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Prepayments and Other Assets - Schedule of Prepayments and Other Assets (Parenthetical) (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Low-interest employee loan repayable period 10 years
Share repurchase program amount $ 20,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Prepaid amount to security broker $ 1,000,000xnet_PrepaymentForShareRepurchasePlan