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Intangible assets, net (Schedule of Weighted Average Amortization Periods of Intangible Assets) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Domain names [Member] |  |
Weighted average amortization periods of intangible assets |  |
Weighted average amortization period | 15 years | 15 years
Technology [Member] |  |
Weighted average amortization periods of intangible assets |  |
Weighted average amortization period | 5 years | 5 years
Software [Member] |  |
Weighted average amortization periods of intangible assets |  |
Weighted average amortization period | 5 years | 5 years
Software [Member] | Minimum [Member] |  |
Weighted average amortization periods of intangible assets |  |
Weighted average amortization period | 3 years |
Software [Member] | Maximum [Member] |  |
Weighted average amortization periods of intangible assets |  |
Weighted average amortization period | 5 years |
Operating rights for licensed games [Member] |  |
Weighted average amortization periods of intangible assets |  |
Weighted average amortization period | 2 years | 3 years
Operating rights for game broadcasting [Member] |  |
Weighted average amortization periods of intangible assets |  |
Weighted average amortization period | 1 year | 1 year
Brand names [Member] |  |
Weighted average amortization periods of intangible assets |  |
Weighted average amortization period |  | 10 years
Brand names [Member] | Minimum [Member] |  |
Weighted average amortization periods of intangible assets |  |
Weighted average amortization period | 1 year |
Brand names [Member] | Maximum [Member] |  |
Weighted average amortization periods of intangible assets |  |
Weighted average amortization period | 15 years |
Others [Member] | Minimum [Member] |  |
Weighted average amortization periods of intangible assets |  |
Weighted average amortization period | 3 years | 3 years
Others [Member] | Maximum [Member] |  |
Weighted average amortization periods of intangible assets |  |
Weighted average amortization period | 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
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | yy_FiniteLivedIntangibleAssetUsefulLifeAbstract
Namespace Prefix: | yy_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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_TechnologyBasedIntangibleAssetsMember
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_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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