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Organization, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $)
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12 Months Ended | ||
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Dec. 31, 2014
Subsidiary
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Dec. 31, 2013
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Dec. 31, 2012
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| Organization And Significant Accounting Policies [Line Items] | |||
| Number of subsidiaries interest owned in general and limited partnership | 2good_NumberOfSubsidiariesInterestOwnedInGeneralAndLimitedPartnership | ||
| Non-qualifying income related to real estate portfolio | $ 0good_NonQualifyingIncomeRelatedToRealEstatePortfolio | ||
| Amortization related to below-market lease | 700,000us-gaap_AmortizationOfBelowMarketLease | 600,000us-gaap_AmortizationOfBelowMarketLease | 1,100,000us-gaap_AmortizationOfBelowMarketLease |
| Total amortization expense related to intangible assets | 10,000,000us-gaap_AmortizationOfIntangibleAssets | 7,300,000us-gaap_AmortizationOfIntangibleAssets | 4,900,000us-gaap_AmortizationOfIntangibleAssets |
| Maturity period of highly-liquid investments at the time of purchase | three months or less | ||
| Payments of deferred financing costs | 1,029,000us-gaap_PaymentsOfFinancingCosts | 2,051,000us-gaap_PaymentsOfFinancingCosts | 4,598,000us-gaap_PaymentsOfFinancingCosts |
| Total amortization expense related to deferred financing costs is included in interest expense | 1,656,000us-gaap_AmortizationOfFinancingCosts | 1,780,000us-gaap_AmortizationOfFinancingCosts | 1,502,000us-gaap_AmortizationOfFinancingCosts |
| Deferred rent expense | 800,000good_DeferredRentExpense | ||
| Uncertain tax positions percentage | 50.00%good_MinimumPercentageLikelihoodToRecognizeTaxBenefitFromUncertainTaxPosition | ||
| Uncertain tax positions | 0us-gaap_UnrecognizedTaxBenefits | 0us-gaap_UnrecognizedTaxBenefits | 0us-gaap_UnrecognizedTaxBenefits |
| Liabilities accrued | 400,000us-gaap_AssetRetirementObligationLiabilitiesIncurred | 0us-gaap_AssetRetirementObligationLiabilitiesIncurred | 300,000us-gaap_AssetRetirementObligationLiabilitiesIncurred |
| Expenses recorded to general and administrative expense | 100,000us-gaap_AssetRetirementObligationAccretionExpense | 100,000us-gaap_AssetRetirementObligationAccretionExpense | 200,000us-gaap_AssetRetirementObligationAccretionExpense |
| Aggregate undiscounted obligation on properties | 9,400,000good_AggregateUndiscountedObligationOnProperties | ||
| Expected payment to be made in next twelve months | 0us-gaap_OtherCommitmentDueInNextTwelveMonths | ||
| Expected payment to be made in second year | 0us-gaap_OtherCommitmentDueInSecondYear | ||
| Expected payment to be made in third year | 0us-gaap_OtherCommitmentDueInThirdYear | ||
| Expected payment to be made in fourth year | 0us-gaap_OtherCommitmentDueInFourthYear | ||
| Expected payment to be made in fifth year | 0us-gaap_OtherCommitmentDueInFifthYear | ||
| Real Estate [Member] | |||
| Organization And Significant Accounting Policies [Line Items] | |||
| Real estate depreciation expense |
18,800,000us-gaap_Depreciation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember |
15,500,000us-gaap_Depreciation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember |
11,900,000us-gaap_Depreciation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember |
| Minimum [Member] | |||
| Organization And Significant Accounting Policies [Line Items] | |||
| Expected lease up period for estimating carrying costs | 9 months | ||
| Remaining term of in-place leases and unamortized lease | 10 years | ||
| REIT taxable income to its stockholders |
90.00%good_PercentageOfAnnualRealEstateInvestmentTrustTaxableIncomeDistributeToStockholders / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Percentage of discount rate for calculating undiscounted obligation |
2.50%good_PercentageOfDiscountRateForCalculatingUndiscountedObligation / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Maximum [Member] | |||
| Organization And Significant Accounting Policies [Line Items] | |||
| Expected lease up period for estimating carrying costs | 18 months | ||
| Remaining term of in-place leases and unamortized lease | 15 years | ||
| REIT taxable income to its stockholders |
100.00%good_PercentageOfAnnualRealEstateInvestmentTrustTaxableIncomeDistributeToStockholders / us-gaap_RangeAxis = us-gaap_MaximumMember |
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| Percentage of discount rate for calculating undiscounted obligation |
7.60%good_PercentageOfDiscountRateForCalculatingUndiscountedObligation / us-gaap_RangeAxis = us-gaap_MaximumMember |
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| Above Market Leases [Member] | |||
| Organization And Significant Accounting Policies [Line Items] | |||
| Amortization related to above-market lease |
$ 300,000us-gaap_AmortizationOfLeasedAsset / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember |
$ 300,000us-gaap_AmortizationOfLeasedAsset / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember |
$ 300,000us-gaap_AmortizationOfLeasedAsset / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember |
| Buildings and Improvements [Member] | |||
| Organization And Significant Accounting Policies [Line Items] | |||
| Estimated useful life | 39 years | ||
| Equipment and Fixtures [Member] | Minimum [Member] | |||
| Organization And Significant Accounting Policies [Line Items] | |||
| Estimated useful life | 5 years | ||
| Equipment and Fixtures [Member] | Maximum [Member] | |||
| Organization And Significant Accounting Policies [Line Items] | |||
| Estimated useful life | 20 years | ||
| Gladstone Commercial Advisers, Inc. [Member] | |||
| Organization And Significant Accounting Policies [Line Items] | |||
| Company ownership percentage of voting securities of Commercial Advisers |
100.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = good_SubsidiariesTwoMember |
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| GCLP Business Trust I [Member] | |||
| Organization And Significant Accounting Policies [Line Items] | |||
| Percentage of limited partnership interest transferred to business unit |
99.00%good_PercentageOfLimitedPartnershipInterestTransferredToBusinessUnit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
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| Number of trust shares exchanged for limited partnership interest |
100good_NumberOfTrustSharesExchangedForLimitedPartnershipInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
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| Subsidiary and business trust of the Company, formed under the laws of the Commonwealth of Massachusetts, date | Dec. 28, 2005 | ||
| GCLP Business Trust II [Member] | |||
| Organization And Significant Accounting Policies [Line Items] | |||
| Percentage of limited partnership interest transferred to business unit |
1.00%good_PercentageOfLimitedPartnershipInterestTransferredToBusinessUnit / dei_LegalEntityAxis = good_SubsidiariesOneMember |
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| Number of trust shares exchanged for general partnership interest |
100good_NumberOfTrustSharesExchangedForGeneralPartnershipInterest / dei_LegalEntityAxis = good_SubsidiariesOneMember |
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| Subsidiary and business trust of the Company, formed under the laws of the Commonwealth of Massachusetts, date | Dec. 28, 2005 | ||
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- Definition
Date when an entity was incorporated No definition available.
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- Definition
Aggregate undiscounted obligation on properties. No definition available.
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Cash equivalents maximum maturity period of highly liquid investments. No definition available.
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Deferred Rent Expense No definition available.
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Expected lease up period. No definition available.
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Minimum percentage likelihood to recognize tax benefit from uncertain tax position. No definition available.
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Non qualifying income related to real estate portfolio. No definition available.
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Number of subsidiaries interest owned in general and limited partnership. No definition available.
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Number of trust shares exchanged for general partnership interest. No definition available.
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Number of trust shares exchanged for limited partnership interest. No definition available.
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- Definition
Percentage of annual real estate investment trust taxable income distribute to stockholders. No definition available.
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Percentage of discount rate for calculating undiscounted obligation. No definition available.
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Percentage of limited partnership interest transferred to business unit. No definition available.
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Remaining term of in place leases and unamortized lease. No definition available.
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Amount of amortization of acquired leases acquired as part of a real property acquisition at below market lease rate with a finite life. No definition available.
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- Definition
Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The expense charged against earnings for the periodic recognition of capitalized leases. This element may apply to energy companies that lease mineral producing properties and to other enterprises that capitalize property, plant, or equipment obtained through capital leases. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of asset retirement obligations incurred during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Minimum amount of other commitment maturing in the fifth fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. No definition available.
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- Definition
Minimum amount of other commitment maturing in the fourth fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. No definition available.
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- Definition
Minimum amount of other commitment maturing in the next fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. No definition available.
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- Definition
Minimum amount of other commitment maturing in the second fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. No definition available.
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- Definition
Minimum amount of other commitment maturing in the third fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. No definition available.
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- Definition
The cash outflow for loan and debt issuance costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. No definition available.
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- Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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