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Ordinary Shares - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 CNY (¥) shares | Dec. 31, 2021 USD ($) shares | Nov. 18, 2021 USD ($) | Dec. 31, 2020 shares | Dec. 31, 2019 shares | Dec. 31, 2018 shares
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of ordinary shares outstanding | [1] | 505,183,788 | 505,183,788 |  | 479,219,628 | 475,706,748 | 472,225,380
Ordinary shares, shares issued |  | 505,183,788 | 505,183,788 |  | 479,219,628 |  |
Stock repurchased during period value | ¥ |  | ¥ 31,204 |  |  |  |  |
Class A Ordinary Shares [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock repurchased during period shares |  | 664,268 | 664,268 |  |  |  |
Stock repurchased during period value |  | ¥ 31,204 | $ 4,897 |  |  |  |
American Depositary Shares [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock repurchased during period shares |  | 166,067 | 166,067 |  |  |  |
American Depositary Shares [Member] | Share Repurchase Program [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Amount of stock repurchase plan authorized | $ |  |  |  | $ 200,000 |  |  |
[1] | Par value per share and the number of shares have been retrospectively adjusted for the Share Subdivision and the ADS Ratio Change that were effective on February 5, 2021 as detailed in Note 2(a) and Note 22.

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