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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Estimated Useful lives of Fixed Assets | Fixed assets are stated at cost less accumulated depreciation. Depreciation is recorded on a straight-line basis over the shorter of the estimated useful lives of the assets or the term of the related lease, as follows:
Office building |  | – 45 years
Office building related facility, machinery and equipment |  | – 15 years
Computer equipment |  | – 3 to 5 years
Office equipment |  | – 3 to 5 years
Vehicles |  | – 5 years
Leasehold improvements |  | – over the shorter of lease terms or estimated useful lives of the assets
Intangible Assets, Weighted Average Economic Lives from Date of Purchase | Intangible assets have weighted average economic lives from the date of purchase as follows:
Land use rights |  | – 50 years
Customer relationships |  | – 3 years
Software |  | – 4 years
Trademarks |  | – 10 years
User list |  | – 3 years
Licensed copyrights of video contents |  | – 3 years
Others |  | – 6 years

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- Definition Tabular disclosure of the estimated useful lives of property plant and equipment. + References No definition available. + Details
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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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