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Summary of Estimated Fair Values of Assets Acquired, Liabilities Assumed and Noncontrolling Interest (Detail)
In Thousands, unless otherwise specified
Dec. 31, 2012
USD ($)
Dec. 31, 2012
CNY
Jul. 20, 2011
Qunar
USD ($)
Jul. 20, 2011
Qunar
CNY
Business Acquisition [Line Items]        
Purchase consideration $ 191,123 1,190,717 $ 300,280 1,939,569
Net assets acquired, excluding intangible assets and the related deferred tax liabilities 14,621 91,095   115,515
Intangible assets, net 106,640 664,380   711,570
Deferred tax liabilities, noncurrent (11,592) (72,222)   (136,856)
Noncontrolling interests (5,218) (32,507)   (102,922)
Redeemable noncontrolling interests (16,067) (100,101)   (942,004)
Pre-existing equity method investments (131,290) (817,951)    
Goodwill $ 234,029 1,458,023   2,294,266