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Prepayments and other receivables (Schedule of Movements on the Group Provision for Impairment) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Prepayments And Other Receivables [Abstract] |  |
At 1 January | $ 144 | $ 550
Foreign exchange (loss) income | (13) | (25)
Uses | (124) | (381)
At 31 December | $ 7 | $ 144

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- Definition Disclosure Of Prepayments And Other Receivables [Abstract] + References No definition available. + Details
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Namespace Prefix: | gprk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Increase (Decrease) In Provision For Impairment Of Trade And Other Receivables + References No definition available. + Details
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Namespace Prefix: | gprk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase (Decrease) In Provision For Impairment Of Trade And Other Receivables, uses. + References No definition available. + Details
Name: | gprk_IncreaseDecreaseInProvisionForImpairmentOfTradeAndOtherReceivablesUses
Namespace Prefix: | gprk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of provision for impairment of trade and other receivables. + References No definition available. + Details
Name: | gprk_ProvisionForImpairmentOfTradeAndOtherReceivables
Namespace Prefix: | gprk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant