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Business Combination - Additional Information (Detail)
 12 Months Ended 1 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2012
CNY
Dec. 31, 2011
CNY
Dec. 31, 2010
CNY
Dec. 31, 2012
Equity Method Investee
USD ($)
Dec. 31, 2012
Equity Method Investee
CNY
Jul. 20, 2011
Qunar
USD ($)
Jul. 20, 2011
Qunar
CNY
Business Acquisition [Line Items]                
Business acquisition, contingent consideration $ 0 0            
Business combination, step acquisition, equity interest in acquiree, fair value 131,290,000 817,951,000     131,290,000 817,950,000    
Net gain from step-acquisition and settlement of pre-existing relationship 78,063,000 486,339,000 0 0 78,060,000 486,340,000    
Business combination, effective settlement of the pre-existing relationship 54,320,000 338,450,000            
Business combination, percentage of equity interests acquired             62.01% 62.01%
Business combination, purchase consideration 191,123,000 1,190,717,000         300,280,000 1,939,569,000
Business combination, cash paid upon acquisition             260,100,000  
Business combination, amount deposited in an escrow account             $ 40,180,000  
Business combination, escrow period             18 months 18 months