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Certain Risks and Concentration - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	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	$ 574us-gaap_RetainedEarningsAccumulatedDeficit	$ 7,037us-gaap_RetainedEarningsAccumulatedDeficit
Number of top customers accounted for net revenues	10xnet_ConcentrationRiskNumberOfTopCustomers	10xnet_ConcentrationRiskNumberOfTopCustomers	10xnet_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	34,210us-gaap_RetainedEarningsAccumulatedDeficit / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Variable Interest Entity, Not Primary Beneficiary [Member]
Concentration Risk [Line Items]
Retained earnings and distributable reserves		$ 32,296us-gaap_RetainedEarningsAccumulatedDeficit / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember

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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)

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-Name Accounting Standards Codification

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611



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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.

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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

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-Name Accounting Standards Codification

-Topic 210

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Concentration Risk Number Of Top Customers

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Foreign Ownership Percentage In Internet Based Businesses Maximum

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