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Accounts and Financing Receivables - Additional Information (Details) - Rental equipment $ in Millions | Sep. 30, 2018 USD ($)
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Accounts Notes And Loans Receivable [Line Items] |
Interest rate | 5.00%
Term of sales-type lease | 3 years
Future minimum lease payments | $ 5.8
Future minimum lease payments of unearned income | 0.2
Future minimum lease payments, 2019 | 2.9
Future minimum lease payments, 2020 | $ 2.9

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- Definition Notes receivable interest rate. + References No definition available. + Details
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Namespace Prefix: | geos_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Sales type lease minimum lease payments to be received. + References No definition available. + Details
Name: | geos_SalesTypeLeaseMinimumLeasePaymentsToBeReceived
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Sales type lease minimum lease payments to be received next twelve months. + References No definition available. + Details
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Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Sales type lease minimum lease payments to be received of unearned income. + References No definition available. + Details
Name: | geos_SalesTypeLeaseMinimumLeasePaymentsToBeReceivedOfUnearnedIncome
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Sales type lease minimum lease payments to be received two years. + References No definition available. + Details
Name: | geos_SalesTypeLeaseMinimumLeasePaymentsToBeReceivedTwoYears
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Term of lessor's sales-type lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919359-209981 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_ProductOrServiceAxis=geos_ManufacturedRentalEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |