Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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- Definition

Represents the period of full exemption from income tax beginning with the entity's first profitable year granted under income tax law.

+ References

No definition available.

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- Definition

Income Tax [Line Items]

+ References

No definition available.

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- Definition

Represents the preferential statutory income tax rate applied to entities with certain qualified enterprise classification/status under the income tax law.

+ References

No definition available.

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- Definition

Represents the period following the full income tax exemption for which reduced preferential income tax rate is granted under income tax law.

+ References

No definition available.

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- Definition

Amount of tax deductible R&D expenses available in determining tax assessable profits for the year, as a percentage of research and development expenses incurred.

+ References

No definition available.

+ Details

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- Definition

Amount of withholding tax accrued or required to be accrued on dividends received from subsidiaries of the company.

+ References

No definition available.

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- Definition

Amount of withholding taxes imposed on dividends paid to shareholders.

+ References

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- Definition

Percent of withholding tax applied to foreign enterprises with no establishment or place in the PRC, but deriving dividends, interest, rents, royalties and other income (including capital gains) from sources in the PRC.

+ References

No definition available.

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Taxation - Additional Information (Detail) - USD ($)	12 Months Ended
Taxation - Additional Information (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Giganology Shenzhen and Xunlei Computer [Member]
Income Tax [Line Items]
Withholding taxes on dividends paid	$ 10
PRC Enterprise [Member]
Income Tax [Line Items]
Effective income tax rate	25.00%
High And New Technology Enterprises [Member] \| Shenzhen Xunlei, Onething, Wangwenhua and Xunlei Computer
Income Tax [Line Items]
Preferential tax rate (as a percent)	15.00%	15.00%	15.00%
State Administration of Taxation, China [Member] \| Research And Development Enterprise Activities [Member] \| Shenzhen Xunlei [Member]
Income Tax [Line Items]
Portion of research and development expenses incurred that are allowable as tax deductible expenses (as a percent)	175.00%
Domestic Tax Authority [Member]
Income Tax [Line Items]
Withholding tax rate on foreign enterprises	10.00%
Withholding tax accrued or required to be accrued	$ 0	$ 0	$ 0
Domestic Tax Authority [Member] \| High And New Technology Enterprises [Member] \| PRC Enterprise [Member]
Income Tax [Line Items]
Preferential tax rate (as a percent)	15.00%
Domestic Tax Authority [Member] \| Software Enterprise [Member] \| PRC Enterprise [Member]
Income Tax [Line Items]
Period of full exemption from income tax	2 years
Period of 50% reduction to income tax rate	3 years
Domestic Tax Authority [Member] \| National Key Software Enterprise [Member] \| PRC Enterprise [Member]
Income Tax [Line Items]
Preferential tax rate (as a percent)	10.00%
Foreign Tax Authority [Member] \| Cayman Islands Tax Information Authority [Member]
Income Tax [Line Items]
Withholding taxes on dividends paid	$ 0