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Organization and Nature of Operations - Accompanying Consolidated Financial Statements Include Financial Statements of Company, Subsidiaries, Variable Interest Entity ("VIE") and VIE's Subsidiaries (Detail)	12 Months Ended
	Dec. 31, 2014
Variable Interest Entity [Line Items]
Date of incorporation	Feb. 03, 2005
Shenzhen Xunlei Networking Technologies, Co., Ltd [Member]
Variable Interest Entity [Line Items]
Place of incorporation	China
Date of incorporation	Jan. 31, 2003
Relationship	VIE
Percentage of direct or indirect economic ownership	100.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = xnet_ShenzhenXunleiNetworkingTechnologiesCoLtdMember
Principal activities	Development of software, provision of online and related advertising, membership subscription and online game services; as well as sales of software licenses
Giganology (Shenzhen) Co. Ltd [Member]
Variable Interest Entity [Line Items]
Place of incorporation	China
Date of incorporation	Jun. 30, 2005
Relationship	Subsidiary
Percentage of direct or indirect economic ownership	100.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = xnet_GiganologyShenzhenCoLtdMember
Principal activities	Development of computer software and provision of information technology services to related companies
Shenzhen Fengdong Networking Technologies, Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Place of incorporation	China
Date of incorporation	Dec. 31, 2005
Relationship	VIE's subsidiary
Percentage of direct or indirect economic ownership	100.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = xnet_ShenzhenFengdongNetworkingTechnologiesCoLtdMember
Principal activities	Development of software for related companies
Shenzhen Xunlei Kankan Information Technologies Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Place of incorporation	China
Date of incorporation	Aug. 31, 2008
Relationship	VIE's subsidiary
Percentage of direct or indirect economic ownership	100.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = xnet_ShenzhenXunleiKankanInformationTechnologiesCoLtdMember
Principal activities	Development of software for related companies
Xunlei Software (Beijing) Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Place of incorporation	China
Date of incorporation	Jun. 30, 2009
Relationship	VIE's subsidiary
Percentage of direct or indirect economic ownership	100.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = xnet_XunleiSoftwareBeijingCoLtdMember
Principal activities	Development of software for related companies
Xunlei Software (Shenzhen) Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Place of incorporation	China
Date of incorporation	Jan. 31, 2010
Relationship	VIE's subsidiary
Percentage of direct or indirect economic ownership	100.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = xnet_XunleiSoftwareShenzhenCoLtdMember
Principal activities	Provision of software technology development for related companies
Xunlei Software (Nanjing) Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Place of incorporation	China
Date of incorporation	Jan. 31, 2010
Relationship	VIE's subsidiary
Percentage of direct or indirect economic ownership	100.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = xnet_XunleiSoftwareNanjingCoLtdMember
Principal activities	Development of computer software and online games for related companies and provision of advertising services (note a)
Xunlei Games Development (Shenzhen) Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Place of incorporation	China
Date of incorporation	Feb. 28, 2010
Relationship	VIE's subsidiary
Percentage of direct or indirect economic ownership	70.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = xnet_XunleiGamesDevelopmentShenzhenCoLtdMember
Principal activities	Development of online game and computer software for related companies and provision of advertising services
Xunlei Network Technologies Limited BVI [Member]
Variable Interest Entity [Line Items]
Place of incorporation	British Virgin Islands
Date of incorporation	Feb. 28, 2011
Relationship	Subsidiary
Percentage of direct or indirect economic ownership	100.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = xnet_XunleiNetworkTechnologiesLimitedBviMember
Principal activities	Holding company
Xunlei Network Technologies Limited HK [Member]
Variable Interest Entity [Line Items]
Place of incorporation	Hongkong
Date of incorporation	Mar. 31, 2011
Relationship	Subsidiary
Percentage of direct or indirect economic ownership	100.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = xnet_XunleiNetworkTechnologiesLimitedHkMember
Principal activities	Development computer software of related companies and provision of advertising services
Xunlei Computer (Shenzhen) Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Place of incorporation	China
Date of incorporation	Nov. 30, 2011
Relationship	Subsidiary
Percentage of direct or indirect economic ownership	100.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = xnet_XunleiComputerShenzhenCoLtdMember
Principal activities	Development of computer software and provision of information technology services to related companies
Shenzhen Wangxin Technologies Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Place of incorporation	China
Date of incorporation	Sep. 30, 2013
Relationship	VIE's subsidiary
Percentage of direct or indirect economic ownership	100.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = xnet_ShenzhenWangxinTechnologiesCoLtdMember
Principal activities	Development of computer software and provision of information technology services to related companies

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