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Real Estate and Intangible Assets - Additional Information (Detail) (USD $)
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0 Months Ended |
3 Months Ended |
0 Months Ended |
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Feb. 27, 2015
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Feb. 20, 2015
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Mar. 31, 2015
sqft
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Mar. 31, 2014
sqft
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Feb. 09, 2015
Option
Property
sqft
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Jan. 29, 2015
sqft
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Jul. 25, 2014
sqft
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| Real Estate Properties [Line Items] |
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| Area of real estate properties |
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186,834good_AreaOfRealEstateProperties
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41,509good_AreaOfRealEstateProperties
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| Previously occupied space |
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81,371us-gaap_AreaOfRealEstateProperty
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| Lease commission paid |
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$ 65,000us-gaap_PaymentsForLeaseCommissions
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$ 54,000us-gaap_PaymentsForLeaseCommissions
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| Proceeds from sale of property |
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2,800,000us-gaap_ProceedsFromSaleOfRealEstate
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| Carrying value of property |
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2,400,000us-gaap_RealEstateGrossAtCarryingValue
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| Early termination penalty |
1,000,000good_LeaseTerminationFees
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| Effective termination date |
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Dec. 31, 2017
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| Lease termination description |
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Termination option, which allows the tenant to terminate their lease effective December 31, 2017, upon paying a termination penalty of approximately $1.0 million on or before March 31, 2017. All other terms and conditions of the lease remain in full force and effect.
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| Indianapolis, Indiana [Member] |
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| Real Estate Properties [Line Items] |
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| Number of lease agreements modified |
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2good_NumberOfLeaseAgreementsModified
/ invest_InvestmentGeographicRegionAxis
= good_IndianapolisMember
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| Raleigh, North Carolina [Member] |
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| Real Estate Properties [Line Items] |
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| Extended lease expiration |
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2020-07
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| Amount paid for tenant Improvements |
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100,000us-gaap_PaymentsForTenantImprovements
/ invest_InvestmentGeographicRegionAxis
= good_RaleighNorthCarolinaMember
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| Number of properties expanded |
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2good_NumberOfPropertiesExpanded
/ invest_InvestmentGeographicRegionAxis
= good_RaleighNorthCarolinaMember
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| Number of properties occupied by tenant |
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2good_NumberOfPropertiesOccupied
/ invest_InvestmentGeographicRegionAxis
= good_RaleighNorthCarolinaMember
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| Renew the lease for additional periods |
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5 years
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| Previously occupied space |
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174,426us-gaap_AreaOfRealEstateProperty
/ invest_InvestmentGeographicRegionAxis
= good_RaleighNorthCarolinaMember
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| Reduced space by tenant |
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94,200good_ReducedLeaseAgreementAreaOccupied
/ invest_InvestmentGeographicRegionAxis
= good_RaleighNorthCarolinaMember
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| Annualized straight line rent escalations |
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900,000us-gaap_StraightLineRentAdjustments
/ invest_InvestmentGeographicRegionAxis
= good_RaleighNorthCarolinaMember
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| Lease commission paid |
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200,000us-gaap_PaymentsForLeaseCommissions
/ invest_InvestmentGeographicRegionAxis
= good_RaleighNorthCarolinaMember
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| Number of options for renewal of lease |
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2good_NumberOfOptionsForRenewalOfLease
/ invest_InvestmentGeographicRegionAxis
= good_RaleighNorthCarolinaMember
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| Number of years under additional periods for lease renewal option |
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5 years
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| Raleigh, North Carolina [Member] | Previously Reported [Member] |
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| Real Estate Properties [Line Items] |
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| Annualized straight line rent escalations |
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1,300,000us-gaap_StraightLineRentAdjustments
/ invest_InvestmentGeographicRegionAxis
= good_RaleighNorthCarolinaMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
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| Raleigh, North Carolina [Member] | Lease One [Member] |
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| Real Estate Properties [Line Items] |
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| Original lease expiration |
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2015-07
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| Raleigh, North Carolina [Member] | Lease Two [Member] |
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| Real Estate Properties [Line Items] |
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| Original lease expiration |
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2015-07
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| Tenant One [Member] | Indianapolis, Indiana [Member] |
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| Real Estate Properties [Line Items] |
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| Area of real estate properties |
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3,546good_AreaOfRealEstateProperties
/ invest_InvestmentGeographicRegionAxis
= good_IndianapolisMember
/ us-gaap_MajorPropertyClassAxis
= good_TenantOneMember
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| Option to extend lease term |
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7 years
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| Extended lease expiration |
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2023-03
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| Original lease expiration |
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2016-02
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| Amount of annualized straight line rents over the life of the lease |
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60,000us-gaap_OperatingLeasesIncomeStatementMinimumLeaseRevenue
/ invest_InvestmentGeographicRegionAxis
= good_IndianapolisMember
/ us-gaap_MajorPropertyClassAxis
= good_TenantOneMember
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| Amount paid for tenant Improvements |
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60,000us-gaap_PaymentsForTenantImprovements
/ invest_InvestmentGeographicRegionAxis
= good_IndianapolisMember
/ us-gaap_MajorPropertyClassAxis
= good_TenantOneMember
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| Tenant Two [Member] | Indianapolis, Indiana [Member] |
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| Real Estate Properties [Line Items] |
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| Area of real estate properties |
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7,639good_AreaOfRealEstateProperties
/ invest_InvestmentGeographicRegionAxis
= good_IndianapolisMember
/ us-gaap_MajorPropertyClassAxis
= good_TenantTwoMember
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| Original lease expiration |
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2018-01
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| Amount of annualized straight line rents over the life of the lease |
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$ 100,000us-gaap_OperatingLeasesIncomeStatementMinimumLeaseRevenue
/ invest_InvestmentGeographicRegionAxis
= good_IndianapolisMember
/ us-gaap_MajorPropertyClassAxis
= good_TenantTwoMember
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| Extended area of real estate property leased |
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8,275good_ExtendedAreaOfRealEstatePropertyLeased
/ invest_InvestmentGeographicRegionAxis
= good_IndianapolisMember
/ us-gaap_MajorPropertyClassAxis
= good_TenantTwoMember
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