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Principal Accounting Policies (Revenue recognition) (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Principal Accounting Policies [Abstract]        
Agency service fees to third-party advertising agencies ¥ 169.6 $ 24.4 ¥ 161.6 ¥ 176.8
Revenue from barter transactions involving exchanging advertising services for content, technical, application pre-installation services and others ¥ 2.8 $ 0.4 ¥ 1.4 ¥ 1.0