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Taxation - Summary of Changes in Deferred Tax Asset and Liability Balances (Parenthetical) (Detail) - Dec. 31, 2017
¥ in Millions
USD ($)
CNY (¥)
Income Tax [Line Items]    
Net operating tax loss carryforwards [1] $ 10,314,000  
Deferred tax liabilities 0  
Shenzhen Xunlei [Member]    
Income Tax [Line Items]    
Capitalized software sold at market valuation $ 6,400,000 ¥ 42
[1] As at December 31, 2017, the deferred tax asset and liability balances are expected to be recoverable as follows