Commitments and Contingencies - Schedule of Future Minimum Purchase Commitments (Detail) $ in Millions	Sep. 30, 2021 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Remaining 2021	$ 12.5
2022	42.9
2023	33.6
2024	16.5
Thereafter	0.0
Total	$ 105.5

No definition available.

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- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

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

- Definition

Amount of commitment classified as other to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Amount of commitment classified as other to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitmentDueInSecondYear
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Data Type:	xbrli:monetaryItemType
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- Definition

Amount of commitment classified as other to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitmentDueInThirdYear
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Data Type:	xbrli:monetaryItemType
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- Definition

Amount of commitment classified as other to be paid in remainder of current fiscal year.

+ References

No definition available.

+ Details

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- Definition

Other commitment due after third year.

+ References

No definition available.

+ Details

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Namespace Prefix:	znga_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant