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Rental Equipment (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
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Rental Equipment [Abstract] |  |
Rental equipment, primarily wireless recording equipment | $ 68,959 | $ 75,359
Accumulated depreciation and impairment | (37,986) | (29,323)
Rental equipment, net | $ 30,973 | $ 46,036

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- Definition Rental equipment. + References No definition available. + Details
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- Definition Rental equipment accumulated depreciation and impairment. + References No definition available. + Details
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Balance Type: | credit
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- Definition Rental equipment gross. + References No definition available. + Details
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Balance Type: | debit
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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