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Certain risks and concentration - Additional Information (Detail)
12 Months Ended
Dec. 31, 2019
USD ($)
customer
Dec. 31, 2018
USD ($)
Dec. 31, 2017
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 50.00%    
Retained earnings and distributable reserves $ (166,973,000) $ (113,804,000)  
Number of top customers accounted for net revenues | customer 10    
Intercompany balance included in accounts payable $ 19,875,000 25,703,000  
Accrued Liabilities and Other Liabilities, Inter-companies Balance 152,904,000 118,259,000  
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries $ 245,918,000 $ 144,433,000  
Sales Revenue, Net [Member] | Customer concentration risk [Member]      
Concentration Risk [Line Items]      
Percentage of net revenues accounted from customers 31.00% 23.00% 27.00%
Variable Interest Entity, Primary Beneficiary [Member]      
Concentration Risk [Line Items]      
Retained earnings and distributable reserves $ 119,097,000 $ 67,747,000  
Shenzhen Xunlei      
Concentration Risk [Line Items]      
Term of operating contract 10 years