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Certain Risks and Concentration (Major Customers) (Details) - Customer concentration risk [Member]
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2016
USD ($)
Total revenues [Member]          
Concentration Risk [Line Items]          
Threshold of business risk associated with percentage of quantitative amount generated by any single customer of the Group (as a percent) 10.00% 10.00%      
Total revenues [Member] | CMCC [Member]          
Concentration Risk [Line Items]          
Revenues generated through and from CMCC ¥ 154.6 $ 22.3 ¥ 309.3 ¥ 320.4  
Percentage of concentration risk 10.70% 10.70% 19.20% 19.60%  
Total accounts receivable, net and due from related parties [Member]          
Concentration Risk [Line Items]          
Threshold of business risk associated with percentage of quantitative amount generated by any single customer of the Group (as a percent) 10.00% 10.00%      
Total accounts receivable, net and due from related parties [Member] | CMCC [Member]          
Concentration Risk [Line Items]          
Amounts due from CMCC ¥ 48.8   ¥ 58.3   $ 7.0