XML 36 R24.htm IDEA: XBRL DOCUMENT
v3.19.2

Organization, Basis of Presentation and Significant Accounting Policies (Detail) $ in Thousands | Jun. 30, 2019 USD ($) agreement | Jan. 11, 2019 USD ($) | Jan. 01, 2019 USD ($) agreement
--- | --- | --- | ---
Lessee, Lease, Description [Line Items] |  |  |
Right-of-use assets from operating leases | $ | $ 5,897 |  |
Operating lease liabilities | $ | $ 5,924 |  |
Number of operating ground lease arrangements | 4 |  |
ASU 2016-02 |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Right-of-use assets from operating leases | $ |  |  | $ 6,000
Operating lease liabilities | $ |  | $ 6,000 |
Number of fixed rental charges operating ground lease arrangements |  |  | 3
Number of variable charges operating ground lease arrangements |  |  | 1
Number of options to extend operating ground lease arrangements |  |  | 3
Number of early termination options operating ground lease arrangements |  |  | 1
ASU 2016-02 | Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Discount rate, basis spread on variable rate |  |  | 2.50%
ASU 2016-02 | Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Discount rate, basis spread on variable rate |  |  | 2.60%

X
- Definition Lessee, Operating Lease, Discount Rate, Basis Spread On Variable Rate + References No definition available. + Details
Name: | good_LesseeOperatingLeaseDiscountRateBasisSpreadOnVariableRate
Namespace Prefix: | good_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Lessee, Operating Lease, Early Termination Option, Number of Operating Lease Arrangements + References No definition available. + Details
Name: | good_LesseeOperatingLeaseEarlyTerminationOptionNumberofOperatingLeaseArrangements
Namespace Prefix: | good_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Lessee, Operating Lease, Fixed Rental Charges, Number of Operating Lease Arrangements + References No definition available. + Details
Name: | good_LesseeOperatingLeaseFixedRentalChargesNumberofOperatingLeaseArrangements
Namespace Prefix: | good_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Lessee, Operating Lease, Number of Operating Lease Arrangements + References No definition available. + Details
Name: | good_LesseeOperatingLeaseNumberofOperatingLeaseArrangements
Namespace Prefix: | good_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Lessee, Operating Lease, Option to Extend, Number of Operating Lease Arrangements + References No definition available. + Details
Name: | good_LesseeOperatingLeaseOptiontoExtendNumberofOperatingLeaseArrangements
Namespace Prefix: | good_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Lessee, Operating Lease, Variable Charges, Number of Operating Lease Arrangements + References No definition available. + Details
Name: | good_LesseeOperatingLeaseVariableChargesNumberofOperatingLeaseArrangements
Namespace Prefix: | good_
Data Type: | xbrli:decimalItemType
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_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |