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Principal accounting policies (Schedule of Property and Equipment Estimated Useful Lives and Residual Rate) (Details) | 12 Months Ended
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Dec. 31, 2016
Buildings [Member] |
Property and equipment [Line Items] |
Estimated useful lives | 40 years
Residual rate (as a percent) | 0.00%
Servers, computers and equipment [Member] |
Property and equipment [Line Items] |
Estimated useful lives | 3 years
Servers, computers and equipment [Member] | Minimum [Member] |
Property and equipment [Line Items] |
Residual rate (as a percent) | 0.00%
Servers, computers and equipment [Member] | Maximum [Member] |
Property and equipment [Line Items] |
Residual rate (as a percent) | 5.00%
Leasehold improvements [Member] |
Property and equipment [Line Items] |
Residual rate (as a percent) | 0.00%
Leasehold improvements [Member] | Maximum [Member] |
Property and equipment [Line Items] |
Estimated useful lives | 5 years
Decoration of buildings [Member] |
Property and equipment [Line Items] |
Estimated useful lives | 10 years
Residual rate (as a percent) | 0.00%
Motor vehicles [Member] |
Property and equipment [Line Items] |
Estimated useful lives | 4 years
Residual rate (as a percent) | 5.00%
Furniture, fixture and office equipment [Member] |
Property and equipment [Line Items] |
Estimated useful lives | 5 years
Furniture, fixture and office equipment [Member] | Minimum [Member] |
Property and equipment [Line Items] |
Residual rate (as a percent) | 0.00%
Furniture, fixture and office equipment [Member] | Maximum [Member] |
Property and equipment [Line Items] |
Residual rate (as a percent) | 5.00%

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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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Period Type: | duration

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- Definition Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Details
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Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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- Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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- Details
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Balance Type: |
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