XML 111 R90.htm IDEA: XBRL DOCUMENT v2.4.0.6
Earnings Per Share ("EPS") - Additional Information (Detail)
In Thousands, unless otherwise specified
 4 Months Ended 12 Months Ended 32 Months Ended
May 12, 2010
Dec. 31, 2012
USD ($)
Dec. 31, 2012
CNY
Dec. 31, 2011
CNY
Dec. 31, 2010
CNY
Dec. 31, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]            
Previous Ratio of ADS-to-Class A Ordinary Share one ADS for one share          
Current Ratio of ADS-to-Class A Ordinary Share           ten ADSs for one share
The split whose effect is the same with the entity's change of the ADS to Class A ordinary share ratio         ten-for-one ADS split  
Accretion of redeemable noncontrolling interests   $ 3,554 22,143 0 0