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Investments - Long-term Investments - Additional information (Detail)
 12 Months Ended 1 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2012
CNY
Dec. 31, 2011
CNY
Dec. 31, 2010
CNY
Dec. 31, 2012
Equity Method Investee Youa
Schedule of Investments [Line Items]          
Carrying amount of cost method investments $ 43,240,000 269,420,000 389,630,000    
Percentage of ordinary shares in equity method investee held by the entity         100.00%
Seats on board of directors of equity method investees         The Company has three out of the total seven seats on the board of directors of Youa and accounted for the investment in Youa under the equity method due to the lack of control of its board of directors and certain substantive participating rights provided to the convertible redeemable preferred shares holders.
Impairment charges on long-term investments $ 27,155,000 169,180,000 47,886,000 0