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Other Assets - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Allowance for credit losses, other assets | $ 3,711 | $ 3,134
Allowance for credit losses current period charge | $ 577 | 2,400
ASC 326 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Transition period adjustment on accounts receivables (through retained earnings) pursuant to ASC 326 |  | $ 734

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- Definition Allowance For Credit Losses Other Assets + References No definition available. + Details
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Namespace Prefix: | g_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Allowance For Credit Losses Other Assets Current Period Charge + References No definition available. + Details
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Namespace Prefix: | g_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Change in deferred billings allowance for credit losses. + References No definition available. + Details
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Namespace Prefix: | g_
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
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |