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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 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. + References No definition available. + Details
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