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Additional information: condensed financial statements of the Company - Schedule of Condensed Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net cash generated from / (used in) operating activities	$ 48,202us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	$ 85,533us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	$ 59,914us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities
Net cash used in investing activities	(70,546)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	(78,352)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	(49,490)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities
Net cash generated from / (used in) financing activities	333,268us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	2,487us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	17,692us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net (decrease) / increase in cash and cash equivalents	310,924us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	9,668us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	28,116us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year	93,906us-gaap_CashAndCashEquivalentsAtCarryingValue	81,906us-gaap_CashAndCashEquivalentsAtCarryingValue	53,349us-gaap_CashAndCashEquivalentsAtCarryingValue
Effect of exchange rates on cash and cash equivalents	(555)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations	2,332us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations	441us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
Cash and cash equivalents at end of year	404,275us-gaap_CashAndCashEquivalentsAtCarryingValue	93,906us-gaap_CashAndCashEquivalentsAtCarryingValue	81,906us-gaap_CashAndCashEquivalentsAtCarryingValue
Xunlei Limited [Member]
Cash flows from operating activities
Net cash generated from / (used in) operating activities	(41,485)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	4,708us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	695us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from investing activities
Net cash used in investing activities	(10,333)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(3,843)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(37,302)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from financing activities
Net cash generated from / (used in) financing activities	332,412us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(2,242)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	35,488us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net (decrease) / increase in cash and cash equivalents	280,594us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(1,377)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(1,119)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at beginning of year	28,863us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	30,240us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	31,359us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Effect of exchange rates on cash and cash equivalents	0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at end of year	$ 309,457us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 28,863us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 30,240us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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