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Principal Accounting Policies - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2021 USD ($) | Jan. 01, 2019 CNY (¥)
Details Of Significant Accounting Policies [Line Items] |  |  |  |  |
Rate of translations of amounts from RMB into US$ | 6.3726 |  |  | 6.3726 |
Allowance for doubtful accounts receivable | ¥ 0 | ¥ 0 | ¥ 0 |  |
Impairment of long-lived assets | 0 | 0 | 0 |  |
Employee benefit expenses incurred | 256,533 | 135,478 | 103,817 |  |
Operating lease right of use asset | 309,085 | 144,063 |  | $ 48,502 | ¥ 50,570
Operating lease liability | 310,896 | 135,932 |  |  | ¥ 50,089
Unrecognized tax benefits | 0 | 0 |  |  |
Appropriations to statutory reserves | ¥ 0 | 0 | 0 |  |
Foreign Invested Enterprise [Member] | General Reserve Fund [Member] | China [Member] |  |  |  |  |
Details Of Significant Accounting Policies [Line Items] |  |  |  |  |
Minimum percentage appropriation to general reserve fund required | 10.00% |  |  |  |
Required general reserve registered capital ratio to deforce compulsory net profit allocation to general reserve | 50.00% |  |  |  |
Domestic Enterprise [Member] | Statutory Surplus Reserve [Member] | China [Member] |  |  |  |  |
Details Of Significant Accounting Policies [Line Items] |  |  |  |  |
Minimum percentage appropriation to statutory surplus fund required | 10.00% |  |  |  |
Required statutory surplus registered capital ratio to deforce compulsory net profit allocation to statutory surplus | 50.00% |  |  |  |
Key Accounts Customer [Member] |  |  |  |  |
Details Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue judgment description | revenue of RMB50 or more annually as key accounts |  |  |  |
Mid Sized Accounts Customer [Member] |  |  |  |  |
Details Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue judgment description | revenue between RMB5 and RMB50 annually as mid-sized accounts |  |  |  |
Small Sized Accounts [Member] |  |  |  |  |
Details Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue judgment description | revenue of RMB5 or less annually as small-sized accounts |  |  |  |
Transferred over Time | Online Recruitment Services To Enterprises Customers [Member] |  |  |  |  |
Details Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred revenue, revenue recognized | ¥ 3,043,692 | 1,527,671 | 717,721 |  |
Transferred at Point in Time | Online Recruitment Services To Enterprises Customers [Member] |  |  |  |  |
Details Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred revenue, revenue recognized | ¥ 1,175,334 | ¥ 399,507 | ¥ 269,138 |  |

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