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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
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash flows from operating activities |  |  |
Net cash generated from / (used in) operating activities | $ 48,202 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | $ 85,533 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | $ 59,914 us-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 | 333,268 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 2,487 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 17,692 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net (decrease) / increase in cash and cash equivalents | 310,924 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 9,668 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 28,116 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year | 93,906 us-gaap_CashAndCashEquivalentsAtCarryingValue | 81,906 us-gaap_CashAndCashEquivalentsAtCarryingValue | 53,349 us-gaap_CashAndCashEquivalentsAtCarryingValue
Effect of exchange rates on cash and cash equivalents | (555)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations | 2,332 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations | 441 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
Cash and cash equivalents at end of year | 404,275 us-gaap_CashAndCashEquivalentsAtCarryingValue | 93,906 us-gaap_CashAndCashEquivalentsAtCarryingValue | 81,906 us-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 | 4,708 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 695 us-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 | 332,412 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,242)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 35,488 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net (decrease) / increase in cash and cash equivalents | 280,594 us-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 | 28,863 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 30,240 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 31,359 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Effect of exchange rates on cash and cash equivalents | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at end of year | $ 309,457 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 28,863 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 30,240 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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