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Long-Term Investments - Schedule of Long-Term Investments (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity method investments:      
Balance at beginning of the year $ 2,785us-gaap_EquityMethodInvestments $ 1,488us-gaap_EquityMethodInvestments  
Additions   1,214xnet_AdditionsToEquityMethodInvestments  
Share of income / (loss) from equity investees (259)us-gaap_IncomeLossFromEquityMethodInvestments 25us-gaap_IncomeLossFromEquityMethodInvestments (45)us-gaap_IncomeLossFromEquityMethodInvestments
Dilution gains arising from deemed disposal of investments 449us-gaap_EquityMethodInvestmentDeferredGainOnSale    
Exchange differences (10)xnet_IncreaseDecreaseInEquityMethodInvestmentDueToForeignCurrencyTranslationAdjustment 58xnet_IncreaseDecreaseInEquityMethodInvestmentDueToForeignCurrencyTranslationAdjustment  
Balance at end of the year 2,965us-gaap_EquityMethodInvestments 2,785us-gaap_EquityMethodInvestments 1,488us-gaap_EquityMethodInvestments
Cost method investments:      
Balance at beginning of the year 164us-gaap_CostMethodInvestments    
Additions 2,359xnet_CostMethodInvestmentsAdditions 162xnet_CostMethodInvestmentsAdditions  
Exchange difference 10xnet_IncreaseDecreaseInCostMethodInvestmentDueToForeignCurrencyTranslationAdjustment 2xnet_IncreaseDecreaseInCostMethodInvestmentDueToForeignCurrencyTranslationAdjustment  
Balance at end of the year 2,533us-gaap_CostMethodInvestments 164us-gaap_CostMethodInvestments  
Total long-term investments $ 5,498us-gaap_LongTermInvestments $ 2,949us-gaap_LongTermInvestments