Income Taxes - Schedule of Movement of Valuation Allowance (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Movement of valuation allowance
Balance at the beginning of the year	¥ 1,246,296	$ 191,002	¥ 1,207,426	¥ 1,198,872
Additions	396,582	60,780	143,227	128,464
Written-off for expiration of net operating losses	(304,939)	(46,734)	(98,818)	(10,584)
Utilization of previously unrecognized tax losses and deductible advertising expenses	(5,218)	(800)	(5,539)	(109,326)
Balance at the end of the year	¥ 1,332,721	$ 204,248	¥ 1,246,296	¥ 1,207,426

Amount of deferred tax assets additions for which it is more likely than not that a tax benefit will not be realized.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Amount of decrease in the valuation allowance for a Write off for expiration of net operating losses.

+ References

No definition available.

+ Details

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Namespace Prefix:	tour_
Data Type:	xbrli:monetaryItemType
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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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Period Type:	duration