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Certain risks and concentration - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Customer
Dec. 31, 2016
USD ($)
Dec. 31, 2015
Concentration Risk [Line Items]      
Maximum foreign ownership in internet information provider or other value-added telecommunication service provider's business allowed under PRC laws and regulations [1] 50.00%    
Retained earnings and distributable reserves $ (74,526) $ (36,704)  
Number of top customers accounted for net revenues | Customer 10    
Accounts Payable,Inter-companies Balance, Current $ 18,704,000 9,360,000  
Accrued Liabilities and Other Liabilities, Inter-companies Balance $ 74,394,000 $ 91,477,000  
Net revenues [Member] | Customer concentration risk [Member]      
Concentration Risk [Line Items]      
Percentage of net revenues accounted from customers 27.00% 18.00% 26.00%
Variable Interest Entity, Primary Beneficiary [Member]      
Concentration Risk [Line Items]      
Retained earnings and distributable reserves $ 32,222,000    
Variable Interest Entity, Not Primary Beneficiary [Member]      
Concentration Risk [Line Items]      
Retained earnings and distributable reserves   $ 2,541,000  
[1] In June 2017, the Group disposed of entire interests (10%) in Kushiduo with a carrying value of USD 383,000 at a consideration of approximately USD 191,500. As a result of the disposal, the Group recognized in a disposal loss of USD 191,500 in the other income, net (Note 23).