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Basic and Diluted Net (Loss) / Income Per Share - Schedule of Basic and Diluted Net (Loss) / Income Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 2 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Numerator: |  |  |  |
Net (loss) / income attributable to Xunlei Limited |  | $ 10,812 us-gaap_NetIncomeLoss | $ 10,662 us-gaap_NetIncomeLoss | $ 503 us-gaap_NetIncomeLoss
Deemed dividend to certain shareholders from repurchase of shares |  | (14,926)xnet_DeemedDividendToShareholdersFromRepurchaseOfShares |  |
Acceleration of amortization of beneficial conversion feature |  | (49,346)xnet_AccelerationOfAmortizationOfBeneficialConversionOfInitialPublicOffering |  |
Deemed dividend to preferred shareholders upon initial public offering |  | (32,807)xnet_DeemedDividendToPreferredShareholdersUponInitialPublicOffering |  |
Allocation of net income to participating preferred shareholders |  |  | (4,094)us-gaap_PreferredStockDividendsAndOtherAdjustments |
Net (loss) / income attributable to Xunlei Limited's common shareholders |  | (105,366)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 2,268 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (313)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Dilutive effect of warrant |  |  | (1,531)xnet_AmountOfDilutiveSecuritiesWarrants |
Numerator for diluted (loss) / income per share |  | (105,366)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 737 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | (313)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator: |  |  |  |
Denominator for basic net (loss) / income per share-weighted average shares outstanding |  | 194,711,227 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 61,447,372 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 61,447,372 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of warrants |  |  | 2,218,935 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants |
Dilutive effect of share options and restricted shares |  |  | 12,399,591 xnet_IncrementalCommonSharesAttributableToStockOptionsAndRestrictedStockUnits |
Denominator for diluted net (loss) / income per share |  | 194,711,227 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 76,065,898 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 61,447,372 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net (loss) / income per share |  | $ (0.54)us-gaap_EarningsPerShareBasic | $ 0.04 us-gaap_EarningsPerShareBasic | $ (0.01)us-gaap_EarningsPerShareBasic
Diluted net (loss) / income per share |  | $ (0.54)us-gaap_EarningsPerShareDiluted | $ 0.01 us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted
Series C [Member] |  |  |  |
Numerator: |  |  |  |
Beneficial Conversion Feature of convertible preferred shares from their modifications |  |  |  | (286)xnet_BeneficialConversionFeatureOfConvertiblePreferredSharesModifications / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Deemed contribution |  |  |  | 2,979 xnet_DeemedContributionFromPreferredShareholders / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Series D Preferred Stock [Member] |  |  |  |
Numerator: |  |  |  |
Contingent beneficial conversion feature | 0 us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |
Deemed dividend to preferred shareholders |  | (279)xnet_DeemedDividendToPreferredShareholders / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |
Accretion to convertible redeemable preferred shares redemption value |  | (1,870)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | (4,300)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | (3,509)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember
Series C To One Series C [Member] |  |  |  |
Numerator: |  |  |  |
Contingent beneficial conversion feature |  | (57)us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature / us-gaap_StatementClassOfStockAxis = xnet_SeriescToOneSeriescPreferredStockMember |  |
Series E Preferred Shares [Member] |  |  |  |
Numerator: |  |  |  |
Accretion to convertible redeemable preferred shares redemption value |  | (12,754)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |
Amortization of beneficial conversion feature |  | (4,139)xnet_AmortizationOfBeneficialConversionFeature / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |
Acceleration of amortization of beneficial conversion feature |  | $ (49,346)xnet_AccelerationOfAmortizationOfBeneficialConversionOfInitialPublicOffering / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |

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- Definition Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Beneficial Conversion Feature -URI http://asc.fasb.org/extlink&oid=6505963 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 + Details
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- Definition Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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