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Short-Term Borrowings - Narrative (Detail) - USD ($)	1 Months Ended	9 Months Ended	12 Months Ended
	Aug. 31, 2018	Sep. 30, 2021	Dec. 31, 2020	Aug. 09, 2018	Aug. 08, 2018
Line of Credit Facility [Line Items]
Fund-based and non-fund-based credit facilities limits available		$ 20,209,000	$ 14,311,000
Utilization of credit facility for non fund-based usage		$ 4,206,000	$ 7,809,000
Margin over LIBOR (in percentage)	1.375%	1.375%	1.375%
Commitment fee (in percentage)		0.20%	0.20%
Credit facility, amount utilized		$ 2,017,000	$ 252,347,000
Short-term borrowings		$ 0	$ 250,000,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity				$ 500,000,000	$ 350,000,000
Fund-Based Credit Facility
Line of Credit Facility [Line Items]
Margin over LIBOR (in percentage)		1.375%	1.375%
Non-Fund-Based Credit Facility
Line of Credit Facility [Line Items]
Credit facility, amount utilized		$ 2,017,000	$ 2,347,000

X

- Definition

Limit available for fund based and non fund based credit facilities with banks for short term in the form of overdraft, letter of credit, guarantees, short term loans excluding forward hedging.

+ References

No definition available.

+ Details

Name:	g_FundBasedNonFundBasedCreditFacilityLimit
Namespace Prefix:	g_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Utilized amount of borrowed credit facility as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	g_LineOfCreditFacilityAmountUtilized
Namespace Prefix:	g_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

This element represents the margin to be added to LIBOR to arrive at the interest rate to be paid on the credit facility.

+ References

No definition available.

+ Details

Name:	g_MarginOverLiborForInterestRateOnLineOfCredit
Namespace Prefix:	g_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

It represents the fee, expressed as a percentage of the unutilized amount of the line of credit facility.

+ References

No definition available.

+ Details

Name:	g_UnutilizedAmountOfLineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	g_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the utilization of credit facility for non-fund based usage for short term in the form of overdraft, letter of credit, guarantees, short term loans excluding forward hedging.

+ References

No definition available.

+ Details

Name:	g_UtilizationOfCreditFacilityForNonFundBasedUsage
Namespace Prefix:	g_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(1))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=g_FundBasedCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=g_NonFundBasedCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: