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Short-Term Borrowings - Narrative (Detail) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2018	Mar. 31, 2024	Dec. 31, 2023	Dec. 13, 2022
Line of Credit Facility [Line Items]
Fund-based and non-fund-based credit facilities limits available		$ 23,248,000	$ 23,302,000
Utilization of credit facility for non fund-based usage		$ 9,277,000	$ 9,336,000
Margin over LIBOR (in percentage)	1.375%
Commitment fee (in percentage)		0.20%	0.20%
Credit facility, amount utilized		$ 51,532,000	$ 11,627,000
Short-term borrowings		$ 50,000,000	$ 10,000,000
2022 facility | Base rate
Line of Credit Facility [Line Items]
Margin over LIBOR (in percentage)		1.375%
2022 facility | Base rate plus applicable margin
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate (in percentage)		0.375%
Minimum | 2022 facility
Line of Credit Facility [Line Items]
Term SOFR adjustment (in percentage)		0.00%	0.00%
Maximum | 2022 facility
Line of Credit Facility [Line Items]
Term SOFR adjustment (in percentage)		0.10%	0.10%
Revolving credit facility
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity				$ 650,000,000
Non fund-based credit facility
Line of Credit Facility [Line Items]
Credit facility, amount utilized		$ 1,532,000	$ 1,627,000

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

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Namespace Prefix:	g_
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Balance Type:	credit
Period Type:	instant

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

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Namespace Prefix:	g_
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Balance Type:	na
Period Type:	duration

X

- Definition

Term SOFR Adjustment

+ References

No definition available.

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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

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Namespace Prefix:	g_
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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

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X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

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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
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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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://www.xbrl.org/2003/role/exampleRef
-Topic 852
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