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Principal accounting policies (Schedule of Amortization of Finite-lived Intangible Assets is Computed Using Straight-line Method Over Following Estimated Useful Lives) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Brand names [Member] |  |
Intangible assets, net [Line Items] |  |
Estimated useful lives |  | 10 years
Brand names [Member] | Minimum [Member] |  |
Intangible assets, net [Line Items] |  |
Estimated useful lives | 1 year |
Brand names [Member] | Maximum [Member] |  |
Intangible assets, net [Line Items] |  |
Estimated useful lives | 15 years |
Software [Member] |  |
Intangible assets, net [Line Items] |  |
Estimated useful lives | 5 years | 5 years
Software [Member] | Minimum [Member] |  |
Intangible assets, net [Line Items] |  |
Estimated useful lives | 3 years |
Software [Member] | Maximum [Member] |  |
Intangible assets, net [Line Items] |  |
Estimated useful lives | 5 years |
Domain names [Member] |  |
Intangible assets, net [Line Items] |  |
Estimated useful lives | 15 years | 15 years
Technology [Member] |  |
Intangible assets, net [Line Items] |  |
Estimated useful lives | 5 years |
Others [Member] | Minimum [Member] |  |
Intangible assets, net [Line Items] |  |
Estimated useful lives | 3 years | 3 years
Others [Member] | Maximum [Member] |  |
Intangible assets, net [Line Items] |  |
Estimated useful lives | 5 years | 5 years

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=yy_BrandNameMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_ComputerSoftwareIntangibleAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_InternetDomainNamesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_PatentedTechnologyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_OtherIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |