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Taxation - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended		1 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 14, 2008	Mar. 16, 2007	Feb. 28, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Income Tax [Line Items]
Effective income tax rate	10.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	10.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	12.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Research and development expense percentage	150.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Preferential tax rate		10.00%xnet_PreferentialEnterpriseIncomeTaxRate
Undistributed earnings of foreign subsidiaries	$ 38,393,000us-gaap_UndistributedEarningsOfForeignSubsidiaries	$ 31,385,000us-gaap_UndistributedEarningsOfForeignSubsidiaries
Foreign withholding taxes	3,839,000xnet_IncomeTaxReconciliationForeignWithholdingTaxes	3,138,000xnet_IncomeTaxReconciliationForeignWithholdingTaxes
PRC Enterprise [Member]
Income Tax [Line Items]
Effective income tax rate	25.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = xnet_PeoplesRepublicOfChinaEntitiesMember
Accrued income tax	$ 0us-gaap_AccruedIncomeTaxes / dei_LegalEntityAxis = xnet_PeoplesRepublicOfChinaEntitiesMember
Shenzhen Xunlei [Member]
Income Tax [Line Items]
Income tax holiday description	Shenzhen Xunlei has been claiming such Super Deduction in ascertaining its tax assessable profits from 2009 onwards. In addition, approved by the relevant local tax authority in July 2010, Shenzhen Xunlei was recognized as an enterprise engaged in software development activities, accordingly, it is entitled to a tax holiday of 2-year Exemption and 3-year 50% Reduction from 2010 onwards.
New Enterprise Income Tax Rate [Member]
Income Tax [Line Items]
Effective income tax rate					25.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = xnet_NewEnterpriseIncomeTaxRateMember
Income tax transitional period					5 years
Favorable statutory tax rate				15.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = xnet_NewEnterpriseIncomeTaxRateMember
New Enterprise Income Tax Rate [Member] | Subsidiaries And VIE's Subsidiaries [Member]
Income Tax [Line Items]
Effective income tax rate	25.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = xnet_NewEnterpriseIncomeTaxRateMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
High and New Technology Enterprise [Member]
Income Tax [Line Items]
Certificate effective date						Jan. 01, 2011
Enterprise Income Tax Rate [Member]
Income Tax [Line Items]
Effective income tax rate	15.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = xnet_EnterpriseIncomeTaxRateMember
Income tax holiday description	As approved by the local tax authority, Giganology Shenzhen was further exempt from EIT for two years commencing from its first year of profitable operation after offsetting prior years’ tax losses, followed by a 50% reduction for the next three years (“2-year Exemption and 3-year 50% Reduction”) as a software enterprise. The first year of profit operation of Giganology Shenzhen was 2006. According to new EIT Law, Giganology Shenzhen could still enjoy the tax holidays which were grandfathered by the New EIT Law.
Shenzhen Special Economic Zone [Member]
Income Tax [Line Items]
Transitional income tax rates			25.00%xnet_TransitionalIncomeTaxRates / us-gaap_IncomeTaxAuthorityAxis = xnet_ShenzhenSpecialEconomicZoneMember				24.00%xnet_TransitionalIncomeTaxRates / us-gaap_IncomeTaxAuthorityAxis = xnet_ShenzhenSpecialEconomicZoneMember	22.00%xnet_TransitionalIncomeTaxRates / us-gaap_IncomeTaxAuthorityAxis = xnet_ShenzhenSpecialEconomicZoneMember	20.00%xnet_TransitionalIncomeTaxRates / us-gaap_IncomeTaxAuthorityAxis = xnet_ShenzhenSpecialEconomicZoneMember	18.00%xnet_TransitionalIncomeTaxRates / us-gaap_IncomeTaxAuthorityAxis = xnet_ShenzhenSpecialEconomicZoneMember
Giganology (Shenzhen) Co. Ltd [Member]
Income Tax [Line Items]
Effective income tax rate	25.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = xnet_GiganologyShenzhenCoLtdMember	25.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = xnet_GiganologyShenzhenCoLtdMember	25.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = xnet_GiganologyShenzhenCoLtdMember

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