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Principal Accounting Policies (Narrative - Liquidity, Functional Currency and Foreign Currency Translation, Short-term Investments, Accounts Receivable, Capitalized Software Development Cost (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Dec. 31, 2015
CNY (¥)
Liquidity          
Net loss $ (225,289) ¥ (1,459,379,000) ¥ (447,858,000) ¥ (79,632,000)  
Net cash provided by/(used in) operating activities (79,462) ¥ (514,735,000) (271,102,000) 116,736,000  
Accumulated deficit $ (359,446)   (869,044,000) (405,580,000) ¥ (2,328,423,000)
Period for which cash, cash equivalents, short-term investments and cash generated from operations will be sufficient to meet working capital requirements and capital expenditures in the ordinary course of business 12 months 12 months      
Functional Currency and Foreign Currency Translation          
Exchange rate 6.4778       6.4778
Short-term Investments          
Other-than-temporary impairment of short-term investments   ¥ 0 0 0  
Accounts Receivable          
Allowance for doubtful accounts     0   ¥ 0
Property and Equipment [Line Items]          
Unamortized amount $ 22,414   72,310,000   145,190,000
Software [Member]          
Property and Equipment [Line Items]          
Cost capitalized   7,572,000 6,837,000 980,000  
Amortization expense   ¥ 2,212,000 ¥ 727,000 ¥ 74,000  
Unamortized amount         ¥ 12,376,000