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Taxation - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
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 |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References 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 + Details
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