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v3.25.2

Other operating (income) expense, net - Schedule of other operating (income) expense, net (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Other Income and Expenses [Abstract] |  |  |  |
Other operating (income) expense | $ (44) | $ (73) | $ (156) | $ (5,539)
Other operating (income) expense, net | $ (44) | $ (73) | $ (156) | $ (5,539)

X
- Definition Amount of other operating income (expenses), not previously categorized, from items that are associated with the entity's operation. + References No definition available. + Details
Name: | g_OtherOperatingIncomeExpense
Namespace Prefix: | g_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations. + References No definition available. + Details
Name: | us-gaap_OtherOperatingIncomeExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration