line Items]
Number of properties acquired \| Property				5	8	5	8
Acquisition of our property, area \| ft²				429,427	1,406,054	429,427	1,406,054
Lease expiration date						Dec. 31, 2015
Tenant improvements				$ 47,399		$ 47,399		$ 41,016
Total amortization expense related to lease intangible assets				3,300	$ 2,600	9,700	$ 7,300
Amortization related to below-market lease				200	200	700	500
Building and Tenant Improvements [Member]
Real Estate Properties [Line Items]
Real estate depreciation expense				5,700	4,900	16,400	13,800
Above Market Leases [Member]
Real Estate Properties [Line Items]
Amortization related to above-market lease				$ 100	$ 100	$ 300	$ 200
Raleigh, North Carolina [Member]
Real Estate Properties [Line Items]
Acquisition of our property, area \| ft²			86,886
Percentage of space occupied			75.00%
Percentage of lease space retained by current tenant			18.00%
Percentage of building lease space occupied			93.00%
Lease commencement date						Aug. 01, 2015
Lease expiration date						Dec. 31, 2027
Annualized straight line rent escalations			$ 500
Number of options for renewal of lease \| Option			2
Renew the lease for additional periods			5 years
Amount provided for tenant improvements			$ 800
Lease commission provided			$ 400
Baytown, Texas [Member]
Real Estate Properties [Line Items]
Annualized straight line rent escalations	$ 130
Number of options for renewal of lease \| Option	2
Renew the lease for additional periods	5 years
Amount provided for tenant improvements	$ 200
Lease commission provided	$ 60
Percentage of building occupied by tenant	57.00%
Lease Term	7 years
Indianapolis, IN [Member]
Real Estate Properties [Line Items]
Acquisition of our property, area \| ft²		4,512			86,495		86,495
Annualized straight line rent escalations		$ 100
Extended area of real estate property leased \| ft²		6,903
Option to extend lease term		3 years
Extended lease period						2021-09
Period for lease expiration						2018-10
Increase in annualized straight line rent escalations		$ 30
Tenant improvements		$ 60
Lease Term							11 years 6 months