XML 46 R35.htm IDEA: XBRL DOCUMENT
v3.20.2

Commitments and Contingencies - Additional Information (Detail) |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 17, 2017 Defendant | Jun. 16, 2016 USD ($) | Mar. 04, 2016 USD ($) | Jul. 07, 2014 Defendant | Dec. 12, 2013 | May 31, 2007 Defendant | Sep. 30, 2003 Party Defendant | Jun. 30, 2020 USD ($) Defendant | Jun. 30, 2018 Defendant | Dec. 31, 2004 Entity | Dec. 31, 2019 USD ($) | Jan. 31, 2018 USD ($) Party | Mar. 30, 2017 Party
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued legal matters | $ |  |  |  |  |  |  |  | $ 17,788,000 |  |  | $ 17,820,000 |  |
Number of third party defendants over which defendants asserted third party claims seeking contribution or cost recovery |  |  |  |  |  |  | 300 |  |  |  |  |  |
Litigation settlement interest, percent |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
EPA [Member] | Occidental Chemical Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of potentially responsible parties | Party |  |  |  |  |  |  |  |  |  |  |  |  | 20
Number of potentially responsible parties that the EPA intends to enter into a final settlement agreement with | Party |  |  |  |  |  |  |  |  |  |  |  | 15 |
Remediation cost for identified responsible parties | $ |  |  |  |  |  |  |  |  |  |  |  | $ 280,600 |
8 Mile Stretch of Lower Passaic River [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cost estimate for remediating Lower Passaic River | $ |  |  | $ 1,380,000,000 |  |  |  |  |  |  |  |  |  |
Minimum [Member] | CERCLA [Member] | Occidental Chemical Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of defendants under complaint |  |  |  |  |  |  |  |  | 120 |  |  |  |
Minimum [Member] | 17 Mile Stretch of Lower Passaic River [Member] | EPA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of entities to which general notice letters issued | Entity |  |  |  |  |  |  |  |  |  | 100 |  |  |
Lower Passaic River [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of potentially responsible parties | Party |  |  |  |  |  |  | 66 |  |  |  |  |  |
Lower Passaic River [Member] | YPF [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of bankruptcy amount | $ |  | $ 130,000,000 |  |  |  |  |  |  |  |  |  |  |
Lower Passaic River [Member] | Minimum [Member] | 17 Mile Stretch of Lower Passaic River [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Parties to perform a remedial investigation and feasibility study |  |  |  |  |  | 70 |  |  |  |  |  |  |
MTBE [Member] | NJ [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of defendants in the MTBE complaint |  |  |  |  |  |  |  | 50 |  |  |  |  |
MTBE [Member] | Minimum [Member] | PA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of defendants in the MTBE complaint |  |  |  | 50 |  |  |  |  |  |  |  |  |
MTBE [Member] | Minimum [Member] | MARYLAND [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of defendants in the MTBE complaint | 60 |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable related to legal proceedings and claims which have arisen in the ordinary course of business. + References No definition available. + Details
Name: | gty_AccruedLegalMatters
Namespace Prefix: | gty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of the cash payout owed as part of the final settlement agreement with 15 of the 20 identified parties.. + References No definition available. + Details
Name: | gty_AmountOfCashPayoutOwedByResponsibleParties
Namespace Prefix: | gty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The estimated remediation cost to be divided among responsible parties. + References No definition available. + Details
Name: | gty_EstimatedRemediationCostResponsiblePartyAllocation
Namespace Prefix: | gty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Litigation settlement interest, percent. + References No definition available. + Details
Name: | gty_LitigationSettlementInterestPercent
Namespace Prefix: | gty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of defendants under complaint filed by Occidental. + References No definition available. + Details
Name: | gty_NumberOfDefendantsUnderComplaint
Namespace Prefix: | gty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of entities to which general notice letters issued. + References No definition available. + Details
Name: | gty_NumberOfEntitiesToWhichGeneralNoticeLettersIssued
Namespace Prefix: | gty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of parties potentially responsible. + References No definition available. + Details
Name: | gty_NumberOfPotentiallyResponsibleParties
Namespace Prefix: | gty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of potentially responsible parties that the EPA intends to enter into a final settlement agreement with. + References No definition available. + Details
Name: | gty_NumberOfPotentiallyResponsiblePartiesIdentifiedForFinalSettlement
Namespace Prefix: | gty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of third party defendants over which defendants asserted third party claims seeking contribution or cost recovery. + References No definition available. + Details
Name: | gty_NumberOfThirdPartyDefendantsOverWhichDefendantsAssertedThirdPartyClaimsSeekingContributionOrCostRecovery
Namespace Prefix: | gty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of parties required to perform a remedial investigation and feasibility study. + References No definition available. + Details
Name: | gty_PartiesToPerformRemedialInvestigationAndFeasibilityStudy
Namespace Prefix: | gty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash outflow to creditors related to liabilities subject to compromise pursuant to bankruptcy court orders for prepetition contingencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585 + Details
Name: | us-gaap_LiabilitiesSubjectToCompromisePaymentsUnderBankruptcyCourtOrderForResolutionsOfContingenciesSubjectToChapter11
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of defendants named in a legal action. + References No definition available. + Details
Name: | us-gaap_LossContingencyNumberOfDefendants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=gty_EnvironmentalProtectionAgencyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=gty_OccidentalChemicalCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=gty_EightMileStretchOfLowerPassaicRiverMember
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: | us-gaap_RegulatoryAgencyAxis=gty_ComprehensiveEnvironmentalResponseCompensationAndLiabilityActMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=gty_SeventeenMileStretchOfLowerPassaicRiverMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=gty_LowerPassaicRiverMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=gty_YPFMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=gty_MethylTertiaryButylEtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_NJ
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_PA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_MD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |