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Fair Value Measurements - Additional Information (Detail) ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)	Mar. 30, 2021 shares	Apr. 30, 2020 shares
Gain loss on derivative instruments	¥ 44.5	$ 7.0	¥ 11.5
Transfer of financial assets or liabilities	0.0		0.0
Warrants outstanding	0.0
Fair Value, Nonrecurring [Member]
Assets, fair value disclosure	0.0		0.0
Fair Value, Recurring [Member]
Liabilities, fair value disclosure	0.0
Financial Assets [Member]
Transfer of financial assets or liabilities	¥ 0.0		¥ 0.0
Series B41 Redeemable Convertible Preferred Shares [Member] | Eat Together Warrant [Member]
Class of warrants or rights number of securities | shares					6,664,000
Series B4 Redeemable Convertible Preferred Shares [Member] | Eat Together Warrant [Member]
Class of warrants or rights number of securities | shares				6,989,750

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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