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Interest Income (Expense), Net - Schedule of interest income (expense), net (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Banking and Thrift, Interest [Abstract] |  |  |  |
Interest income | $ 2,068 | $ 1,828 | $ 4,544 | $ 5,229
Interest expense | (14,833) | (14,585) | (42,742) | (43,301)
Interest income (expense), net | $ (12,765) | $ (12,757) | $ (38,198) | $ (38,072)

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- Definition Income derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. + References No definition available. + Details
Name: | g_InterestAndDebtIncome
Namespace Prefix: | g_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Interest and debt related expenses associated with nonoperating financing activities of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
Name: | us-gaap_InterestAndDebtExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The net amount of nonoperating interest income (expense). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration