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Share-Based Compensation - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended |
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Dec. 31, 2021 CNY (¥) Customer shares | Dec. 31, 2021 USD ($) Customer $ / shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2020 CNY (¥) Customer shares | Dec. 31, 2019 $ / shares | Dec. 31, 2019 CNY (¥) | Dec. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Closing stock price | $ / shares |  |  |  |  |  |  | $ 29.48
Aggregate intrinsic value of options exercised | ¥ 27,950 | $ 4,386 |  | ¥ 170,374 |  | ¥ 178,577 |
Weighted average fair value per option granted | $ / shares |  | $ 23.00 | $ 40.52 |  | $ 45.26 |  |
The total grant date fair value of options vested | 32,226 | $ 5,057 |  | ¥ 58,092 |  | 79,197 |
Aggregate fair value of outstanding options at the grant date | ¥ 89,242 |  |  |  |  |  | $ 14,004
No of ordinary shares per Ads before division | Customer | 1 | 1 |  | 1 |  |  |
No of ordinary shares per Ads after division | Customer | 4 | 4 |  |  |  |  |
Unrecognized share-based compensation expenses | ¥ 48,884 |  |  |  |  |  | $ 7,671
Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted average fair value per option granted | $ / shares |  | $ 60.83 | $ 44.69 |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unvested options/restricted shares expected to be recognized over a weighted-average period | 3 years 3 months 3 days | 3 years 3 months 3 days |  |  |  |  |
Stock Options [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period | For share options and restricted shares with service condition or performance condition granted under the Plans, majority are subject to vesting schedules of approximately four years with 25% of the awards vesting each year and have a contractual term of ten years. | For share options and restricted shares with service condition or performance condition granted under the Plans, majority are subject to vesting schedules of approximately four years with 25% of the awards vesting each year and have a contractual term of ten years. |  |  |  |  |
Stock Options [Member] | 2011 Plan [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share based awards grant to employees, directors and consultants to purchase aggregate ordinary shares | shares | 31,372,400 |  | 7,843,100 | 7,843,100 |  |  | 31,372,400
Stock Options [Member] | 2013 Plan [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share based awards grant to employees, directors and consultants to purchase aggregate ordinary shares | shares | 13,400,000 |  | 3,350,000 | 3,350,000 |  |  | 13,400,000
Stock Options [Member] | 2016 Plan [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share based awards grant to employees, directors and consultants to purchase aggregate ordinary shares | shares | 19,560,000 |  | 4,890,000 | 4,890,000 |  |  | 19,560,000
Stock Options [Member] | 2016 Plan II [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share based awards grant to employees, directors and consultants to purchase aggregate ordinary shares | shares | 12,000,000 |  | 3,000,000 | 3,000,000 |  |  | 12,000,000
Options and Restricted Shares [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period | 4 years | 4 years |  |  |  |  |
Original contractual term | 10 years | 10 years |  |  |  |  |
Options and Restricted Shares [Member] | Maximum [Member] | Awards Vesting Percentage Each Year [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of awards vesting | 25.00% | 25.00% |  |  |  |  |
Restricted Shares [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unvested options/restricted shares expected to be recognized over a weighted-average period | 2 years 9 months 29 days | 2 years 9 months 29 days |  |  |  |  |
Aggregate fair value of the outstanding restricted shares | ¥ 454,972 | $ 71,395 |  |  |  |  |
Unrecognized compensation expense | 262,589 |  |  |  |  |  | $ 41,206
Weighted average grant date fair value, Granted | $ / shares |  | $ 50.79 | $ 85.44 |  | $ 85.30 |  |
Grant date fair value of restricted shares vested | ¥ 165,675 | $ 25,998 |  | ¥ 144,757 |  | ¥ 141,227 |

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