XML 106 R95.htm IDEA: XBRL DOCUMENT v3.25.4

Income Taxes -Income Tax Years Subject To Examination (Detail)	12 Months Ended
	Dec. 31, 2025
US [Member]
Income Tax Years Subject To Examination [Line Items]
Open Tax Year	2022
Belgium
Income Tax Years Subject To Examination [Line Items]
Open Tax Year	2022
France
Income Tax Years Subject To Examination [Line Items]
Open Tax Year	2022
India
Income Tax Years Subject To Examination [Line Items]
Open Tax Year	2023
United Kingdom
Income Tax Years Subject To Examination [Line Items]
Open Tax Year	2022

X

- Definition

Tax year that remains open to examination under enacted tax laws, in YYYY format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-15

+ Details

Name:	us-gaap_OpenTaxYear
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:gYearListItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Income Tax Years Subject To Examination [Line Items].

+ References

No definition available.

+ Details

Name:	zeta_IncomeTaxYearsSubjectToExaminationLineItems
Namespace Prefix:	zeta_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_BE
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_FR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_IN
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: