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Related Party Balances (Parenthetical) (Detail) - Qunar
¥ in Thousands, $ in Thousands
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Oct. 31, 2015
USD ($)
Related Party Transaction [Line Items]      
Short-term loan receivable $ 273,860 ¥ 1,774,000  
Short-term loan payable     $ 100,000