XML 149 R135.htm IDEA: XBRL DOCUMENT v3.22.4

Income taxes - Schedule of change in total valuation allowance for deferred tax assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Opening valuation allowance	$ 212,192	$ 206,011	$ 62,628
Reduction during the year	(214)	(1,206)	(35,662)
Addition during the year	10,677	7,387	179,045
Closing valuation allowance	$ 222,655	$ 212,192	$ 206,011

X

- Definition

The amount of the increase in the period in the valuation allowance for deferred tax assets.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of the reduction in the period in the valuation allowance for deferred tax assets.

+ References

No definition available.

+ Details

Name:	g_ValuationAllowanceDeferredTaxAssetChangeInAmountReductions
Namespace Prefix:	g_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

+ Details

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

X

- References

No definition available.

+ Details

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