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Related Party Transactions - Schedule of Relationship Between Related Parties with their Groups (Detail)	12 Months Ended
	Dec. 31, 2017
Zhuhai Qianyou [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Equity investment of the Group
Hao Cheng [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Co-founder and shareholder of the Group
Chuan Wang [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Director of the Company
Shenglong Zou [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Co-founder and shareholder of the Group
Beijing Millet Technology Co., Ltd. (“Beijing Xiaomi”) [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Company owned by a shareholder of the Group
Leading Advice Holdings Limited [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Company owned by a Co-founder and shareholder of the Group
Vantage Point Global Limited [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Shareholder of the Company
Aiden & Jasmine Limited [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Shareholder of the Company
Kingsoft Corporation Limited [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Shareholder of the Company
King Venture Holdings Limited [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Principal shareholder of the Group (shareholding >=10%)
Xiaomi Venture Limited [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Principal shareholder of the Group
Morningside Technology Investments Limited [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Shareholder of the Group
Shenzhen Mojingou Information Service Co., Ltd [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Equity investment of the Group
Shenzhen Xunlei Finance Information Service Co., Ltd. [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Subsidiary of the Group’s equity investment
Shenzhen Crystal Technology Co., Ltd. [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Company owned by a Co-founder and director of the Group
Millet Communication Technology Co., Ltd. (“Millet Communication Technology”) [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Company owned by a shareholder of the Group
Beijing Millet Electronic Products Co., Ltd. [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Company owned by a shareholder of the Group
Beijing Millet Digital Technology Co., Ltd. [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Company owned by a shareholder of the Group
Millet Technology Co., Ltd. [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Company owned by a shareholder of the Group
Shenzhen Thunder Trade Service Co., Ltd [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Subsidiary of the Group’s equity investment
Shenzhen Thunder Economic Consulting Co., Ltd [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Subsidiary of the Group’s equity investment
Shenzhen thunderbolt Digital Technology Co., Ltd [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Subsidiary of the Group’s equity investment
Beijing Millet Mobile Software Co., Ltd [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Company owned by a shareholder of the Group
Guangzhou Millet Information Service Co., Ltd [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Company owned by a shareholder of the Group
Shenzhen Xunyi Network Technology Corp., Ltd. Shenzhen Xunyi [Member]
Schedule of Other Related Party Transactions [Line Items]
Related parties relationship	Company operated by few former core members of Xunlei’s web game business

X

- Definition

This element represents a description of the nature of common ownership or management control relationships with other entities, regardless of there being transactions between the entities, when the existence of that control could result in operating results or financial position of the reporting entity significantly different from that which would have been obtained if the entities' were autonomous.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864

+ Details

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- Definition

Schedule of Other Related Party Transactions [Line Items]

+ References

No definition available.

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