Organization and Nature of Operations - Additional Information (Detail)
¥ / shares in Units, $ in Thousands, ¥ in Millions
 1 Months Ended 12 Months Ended
Jun. 24, 2014
USD ($)
shares
Dec. 24, 2013
Nov. 30, 2014
shares
May. 31, 2011
CNY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
¥ / shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Variable Interest Entity [Line Items]                
Date of incorporation         Feb. 03, 2005 Feb. 03, 2005    
Number of year's power of attorney retained         10 years 10 years    
Percentage of pre-tax operating profit         80.00% 80.00%    
Service fees payable | $         $ 1,235   $ 1,228
Date of completion of IPO         Jun. 24, 2014 Jun. 24, 2014    
Number of securities issued | shares     10,000,000          
Net proceeds received from IPO | $           $ 93,881
American Depository Shares (ADSs) [Member]                
Variable Interest Entity [Line Items]                
Date of completion of IPO         Jun. 24, 2014 Jun. 24, 2014    
Number of securities issued | shares 8,412,250              
Number of shares equivalent to each ADS 5              
Net proceeds received from IPO | $ $ 89,665              
Exclusive Technology Support and Services Agreement [Member]                
Variable Interest Entity [Line Items]                
Percentage of pre-tax operating profit         20.00% 20.00%    
Exclusive Technology Consulting and Training Agreement [Member]                
Variable Interest Entity [Line Items]                
Percentage of pre-tax operating profit         20.00% 20.00%    
Software and Proprietary Technology License Contract [Member]                
Variable Interest Entity [Line Items]                
Percentage of pre-tax operating profit         40.00% 40.00%    
Giganology (Shenzhen) Co. Ltd [Member]                
Variable Interest Entity [Line Items]                
Date of incorporation         Jun. 30, 2005 Jun. 30, 2005    
Termination of agreement, notice period         30 days 30 days    
Automated extended period of agreement         10 years 10 years    
Agreement expiration date         2022 2022    
Giganology (Shenzhen) Co. Ltd [Member] | Exclusive Technology Support and Services Agreement [Member]                
Variable Interest Entity [Line Items]                
Term agreement expiration year         2025 2025    
Giganology (Shenzhen) Co. Ltd [Member] | Exclusive Technology Consulting and Training Agreement [Member]                
Variable Interest Entity [Line Items]                
Term agreement expiration year         2025 2025    
Shenzhen Xunlei and Xunlei Computer [Member]                
Variable Interest Entity [Line Items]                
License agreement, term   2 years            
Agreement between Giganology Shenzhen and Mr. Sean Shenglong Zou [Member]                
Variable Interest Entity [Line Items]                
Agreement term years         2 years 2 years    
Loan agreements description        
The term of this agreement last for two years from the date it was signed, and will be automatically extended afterwards on a yearly basis until Mr. Zou has repaid the loan in its entirety in accordance with the loan agreement
The term of this agreement last for two years from the date it was signed, and will be automatically extended afterwards on a yearly basis until Mr. Zou has repaid the loan in its entirety in accordance with the loan agreement
    
Additional interest-free loans           ¥ 20    
Increase in registered capital           30    
Agreement between Giganology Shenzhen and Shareholders of Shenzhen Xunlei [Member]                
Variable Interest Entity [Line Items]                
Interest-free loans           ¥ 9    
Agreement term years         2 years 2 years    
Loan agreements description        
The term of these agreements last for two years from the date it was signed, and will be automatically extended afterwards on a yearly basis until each shareholder of Shenzhen Xunlei has repaid the loans in its entirety in accordance with the loan agreement
The term of these agreements last for two years from the date it was signed, and will be automatically extended afterwards on a yearly basis until each shareholder of Shenzhen Xunlei has repaid the loans in its entirety in accordance with the loan agreement
    
Agreement between Giganology Shenzhen and Shenzhen Xunlei [Member]                
Variable Interest Entity [Line Items]                
Increase in registered capital       ¥ 20        
Term agreement expiration year         2016 2016    
Call Option Agreement [Member] | Giganology (Shenzhen) Co. Ltd [Member]                
Variable Interest Entity [Line Items]                
Agreement expiration date         2022 2022    
Outstanding share, purchase price per share | ¥ / shares           ¥ 1