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Principal accounting policies (Revenue Recognition and Cost of Revenues - Narrative) (Details) $ in Thousands |  | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Jun. 01, 2014 | Dec. 31, 2015 USD ($) item | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 item
Cost of revenues |  |  |  |  |
Tax rate on service income from provision of advertising services in the PRC (as a percent) |  | 3.00% |  |  |
Surcharges on business taxes and VAT (as a percent) |  | 12.00% | 12.00% | 12.00% |
Minimum [Member] |  |  |  |  |
Cost of revenues |  |  |  |  |
VAT (as a percent) |  | 6.00% |  |  |
Maximum [Member] |  |  |  |  |
Cost of revenues |  |  |  |  |
VAT (as a percent) |  | 17.00% |  |  |
IVAS revenue [Member] |  |  |  |  |
Cost of revenues |  |  |  |  |
Business taxes prior to the Pilot Program's being applied (as a percent) | 3.00% |  |  |  |
Online games revenue [Member] |  |  |  |  |
Cost of revenues |  |  |  |  |
VAT (as a percent) | 6.00% |  |  |  |
Third party developed online games [Member] |  |  |  |  |
Revenue recognition [Line Items] |  |  |  |  |
Number of types of third party developed online games |  | 2 |  |  |
Third party developed online games [Member] | Minimum [Member] |  |  |  |  |
Revenue recognition [Line Items] |  |  |  |  |
Period of revenue-sharing contracts |  | 1 year |  |  |
Estimated user relationship period |  | 1 month |  |  |
Third party developed online games [Member] | Maximum [Member] |  |  |  |  |
Revenue recognition [Line Items] |  |  |  |  |
Period of revenue-sharing contracts |  | 2 years |  |  |
Estimated user relationship period |  | 6 months |  |  |
Online music and entertainment revenue [Member] |  |  |  |  |
Revenue recognition [Line Items] |  |  |  |  |
Maximum period over which each virtual item is made available to the user |  | 1 year |  |  |
Number of arrangements into which virtual items may be sold individually or bundled |  | 1 |  |  |
Advertising revenues [Member] | Minimum [Member] |  |  |  |  |
Revenue recognition [Line Items] |  |  |  |  |
Advertising revenues contract term |  | 1 month |  |  |
Advertising revenues [Member] | Maximum [Member] |  |  |  |  |
Revenue recognition [Line Items] |  |  |  |  |
Advertising revenues contract term |  | 3 months |  |  |
Period over which payments are due |  | 6 months |  |  |
Online Education Revenues [Member] |  |  |  |  |
Revenue recognition [Line Items] |  |  |  |  |
Number of trial class of the purchased course |  | 1 |  |  | 1
Amount of refund to be provided to student who withdraws fund after the trial period | $ |  | $ 0 |  |  |
Initial course term |  |  |  |  | 6 months

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