Goodwill and Intangible Assets, net - Estimated Future Amortization Expense for Intangible Assets (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2022	$ 60,793
2023	38,882
2024	30,116
2025	21,337
2026	12,605
Thereafter	34,971
Total future amortization expense	$ 198,704

No definition available.

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

Finite-Lived Intangible Assets And Future Commitments, Amortization Expense, After Year Five

No definition available.

Name:	z_FiniteLivedIntangibleAssetsAndFutureCommitmentsAmortizationExpenseAfterYearFive
Namespace Prefix:	z_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Finite-Lived Intangible Assets And Future Commitments, Amortization Expense, Year Five

No definition available.

Name:	z_FiniteLivedIntangibleAssetsAndFutureCommitmentsAmortizationExpenseYearFive
Namespace Prefix:	z_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Finite-Lived Intangible Assets And Future Commitments, Amortization Expense, Year Four

No definition available.

Name:	z_FiniteLivedIntangibleAssetsAndFutureCommitmentsAmortizationExpenseYearFour
Namespace Prefix:	z_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Finite-Lived Intangible Assets And Future Commitments, Amortization Expense, Year One

No definition available.

Name:	z_FiniteLivedIntangibleAssetsAndFutureCommitmentsAmortizationExpenseYearOne
Namespace Prefix:	z_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Finite-Lived Intangible Assets And Future Commitments, Amortization Expense, Year Three

No definition available.

Name:	z_FiniteLivedIntangibleAssetsAndFutureCommitmentsAmortizationExpenseYearThree
Namespace Prefix:	z_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Finite-Lived Intangible Assets And Future Commitments, Amortization Expense, Year Two

No definition available.

Name:	z_FiniteLivedIntangibleAssetsAndFutureCommitmentsAmortizationExpenseYearTwo
Namespace Prefix:	z_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Future Amortization Expense Including Intangible Assets And Future Commitments

No definition available.

Name:	z_FutureAmortizationExpenseIncludingIntangibleAssetsAndFutureCommitments
Namespace Prefix:	z_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant