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Convertible Redeemable Preferred Shares - Summary of convertible redeemable preferred share (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 CNY (¥) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 CNY (¥) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2019 USD ($) shares
Series A Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Balance Beginning | ¥ 36,177 |  | ¥ 33,434 |  | ¥ 30,144 |
Balance Beginning, Shares | shares | 60,000,000 | 60,000,000 | 60,000,000 | 60,000,000 | 60,000,000 | 60,000,000
Accretion on convertible redeemable preferred shares to redemption value | ¥ 1,057 |  | ¥ 2,743 |  | ¥ 3,290 |
Conversion of preferred shares to ordinary shares | ¥ (37,234) |  |  |  |  |
Conversion of preferred shares to ordinary shares, Shares | shares | (60,000,000) | (60,000,000) |  |  |  |
Balance Ending, Shares | shares | 0 | 0 | 60,000,000 | 60,000,000 | 60,000,000 | 60,000,000
Balance Ending | ¥ 0 |  | ¥ 36,177 |  | ¥ 33,434 |
Series B Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Balance Beginning | ¥ 67,976 |  | ¥ 62,785 |  | ¥ 56,554 |
Balance Beginning, Shares | shares | 40,000,000 | 40,000,000 | 40,000,000 | 40,000,000 | 40,000,000 | 40,000,000
Accretion on convertible redeemable preferred shares to redemption value | ¥ 2,006 |  | ¥ 5,191 |  | ¥ 6,231 |
Conversion of preferred shares to ordinary shares | ¥ (69,982) |  |  |  |  |
Conversion of preferred shares to ordinary shares, Shares | shares | (40,000,000) | (40,000,000) |  |  |  |
Balance Ending, Shares | shares | 0 | 0 | 40,000,000 | 40,000,000 | 40,000,000 | 40,000,000
Balance Ending | ¥ 0 |  | ¥ 67,976 |  | ¥ 62,785 |
Series C Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Balance Beginning | ¥ 478,565 |  | ¥ 443,367 |  | ¥ 400,950 |
Balance Beginning, Shares | shares | 147,068,133 | 147,068,133 | 147,068,133 | 147,068,133 | 147,068,133 | 147,068,133
Accretion on convertible redeemable preferred shares to redemption value | ¥ 13,580 |  | ¥ 35,198 |  | ¥ 42,417 |
Conversion of preferred shares to ordinary shares | ¥ (492,145) |  |  |  |  |
Conversion of preferred shares to ordinary shares, Shares | shares | (147,068,133) | (147,068,133) |  |  |  |
Balance Ending, Shares | shares | 0 | 0 | 147,068,133 | 147,068,133 | 147,068,133 | 147,068,133
Balance Ending | ¥ 0 |  | ¥ 478,565 |  | ¥ 443,367 |
Series D Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Balance Beginning | ¥ 380,782 |  | ¥ 352,586 |  | ¥ 317,533 |
Balance Beginning, Shares | shares | 60,856,049 | 60,856,049 | 60,856,049 | 60,856,049 | 60,856,049 | 60,856,049
Accretion on convertible redeemable preferred shares to redemption value | ¥ 10,823 |  | ¥ 28,196 |  | ¥ 35,053 |
Conversion of preferred shares to ordinary shares | ¥ (391,605) |  |  |  |  |
Conversion of preferred shares to ordinary shares, Shares | shares | (60,856,049) | (60,856,049) |  |  |  |
Balance Ending, Shares | shares | 0 | 0 | 60,856,049 | 60,856,049 | 60,856,049 | 60,856,049
Balance Ending | ¥ 0 |  | ¥ 380,782 |  | ¥ 352,586 |
Series E Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Balance Beginning | ¥ 1,845,033 |  | ¥ 1,711,329 |  | ¥ 874,107 |
Balance Beginning, Shares | shares | 144,073,367 | 144,073,367 | 144,073,367 | 144,073,367 | 83,474,263 | 83,474,263
Issuance of Series |  |  |  |  | ¥ 691,894 |
Issuance of Series, Shares | shares |  |  |  |  | 60,599,104 | 60,599,104
Accretion on convertible redeemable preferred shares to redemption value | ¥ 51,072 |  | ¥ 133,704 |  | ¥ 145,328 |
Conversion of preferred shares to ordinary shares | ¥ (1,896,105) |  |  |  |  |
Conversion of preferred shares to ordinary shares, Shares | shares | (144,073,367) | (144,073,367) |  |  |  |
Balance Ending, Shares | shares | 0 | 0 | 144,073,367 | 144,073,367 | 144,073,367 | 144,073,367
Balance Ending | ¥ 0 |  | ¥ 1,845,033 |  | ¥ 1,711,329 |
Series F Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Balance Beginning | ¥ 2,882,063 |  |  |  |  |
Balance Beginning, Shares | shares | 99,354,585 | 99,354,585 |  |  |  |
Issuance of Series |  |  | ¥ 2,803,114 |  |  |
Issuance of Series, Shares | shares |  |  | 99,354,585 | 99,354,585 |  |
Accretion on convertible redeemable preferred shares to redemption value | ¥ 85,527 |  | ¥ 78,949 |  |  |
Conversion of preferred shares to ordinary shares | ¥ (2,967,590) |  |  |  |  |
Conversion of preferred shares to ordinary shares, Shares | shares | (99,354,585) | (99,354,585) |  |  |  |
Balance Ending, Shares | shares | 0 | 0 | 99,354,585 | 99,354,585 |  |
Balance Ending | ¥ 0 |  | ¥ 2,882,063 |  |  |
Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Balance Beginning | ¥ 5,690,596 |  | ¥ 2,603,501 |  | ¥ 1,679,288 |
Balance Beginning, Shares | shares | 551,352,134 | 551,352,134 | 451,997,549 | 451,997,549 | 391,398,445 | 391,398,445
Issuance of Series |  |  | ¥ 2,803,114 |  | ¥ 691,894 |
Issuance of Series, Shares | shares |  |  | 99,354,585 | 99,354,585 | 60,599,104 | 60,599,104
Accretion on convertible redeemable preferred shares to redemption value | ¥ 164,065 | $ 25,284 | ¥ 283,981 | $ 41,546 | ¥ 232,319 | $ 33,529
Conversion of preferred shares to ordinary shares | ¥ (5,854,661) |  |  |  |  |
Conversion of preferred shares to ordinary shares, Shares | shares | (551,352,134) | (551,352,134) |  |  |  |
Balance Ending, Shares | shares | 0 | 0 | 551,352,134 | 551,352,134 | 451,997,549 | 451,997,549
Balance Ending | ¥ 0 |  | ¥ 5,690,596 |  | ¥ 2,603,501 |

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