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

Real Estate and Intangible Assets - Leasing Activity (Details)

v3.8.0.1

Real Estate and Intangible Assets - Leasing Activity (Details) $ in Thousands		12 Months Ended
	May 31, 2016 property	Dec. 31, 2017 USD ($) ft² property	Dec. 31, 2016 USD ($) ft² property	Dec. 31, 2015 USD ($)	Jul. 25, 2014 ft²
Real Estate Properties [Line Items]
Aggregate Square Footage \| ft²		880,749	551,335
Annualized GAAP Rent		$ 6,976	$ 2,478
Tenant Improvement		1,264	1,244
Leasing Commissions		$ 742	$ 436
Number of leased properties \| property		9	9
Tenant reimbursements		$ 1,988	$ 1,489	$ 1,753
Property area \| ft²					81,371
Rental revenue		$ 92,811	$ 84,498	80,892
Weighted Average
Real Estate Properties [Line Items]
Lease Term		9 years 2 months 12 days	3 years 10 months 24 days
Minimum
Real Estate Properties [Line Items]
Lease Term		1 year	1 year
Maximum
Real Estate Properties [Line Items]
Lease Term		11 years 3 months	7 years 8 months 12 days
Newburyport, Massachusetts [Member]
Real Estate Properties [Line Items]
Number of leased properties \| property	1
Tenant reimbursements			$ 900
Other Income [Member] \| Newburyport, Massachusetts [Member]
Real Estate Properties [Line Items]
Tenant reimbursements			300
Vance, Alabama Industrial Building
Real Estate Properties [Line Items]
Property area \| ft²		75,000
Buildings and improvements, gross		$ 6,700
Rental revenue		$ 1,800	$ 1,200	$ 1,200
Vance, Alabama Industrial Building \| Maximum
Real Estate Properties [Line Items]
Lease Term		10 years

- Definition

Annualized straight line rent on leased property.

+ References

No definition available.

+ Details

Name:	good_AnnualizedStraightLineRentOnLeasedProperty
Namespace Prefix:	good_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Area of leased property.

+ References

No definition available.

+ Details

Name:	good_AreaOfLeasedProperty
Namespace Prefix:	good_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

Lease term available for lease.

+ References

No definition available.

+ Details

Name:	good_LeaseTermAvailableForLease
Namespace Prefix:	good_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of leased properties.

+ References

No definition available.

+ Details

Name:	good_NumberOfLeasedProperties
Namespace Prefix:	good_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 4
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

+ Details

Name:	us-gaap_BuildingsAndImprovementsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707

+ Details

Name:	us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash outflow for lease commissions incurred.

+ References

No definition available.

+ Details

Name:	us-gaap_PaymentsForLeaseCommissions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash outflow for the allowance granted to lessee and/or direct costs incurred by lessor used to prepare the leased premises for tenant's occupancy.

+ References

No definition available.

+ Details

Name:	us-gaap_PaymentsForTenantImprovements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

In accordance with the provisions of their lease agreement, this element represents allowable charges due a landlord from its tenant. In retail store and office building leases, for example, tenant reimbursements may cover items such as taxes, utilities, and common area expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_TenantReimbursements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_RangeAxis=us-gaap_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationCaseAxis=good_NewburyportMassachusettsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OtherIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=good_VanceAlabamaIndustrialBuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: