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Related Party Transactions - Schedule of Relationship Between Related Parties with their Groups (Detail)
12 Months Ended
Dec. 31, 2014
Zhuhai Qianyou [Member]  
Schedule of Other Related Party Transactions [Line Items]  
Related parties relationship Equity investment of the Group
Hao Cheng [Member]  
Schedule of Other Related Party Transactions [Line Items]  
Related parties relationship Co-founder and shareholder of the Group
Chuan Wang [Member]  
Schedule of Other Related Party Transactions [Line Items]  
Related parties relationship Director of the Company
Shenglong Zou [Member]  
Schedule of Other Related Party Transactions [Line Items]  
Related parties relationship Co-founder and shareholder of the Group
Beijing Millet technology Co., LTD ("Beijing Xiaomi") [Member]  
Schedule of Other Related Party Transactions [Line Items]  
Related parties relationship Company owned by a shareholder of the Group
Leading Advice Holdings Limited [Member]  
Schedule of Other Related Party Transactions [Line Items]  
Related parties relationship Company owned by a Co-founder and shareholder of the Group
Vantage Point Global Limited [Member]  
Schedule of Other Related Party Transactions [Line Items]  
Related parties relationship Shareholder of the Company
Aiden & Jasmine Limited [Member]  
Schedule of Other Related Party Transactions [Line Items]  
Related parties relationship Shareholder of the Company
Kingsoft Corporation Limited [Member]  
Schedule of Other Related Party Transactions [Line Items]  
Related parties relationship Shareholder of the Company