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Certain Risks and Concentration - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Customer | Dec. 31, 2013 Customer | Dec. 31, 2012 Customer
Concentration Risk [Line Items] |  |  |
Maximum foreign ownership in internet information provider or other value-added telecommunication service provider's business allowed under PRC laws and regulations | 50.00%xnet_ForeignOwnershipPercentageInInternetBasedBusinessesMaximum |  |
Retained earnings and distributable reserves | $ 574 us-gaap_RetainedEarningsAccumulatedDeficit | $ 7,037 us-gaap_RetainedEarningsAccumulatedDeficit |
Number of top customers accounted for net revenues | 10 xnet_ConcentrationRiskNumberOfTopCustomers | 10 xnet_ConcentrationRiskNumberOfTopCustomers | 10 xnet_ConcentrationRiskNumberOfTopCustomers
Sales Revenue, Net [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of net revenues accounted from customers | 16.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SalesRevenueNetMember | 14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SalesRevenueNetMember | 20.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SalesRevenueNetMember
Shenzhen Xunlei Networking Technologies, Co., Ltd [Member] |  |  |
Concentration Risk [Line Items] |  |  |
operating contract term | 10 years |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Retained earnings and distributable reserves | 34,210 us-gaap_RetainedEarningsAccumulatedDeficit / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Retained earnings and distributable reserves |  | $ 32,296 us-gaap_RetainedEarningsAccumulatedDeficit / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Concentration Risk Number Of Top Customers + References No definition available. + Details
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- Definition Foreign Ownership Percentage In Internet Based Businesses Maximum + References No definition available. + Details
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