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Long-term pre-tax operating income as a percentage of net sales, used as an input to measure fair value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of fees from providing shareholder services, including, but not limited to, answering shareholder inquiries and providing shareholders with information about their investments.

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Price of a single share of a number of saleable stocks of a company.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The addition amount of loan with zero interest rates.

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States the notice requirement (for example, 30 to 60 days) is required to terminate its agreement.

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The increase (decrease) of registered capital.

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Amount of loan with zero interest rates.

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How many years each power of attorney will remain in force.

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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