Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

Name:	us-gaap_ProceedsFromDivestitureOfBusinesses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of consideration subject to certain conditions, received or receivable for the disposal of assets and liabilities, including discontinued operation.

No definition available.

Name:	yy_DisposalGroupIncludingDiscontinuedOperationConsiderationSubjectToConditions
Namespace Prefix:	yy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

n/a

No definition available.

Name:	yy_OrganizationAndPrincipalActivitiesLineItems
Namespace Prefix:	yy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the amount of the consolidated variable interest entity's registered capital and PRC statutory reserves.

No definition available.

Name:	yy_VariableInterestEntityConsolidatedRegisteredCapitalAndForeignStatutoryReserves
Namespace Prefix:	yy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=yy_YyLiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsHeldforsaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsDisposedOfBySaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: