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v3.8.0.1

Organization and nature of operations - Additional Information (Detail) ¥ / shares in Units, ¥ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2011 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) ¥ / shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |
Number of year's power of attorney retained |  | 10 years | 10 years |  |
Percentage of pre-tax operating profit |  | 80.00% | 80.00% |  |
Service fees payable | $ |  | $ 1,155,000 |  | $ 1,088,000 | $ 1,235,000
Exclusive Technology Support and Services Agreement [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of pre-tax operating profit |  | 20.00% | 20.00% |  |
Exclusive Technology Consulting and Training Agreement [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of pre-tax operating profit |  | 20.00% | 20.00% |  |
Software and Proprietary Technology License Contract [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of pre-tax operating profit |  | 40.00% | 40.00% |  |
Giganology (Shenzhen) Co. Ltd [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Termination of agreement, notice period |  | 30 days | 30 days |  |
Automated extended period of agreement |  | 10 years | 10 years |  |
Agreement expiration date |  | 2022 | 2022 |  |
Giganology (Shenzhen) Co. Ltd [Member] | Exclusive Technology Support and Services Agreement [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Term agreement expiration year |  | 2025 | 2025 |  |
Agreement between Giganology Shenzhen and Mr. Sean Shenglong Zou [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Additional interest-free loans |  |  | ¥ 20 |  |
Increase in registered capital |  |  | 30 |  |
Agreement between Giganology Shenzhen and Shareholders of Shenzhen Xunlei [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Interest-free loans |  |  | ¥ 9 |  |
Agreement between Giganology Shenzhen and Shenzhen Xunlei [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Increase in registered capital | ¥ 20 |  |  |  |
Term agreement expiration year |  | 2016 | 2016 |  |
Call Option Agreement [Member] | Giganology (Shenzhen) Co. Ltd [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Agreement expiration date |  | 2022 | 2022 |  |
Outstanding share, purchase price per share | ¥ / shares |  |  | ¥ 1 |  |

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