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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies and General Information [Line Items]        
Allowance for doubtful accounts $ 9,352,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 12,111,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 7,875,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 4,150,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Impairment of long-term investments 0us-gaap_ImpairmentOfInvestments 0us-gaap_ImpairmentOfInvestments 0us-gaap_ImpairmentOfInvestments  
Fair value of a reporting unit less than carrying amount, including goodwill 50.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount      
Goodwill impairment losses 0us-gaap_GoodwillImpairmentLoss      
Sales rebates provided to the agencies and advertisers 5,005,000us-gaap_SalesDiscountsServices 7,207,000us-gaap_SalesDiscountsServices 7,414,000us-gaap_SalesDiscountsServices  
Content sub-licensing revenue 9,218,000us-gaap_LicenseAndServicesRevenue 7,369,000us-gaap_LicenseAndServicesRevenue 15,234,000us-gaap_LicenseAndServicesRevenue  
Net proceeds from barter transactions 4,428,000us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue 2,059,000us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue 7,472,000us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue  
Barter transaction cost 4,030,000us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts 4,058,000us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts 6,650,000us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts  
Business tax and surcharge on barter transactions 266,000xnet_BusinessTaxAndSurcharges 124,000xnet_BusinessTaxAndSurcharges 426,000xnet_BusinessTaxAndSurcharges  
Net gains from barter transactions 1,556,000xnet_AdvertisingBarterTransactionsAdvertisingBarterNetGains 1,020,000xnet_AdvertisingBarterTransactionsAdvertisingBarterNetGains 4,666,000xnet_AdvertisingBarterTransactionsAdvertisingBarterNetGains  
External advertising and market promotion expenses 13,957,000us-gaap_MarketingAndAdvertisingExpense 12,247,000us-gaap_MarketingAndAdvertisingExpense 7,951,000us-gaap_MarketingAndAdvertisingExpense  
Capitalization of software development costs           
Interest and penalties net of tax recognized 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense  
Value added tax on revenues 17.00%xnet_ValueAddedTaxRate      
Value added tax on sub-licensing revenues 6.00%xnet_ValueAddedTaxInCertainServiceRevenues      
Employee benefits cost 3,818,000us-gaap_DefinedBenefitPlanServiceCost 3,243,000us-gaap_DefinedBenefitPlanServiceCost 1,930,000us-gaap_DefinedBenefitPlanServiceCost  
Statutory general reserve rate 10.00%xnet_StatutoryGeneralReserveRatePercentageOnNetIncome      
Statutory general reserve rate of registered capital 50.00%xnet_StatutoryGeneralReserveFundAsPercentageOfRegisteredCapital      
Dividends declared $ 0us-gaap_CommonStockDividendsPerShareDeclared $ 0us-gaap_CommonStockDividendsPerShareDeclared $ 0us-gaap_CommonStockDividendsPerShareDeclared  
Minimum [Member]        
Accounting Policies and General Information [Line Items]        
Amortization percentage of intangible assets 70.00%xnet_PercentageOfAmortizedCost
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Income tax examination higher limit 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Maximum [Member]        
Accounting Policies and General Information [Line Items]        
Amortization percentage of intangible assets 90.00%xnet_PercentageOfAmortizedCost
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Income tax examination higher limit 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Content Copyrights [Member]        
Accounting Policies and General Information [Line Items]        
Impairment of intangible assets 0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CopyrightsMember		 0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CopyrightsMember		 0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CopyrightsMember		  
Online game licenses [Member]        
Accounting Policies and General Information [Line Items]        
Other intangible assets, amortization period 3 years      
Impairment of intangible assets $ 808,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= xnet_OnlineGameLicensesMember		 $ 808,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= xnet_OnlineGameLicensesMember		     
Acquired computer software [Member]        
Accounting Policies and General Information [Line Items]        
Other intangible assets, amortization period 5 years      
Internal use software development costs [Member]        
Accounting Policies and General Information [Line Items]        
Other intangible assets, amortization period 5 years      
Domain name [Member]        
Accounting Policies and General Information [Line Items]        
Other intangible assets, amortization period 5 years      
Land use right [Member]        
Accounting Policies and General Information [Line Items]        
Other intangible assets, amortization period 30 years