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Intangible Assets, Net - Schedule of Weighted Average Amortization Periods of Intangible Assets (Detail) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average amortization periods of intangible assets | 3 years 11 months 19 days | 4 years 15 days
Content Copyrights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average amortization periods of intangible assets | 2 years 9 months 11 days | 2 years 9 months 29 days
Land use right [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average amortization periods of intangible assets | 30 years | 30 years
Trademarks [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average amortization periods of intangible assets | 7 years |
Non-compete agreement [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average amortization periods of intangible assets | 4 years |
Technology (including right-to-use) [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average amortization periods of intangible assets | 8 years |
Acquired computer software [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average amortization periods of intangible assets | 5 years | 5 years
Internal use software development costs [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average amortization periods of intangible assets | 5 years | 5 years
Online game licenses [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average amortization periods of intangible assets | 3 years | 3 years
Domain name [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average amortization periods of intangible assets | 5 years | 5 years

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- Definition Weighted average period before the next renewal or extension (both explicit and implicit) for intangible assets that have been renewed or extended, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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