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Business Combination - Additional Information (Detail)
1 Months Ended 12 Months Ended 1 Months Ended
Oct. 01, 2013
91 Wireless
USD ($)
Dec. 31, 2013
91 Wireless
USD ($)
Dec. 31, 2013
91 Wireless
CNY
Oct. 01, 2013
91 Wireless
CNY
Oct. 01, 2013
91 Wireless
Trademarks
USD ($)
Oct. 01, 2013
91 Wireless
Trademarks
CNY
Oct. 01, 2013
91 Wireless
Customer relationships
USD ($)
Oct. 01, 2013
91 Wireless
Customer relationships
CNY
Oct. 01, 2013
91 Wireless
Software
USD ($)
Oct. 01, 2013
91 Wireless
Software
CNY
Oct. 01, 2013
91 Wireless
Developer Relationship
USD ($)
Oct. 01, 2013
91 Wireless
Developer Relationship
CNY
Oct. 01, 2013
91 Wireless
User List
USD ($)
Oct. 01, 2013
91 Wireless
User List
CNY
Jul. 20, 2011
Qunar
USD ($)
Jul. 20, 2011
Qunar
CNY
Business Acquisition [Line Items]                                
Business combination, percentage of voting interests acquired 100.00%                              
Business combination, cash paid upon acquisition $ 1,830,000,000                              
Business combination, amount deposited in an escrow account 10,000,000                              
Business combination, escrow period 18 months                              
The fair value of acquired intangible assets 189,355,000     1,146,300,000 47,740,000 289,000,000 49,890,000 302,000,000 18,850,000 114,100,000 13,450,000 81,400,000 59,430,000 359,800,000   711,570,000
Intangible assets, useful life         10 years 10 years 3 years 3 months 18 days 3 years 3 months 18 days 5 years 3 months 18 days 5 years 3 months 18 days 2 years 3 months 18 days 2 years 3 months 18 days 3 years 3 months 18 days 3 years 3 months 18 days    
Business combination, acquisition related costs   2,760,000 16,700,000                          
Business combination, amount of revenue of the acquiree included in the Company's consolidated statements of comprehensive income from the acquisition date   42,920,000 259,840,000                          
Business combination, amount of net income of the acquiree included in the Company's consolidated statements of comprehensive income from the acquisition date   4,600,000 27,840,000                          
Business combination, percentage of equity interests acquired                               62.01%
Business combination, purchase consideration                             $ 300,280,000