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, 2015
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%
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%
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%
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%
Principal activities
Development of software for related companies (note a)
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%
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%
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%
Principal activities
Development of computer software and online games for
related companies and provision of advertising services
(note b)
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%
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%
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%
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%
Principal activities
Development of computer software and provision of
information technology services to related companies
Shenzhen Onething 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%
Principal activities
Development of computer software and provision of
information technology services to related companies
Wangxin Century Technologies (Beijing) Co., Ltd [Member]  
Variable Interest Entity [Line Items]  
Place of incorporation China
Date of incorporation Oct. 31, 2015
Relationship
VIE's subsidiary
Percentage of direct or indirect economic ownership 100.00%
Principal activities
Development of computer software and provision of
information technology services