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Principal Accounting Policies (Narrative - Intangible Assets) (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Intangible assets, net [Line Items]      
Impairment of intangible assets ¥ 0 ¥ 0 ¥ 0
Computer software [Member]      
Intangible assets, net [Line Items]      
Estimated useful lives 3 years    
Separately identifiable intangible assets arising from acquisitions and business cooperation agreement [Member] | Minimum [Member]      
Intangible assets, net [Line Items]      
Estimated useful lives 3 years 6 months    
Separately identifiable intangible assets arising from acquisitions and business cooperation agreement [Member] | Maximum [Member]      
Intangible assets, net [Line Items]      
Estimated useful lives 20 years