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Principal Accounting Policies (Statutory reserves) (Details) ¥ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥)
Schedule of Statutory Reserves [Line Items] |  |  |  |
Appropriations to statutory reserves | ¥ 7.6 | $ 1.1 | ¥ 4.3 | ¥ 15.6
Wholly foreign-owned enterprise [Member] |  |  |  |
Schedule of Statutory Reserves [Line Items] |  |  |  |
Portion of after-tax profit to be allocated to general reserve fund under PRC law (as a percent) | 10.00% | 10.00% |  |
Required general reserve/registered capital ratio to de-force compulsory net profit allocation to general reserve (as a percent) | 50.00% | 50.00% |  |
Domestically funded enterprises [Member] |  |  |  |
Schedule of Statutory Reserves [Line Items] |  |  |  |
Portion of after-tax profit to be allocated to general reserve fund under PRC law (as a percent) | 10.00% | 10.00% |  |
Required general reserve/registered capital ratio to de-force compulsory net profit allocation to general reserve (as a percent) | 50.00% | 50.00% |  |

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- Definition Appropriations to statutory reserve. In accordance with the PRC laws, the company's subsidiary, VIEs and VIEs' subsidiary incorporated in PRC are required to make appropriations to certain non-distributable reserve from their after-tax profit (as determined under the Accounting Standards for Business Enterprises as promulgated by the Ministry of Finance of the People's Republic of China ("PRC GAAP")). + References No definition available. + Details
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- Definition The maximum percentage of the appropriation to the statutory surplus fund over the after-tax profits calculated in accordance with PRC GAAP. + References No definition available. + Details
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- Definition The percentage of the surplus fund over the registered capital of the respective company thus appropriation is not required. + References No definition available. + Details
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- Definition Schedule of statutory reserves [Line Items] + References No definition available. + Details
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- Details
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- Details
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