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Taxation - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2008
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax [Line Items]        
Favorable statutory tax rate 25.00%      
Undistributed earnings of foreign subsidiaries   $ 12,568,000 $ 19,883,000  
Foreign withholding taxes   1,257,000 $ 1,988,000  
Tax Credit Carryforward, Amount [1]   $ 10,314,000    
PRC Enterprise [Member]        
Income Tax [Line Items]        
Effective income tax rate   25.00%    
Shenzhen Xunlei [Member]        
Income Tax [Line Items]        
Income tax holiday description   Computer was further exempted from EIT for two years commencing from its first year of profitable operation after offsetting prior years tax losses, followed by a 50% reduction for the next three years (2-year Exemption and 3-year 50% Reduction). Computer was further exempted from EIT for two years commencing from its first year of profitable operation after offsetting prior years tax losses, followed by a 50% reduction for the next three years (2-year Exemption and 3-year 50% Reduction). Computer was further exempted from EIT for two years commencing from its first year of profitable operation after offsetting prior years tax losses, followed by a 50% reduction for the next three years (2-year Exemption and 3-year 50% Reduction).
Xunlei Computer [Member]        
Income Tax [Line Items]        
Effective Income Tax Rate Reconciliation, Deduction, Research And Development, Percent   50.00% 50.00% 50.00%
[1] As at December 31, 2017, the deferred tax asset and liability balances are expected to be recoverable as follows