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Rental Equipment (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Rental Equipment [Abstract] |  |
Rental equipment, primarily wireless recording equipment | $ 76,245 | $ 55,734
Accumulated depreciation and impairment | (36,700) | (39,272)
Rental equipment, net | $ 39,545 | $ 16,462

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- Definition Rental equipment. + References No definition available. + Details
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Namespace Prefix: | geos_
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Balance Type: | na
Period Type: | duration

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- Definition Rental equipment accumulated depreciation and impairment. + References No definition available. + Details
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Namespace Prefix: | geos_
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Balance Type: | credit
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- Definition Rental equipment gross. + 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 Rental equipment net. + References No definition available. + Details
Name: | geos_RentalEquipmentNet
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant