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Other income (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Government grants	¥ 88,488		¥ 88,873	¥ 128,550
Others	29,372		24,314	954
Total	¥ 117,860	$ 17,142	¥ 113,187	¥ 129,504

X

- Definition

The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of other government grants income.

+ References

No definition available.

+ Details

Name:	yy_OtherGovernmentGrantsIncome
Namespace Prefix:	yy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of other income which are not separately disclosed on the income statement.

+ References

No definition available.

+ Details

Name:	yy_OtherOperatingIncomeMiscellaneous
Namespace Prefix:	yy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration