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Taxation - Reconciliation of Total Tax (Benefit) Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax (benefit) / expense at PRC statutory rate (based on statutory tax rate applicable to enterprises in Shenzhen, China)	$ 2,129us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 2,433us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 655us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Effects of differences in tax rates in different jurisdictions applicable to entities of the Group outside of the PRC	(838)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	667us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	2,074us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Non-deductible expenses	714us-gaap_IncomeTaxReconciliationNondeductibleExpense	102us-gaap_IncomeTaxReconciliationNondeductibleExpense	53us-gaap_IncomeTaxReconciliationNondeductibleExpense
Effect of Super Deduction available to Shenzhen Xunlei	(1,365)us-gaap_IncomeTaxReconciliationDeductions	(1,763)us-gaap_IncomeTaxReconciliationDeductions	(2,274)us-gaap_IncomeTaxReconciliationDeductions
Effect of tax holiday	(2,784)us-gaap_IncomeTaxReconciliationTaxHolidays	(4,638)us-gaap_IncomeTaxReconciliationTaxHolidays	(2,073)us-gaap_IncomeTaxReconciliationTaxHolidays
Change in valuation allowance of deferred tax assets	291us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance		6us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effect on deferred tax assets due to change in tax rates	(103)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	1,764us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	(437)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Outside basis difference arising from VIE and its subsidiaries in the PRC	478xnet_IncomeTaxReconciliationChangeInOutsideBasisForeignSubsidiaries	713xnet_IncomeTaxReconciliationChangeInOutsideBasisForeignSubsidiaries	4,217xnet_IncomeTaxReconciliationChangeInOutsideBasisForeignSubsidiaries
Expiration of tax loss	51xnet_IncomeTaxReconciliationTaxCreditsExpirations	31xnet_IncomeTaxReconciliationTaxCreditsExpirations
Others	(32)us-gaap_IncomeTaxReconciliationOtherAdjustments	44us-gaap_IncomeTaxReconciliationOtherAdjustments	18us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense / (benefit)	$ (1,459)us-gaap_IncomeTaxExpenseBenefit	$ (647)us-gaap_IncomeTaxExpenseBenefit	$ 2,239us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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