XML 70 R49.htm IDEA: XBRL DOCUMENT
v3.19.3

Credit Facilities - Credit Facility (Details) € in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2019 USD ($) | Apr. 12, 2019 leased_office_and_industrial_property | Jul. 02, 2018 EUR (€) | Jul. 02, 2018 USD ($) | Jul. 24, 2017 USD ($) extension | Apr. 30, 2019 | Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 EUR (€) | Sep. 30, 2019 USD ($) | Aug. 01, 2019 EUR (€) | Aug. 01, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  | $ 101,405,000 |  |  |  | $ 363,894,000
Repayments on revolving credit facilities |  |  |  |  |  |  |  | $ 499,649,000 | $ 87,375,000 |  |  |  |  |  |
Maximum distribution as percentage of FFO |  |  |  |  |  | 95.00% |  |  |  |  |  |  |  |  |
Maximum distribution as percentage of FFO, under exception |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Maximum distribution as percentage of AFFO |  |  |  |  |  | 105.00% |  |  |  |  |  |  |  |  |
Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average effective interest rate |  |  |  |  |  |  |  |  |  | 2.20% | 2.20% |  |  |  |
Increase in outstanding balance | $ 39,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility | Federal Funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on base rate determination |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |
Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on base rate determination |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread |  |  |  |  | 1.60% |  |  |  |  |  |  |  |  |  |
Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread |  |  |  |  | 2.20% |  |  |  |  |  |  |  |  |  |
Credit Facility | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread |  |  |  |  | 0.60% |  |  |  |  |  |  |  |  |  |
Credit Facility | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread |  |  |  |  | 1.20% |  |  |  |  |  |  |  |  |  |
Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  | $ 101,400,000 |  | $ 170,700,000 | $ 259,500,000 |
Available for future borrowings |  |  |  |  |  |  |  |  |  |  | 101,200,000 |  |  |  |
Repayments on revolving credit facilities |  |  |  |  |  |  | $ 70,000,000.0 |  |  |  |  |  |  |  |
Credit Facility | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  | 389,900,000 | € 359.6 | 400,000,000.0 | $ 277,400,000 |
Credit Facility | KeyBank National Association | Unsecured debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 950,000,000.0 | $ 725,000,000.0 |  |  |  |  |  |  |  |  |  |
Increase in aggregate commitments |  |  |  |  | $ 35,600,000 |  |  |  |  |  |  |  | 515,000,000.0 |  |
Total line of credit commitment |  |  |  |  |  |  |  |  |  |  |  |  | 1,750,000,000 |  |
Number of extensions | extension |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Extension term |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |
Credit Facility | KeyBank National Association | Unsecured debt | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 722,200,000 |  |  |  |  |  |  |  |  |  |
Credit Facility | KeyBank National Association | Unsecured debt | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 914,400,000 |  |  |  |  |  |  |  |  |  |  |
Credit Facility | KeyBank National Association | Unsecured debt | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | 835,000,000.0 |  | 835,000,000.0 |  |
Increase in maximum borrowing capacity |  |  |  | 132,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Facility fee multiplier |  |  |  |  | 0.0030 |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  | 101,405,000 |  |  |  | $ 363,894,000
Credit Facility | KeyBank National Association | Unsecured debt | Revolving Credit Facility | Above Threshold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unused capacity commitment fee |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Credit Facility | KeyBank National Association | Unsecured debt | Revolving Credit Facility | Below Threshold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unused capacity commitment fee |  |  |  |  | 0.15% |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Credit Facility | KeyBank National Association | Unsecured debt | Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | € 359.6 | $ 392,500,000 |  |  |  |
Increase in maximum borrowing capacity |  |  | € 51.8 | $ 60,200,000 |  |  |  |  |  |  |  |  |  |  |
Credit Facility Amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,235,000,000 |  |
Credit Facility Amendment | Revolving Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread | 1.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility Amendment | Revolving Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread | 2.05% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility Amendment | Revolving Credit Facility | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread | 0.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility Amendment | Revolving Credit Facility | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread | 1.05% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility Amendment | Term Loan | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread | 1.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility Amendment | Term Loan | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility Amendment | Term Loan | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread | 0.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility Amendment | Term Loan | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multi-Tenant Mortgage Loan IV | Column Financial, Inc. and Societe Generale Financial Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral, number of leased offices and industrial properties | leased_office_and_industrial_property |  | 16 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states in which mortgaged properties are located (state) | leased_office_and_industrial_property |  | 12 |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Debt Instrument, Basis Spread On Base Rate + References No definition available. + Details
