XML 39 R27.htm IDEA: XBRL DOCUMENT
v3.21.2

Real Estate and Intangible Assets - Summary of Acquired Properties (Details) $ in Thousands |  |  |  |  |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 20, 2021 USD ($) ft² property tenant | Jul. 21, 2021 USD ($) ft² property tenant | Jun. 17, 2021 USD ($) ft² tenant | Jan. 22, 2021 USD ($) ft² tenant | Sep. 01, 2020 USD ($) ft² tenant | Mar. 09, 2020 USD ($) ft² tenant | Jan. 27, 2020 USD ($) ft² property | Jan. 08, 2020 USD ($) ft² tenant | Sep. 30, 2021 USD ($) ft² property | Sep. 30, 2020 USD ($) ft² property
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  |  |  | 8 | 6
Aggregate Purchase Price |  |  |  |  |  |  |  |  | $ 46,225 | $ 82,599
Findlay, Ohio |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  |  | 180,152 |  |  |  |  |  |
Weighted Average Remaining Lease Term at Time of Acquisition |  |  |  | 14 years 2 months 12 days |  |  |  |  |  |
Aggregate Purchase Price |  |  |  | $ 11,100 |  |  |  |  |  |
Number of tenants | tenant |  |  |  | 1 |  |  |  |  |  |
Baytown, Texas |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  | 25,200 |  |  |  |  |  |  |
Weighted Average Remaining Lease Term at Time of Acquisition |  |  | 12 years 7 months 6 days |  |  |  |  |  |  |
Aggregate Purchase Price |  |  | $ 8,200 |  |  |  |  |  |  |
Number of tenants | tenant |  |  | 1 |  |  |  |  |  |  |
Pacific, Missouri |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  | 80,604 |  |  |  |  |  |  |  |
Weighted Average Remaining Lease Term at Time of Acquisition |  | 17 years 4 months 24 days |  |  |  |  |  |  |  |
Aggregate Purchase Price |  | $ 22,100 |  |  |  |  |  |  |  |
Number of tenants | tenant |  | 1 |  |  |  |  |  |  |  |
Number of properties in portfolio | property |  | 4 |  |  |  |  |  |  |  |
Peru, Illinois |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² | 81,760 |  |  |  |  |  |  |  |  |
Weighted Average Remaining Lease Term at Time of Acquisition | 15 years |  |  |  |  |  |  |  |  |
Aggregate Purchase Price | $ 4,800 |  |  |  |  |  |  |  |  |
Number of tenants | tenant | 1 |  |  |  |  |  |  |  |  |
Number of properties in portfolio | property | 2 |  |  |  |  |  |  |  |  |
Indianapolis, Indiana |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  |  |  | 153,600 |  |  | 64,800 |  |
Weighted Average Remaining Lease Term at Time of Acquisition |  |  |  |  | 9 years 8 months 12 days |  |  | 7 years 2 months 12 days |  |
Aggregate Purchase Price |  |  |  |  | $ 10,600 |  |  | $ 5,300 |  |
Number of tenants | tenant |  |  |  |  | 1 |  |  | 3 |  |
Houston, Texas; Charlotte, North Carolina; St. Charles, Missouri |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  |  |  |  |  | 320,838 |  |  |
Weighted Average Remaining Lease Term at Time of Acquisition |  |  |  |  |  |  | 20 years |  |  |
Aggregate Purchase Price |  |  |  |  |  |  | $ 34,700 |  |  |
Number of properties in portfolio | property |  |  |  |  |  |  | 3 |  |  |
Crandall, Georgia |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  |  |  |  | 504,400 |  |  |  |
Weighted Average Remaining Lease Term at Time of Acquisition |  |  |  |  |  | 10 years 6 months |  |  |  |
Aggregate Purchase Price |  |  |  |  |  | $ 32,000 |  |  |  |
Number of tenants | tenant |  |  |  |  |  | 1 |  |  |  |
Series of property acquisitions |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  |  |  |  |  |  |  | 367,716 | 1,043,638
Weighted Average Remaining Lease Term at Time of Acquisition |  |  |  |  |  |  |  |  | 15 years 6 months | 14 years 2 months 12 days
Aggregate Purchase Price |  |  |  |  |  |  |  |  | $ 46,225 | $ 82,599
Aggregate Capitalized Acquisition Costs |  |  |  |  |  |  |  |  | $ 370 | $ 339

X
- Definition Business acquisition expenses. + References No definition available. + Details
Name: | good_BusinessAcquisitionExpenses
Namespace Prefix: | good_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

X
- Definition Lessor, Operating Lease, Number of Tenants + References No definition available. + Details
Name: | good_LessorOperatingLeaseNumberofTenants
Namespace Prefix: | good_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of properties acquired. + References No definition available. + Details
Name: | good_NumberOfPropertiesAcquired
Namespace Prefix: | good_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Properties In Portfolio + References No definition available. + Details
Name: | good_NumberOfPropertiesInPortfolio
Namespace Prefix: | good_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Purchase price of acquired property. + References No definition available. + Details
Name: | good_PurchasePriceOfAcquiredProperty
Namespace Prefix: | good_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- 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_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=good_FindlayOhioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=good_BaytownTexasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=good_PacificMissouriMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=good_PeruIllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=good_IndianapolisIndianaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=good_HoustonTexasCharlotteNorthCarolinaSt.CharlesMissouriMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=good_CrandallGeorgiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=good_SeriesofPropertyAcquisitionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |