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Mortgage Notes Payable and Line of Credit - Additional Information (Detail) (USD $)
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1 Months Ended | 3 Months Ended | ||||
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Mar. 31, 2014
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Aug. 31, 2013
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Mar. 31, 2015
Mortgages
Property
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Dec. 31, 2014
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Nov. 30, 2014
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May 04, 2015
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| Debt Instrument [Line Items] | ||||||
| Number of mortgage notes payable | 42good_NumberOfMortgageNotesPayable | |||||
| Weighted average interest rate on debt outstanding | 5.07%us-gaap_DebtWeightedAverageInterestRate | |||||
| Number of properties collateralized in mortgage notes payable | 96good_NumberOfExistingEncumberedProperties | |||||
| Net book value of collateralized mortgage properties | $ 669,600,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages | |||||
| Number of long-term mortgages issued | 1good_NumberOfLongTermMortgagesIssued | |||||
| Fair value of mortgage notes payable outstanding, excluding mortgage notes payable on real estate held for sale | 485,200,000us-gaap_NotesPayableFairValueDisclosure | |||||
| Borrowings under line of credit | 60,000,000us-gaap_LineOfCredit | 41,300,000us-gaap_LineOfCredit | 43,300,000us-gaap_LineOfCredit | |||
| Line of credit facility, maximum additional amount drawn | 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity | 75,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity | ||||
| Line of credit, maturity date | 2017-08 | |||||
| Extension period subject to payment of fee | 1 year | |||||
| Extension fee on the initial maturity date | 0.25%good_LineOfCreditFacilityPercentageOfExtensionFeeOnInitialMaturity | |||||
| Increase in line of credit facility | 1,300,000us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet | |||||
| Standby letters of credit sublimit | 20,000,000good_StandbyLettersOfCreditSublimit | |||||
| Line of credit, variable spread on interest rate | 3.25%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod | |||||
| Annual maintenance fee | 30,000good_LineOfCreditFacilityAnnualMaintenanceFee | |||||
| Unused commitment fee | 0.25%us-gaap_LineOfCreditFacilityCommitmentFeePercentage | |||||
| Line of credit covenant limit of distributions to stockholders percentage | 100.00%good_LineOfCreditCovenantLimitOfDistributionsToShareholdersPercentage | |||||
| Line of credit at an interest rate | 2.93%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd | |||||
| Subsequent Event [Member] | ||||||
| Debt Instrument [Line Items] | ||||||
| Line of credit facility, maximum additional amount drawn |
18,900,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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| Letter of Credit [Member] | ||||||
| Debt Instrument [Line Items] | ||||||
| Weighted average interest rate on debt outstanding |
2.75%us-gaap_DebtWeightedAverageInterestRate / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember |
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| Letters of credit, outstanding |
4,500,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember |
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| Mortgage Notes Payable [Member] | ||||||
| Debt Instrument [Line Items] | ||||||
| Weighted average interest rate on debt outstanding |
5.26%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = good_MortgageNotesPayableMember |
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| Number of properties collateralized in mortgage notes payable |
78good_NumberOfExistingEncumberedProperties / us-gaap_DebtInstrumentAxis = good_MortgageNotesPayableMember |
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| Excess of LIBOR rate |
3.00%good_DebtInstrumentBaseRate / us-gaap_DebtInstrumentAxis = good_MortgageNotesPayableMember |
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| Carrying value of mortgage notes payable outstanding |
$ 468,418,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = good_MortgageNotesPayableMember |
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| X | ||||||||||
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- Definition
Debt instrument base rate. No definition available.
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| X | ||||||||||
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- Definition
Line of credit covenant limit of distributions to shareholders percentage. No definition available.
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| X | ||||||||||
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- Definition
Line of credit facility annual maintenance fee. No definition available.
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| X | ||||||||||
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- Definition
Line of credit facility expiration month and year. No definition available.
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| X | ||||||||||
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- Definition
Line of credit facility optional extension period. No definition available.
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| X | ||||||||||
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- Definition
Line of credit facility percentage of extension fee on initial maturity. No definition available.
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| X | ||||||||||
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- Definition
Number of existing encumbered properties. No definition available.
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| X | ||||||||||
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- Definition
Number of long term mortgages issued. No definition available.
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| X | ||||||||||
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- Definition
Number of mortgage notes payable. No definition available.
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| X | ||||||||||
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- Definition
Standby letters of credit sublimit. No definition available.
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| X | ||||||||||
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- Definition
Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Weighted average interest rate of debt outstanding. No definition available.
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| X | ||||||||||
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- Definition
The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. No definition available.
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| X | ||||||||||
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- Definition
The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. No definition available.
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| X | ||||||||||
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- Definition
Amount of increase (decrease) of the credit facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The effective interest rate at the end of the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The effective interest rate during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the contractual principal due at the origination of the mortgage loan (face amount). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value portion of notes payable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Details
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- Details
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