Name: | gnl_DebtInstrumentBasisSpreadOnBaseRate
Namespace Prefix: | gnl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Collateral, Number Of Leased Offices And Industrial Properties + References No definition available. + Details
Name: | gnl_DebtInstrumentCollateralNumberOfLeasedOfficesAndIndustrialProperties
Namespace Prefix: | gnl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Maximum Distribution, Percentage of FFO + References No definition available. + Details
Name: | gnl_DebtInstrumentMaximumDistributionPercentageofFFO
Namespace Prefix: | gnl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Maximum Distribution Under Exemption, Percentage Of AFFO + References No definition available. + Details
Name: | gnl_DebtInstrumentMaximumDistributionUnderExemptionPercentageOfAFFO
Namespace Prefix: | gnl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Maximum Distribution Under Exemption, Percentage Of FFO + References No definition available. + Details
Name: | gnl_DebtInstrumentMaximumDistributionUnderExemptionPercentageOfFFO
Namespace Prefix: | gnl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Number Of States In Which Mortgaged Properties Are Located + References No definition available. + Details
Name: | gnl_DebtInstrumentNumberOfStatesInWhichMortgagedPropertiesAreLocated
Namespace Prefix: | gnl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line Of Credit Facility, Accordion Feature, Higher Borrowing Capacity Option + References No definition available. + Details
Name: | gnl_LineOfCreditFacilityAccordionFeatureHigherBorrowingCapacityOption
Namespace Prefix: | gnl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line of Credit Facility, Commitment Fee Percentage, Threshold, Unused Capacity as a Percentage of Current Capacity + References No definition available. + Details
Name: | gnl_LineOfCreditFacilityCommitmentFeePercentageThresholdUnusedCapacityAsPercentageOfCurrentCapacity
Namespace Prefix: | gnl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line Of Credit Facility, Increase (Decrease) In Maximum Borrowing Capacity + References No definition available. + Details
Name: | gnl_LineOfCreditFacilityIncreaseDecreaseInMaximumBorrowingCapacity
Namespace Prefix: | gnl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line Of Credit Facility, Number Of Extensions + References No definition available. + Details
Name: | gnl_LineOfCreditFacilityNumberOfExtensions
Namespace Prefix: | gnl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line of Credit Facility, Accordion Feature, Increase Limit + References No definition available. + Details
Name: | gnl_LineofCreditFacilityAccordionFeatureIncreaseLimit
Namespace Prefix: | gnl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line of Credit Facility, Extension Term + References No definition available. + Details
Name: | gnl_LineofCreditFacilityExtensionTerm
Namespace Prefix: | gnl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line of Credit Facility, Unused Capacity, Facility Fee Multiplier + References No definition available. + Details
Name: | gnl_LineofCreditFacilityUnusedCapacityFacilityFeeMultiplier
Namespace Prefix: | gnl_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net increase or decrease in the carrying amount of the debt instrument for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_DebtInstrumentIncreaseDecreaseForPeriodNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average interest rate of long-term debt outstanding calculated at point in time. + References No definition available. + Details
Name: | us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_RepaymentsOfLinesOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gnl_SeniorUnsecuredMultiCurrencyRevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_FederalFundsEffectiveSwapRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=gnl_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=gnl_KeyBankNationalAssociationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gnl_MutuallyExclusiveOptionAxis=gnl_AboveThresholdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gnl_MutuallyExclusiveOptionAxis=gnl_BelowThresholdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=gnl_TermLoanFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gnl_CreditFacilityAmendmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=gnl_ColumnFinancialInc.andSocieteGeneraleFinancialCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |