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Principal Accounting Policies - Summary of total Revenue (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	¥ 4,259,128	$ 668,350	¥ 1,944,359	¥ 998,720
Online Recruitment Services To Enterprises Customers [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,219,026	662,057	1,927,178	986,859
Others [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	40,102	$ 6,293	17,181	11,861
Key Accounts Customer [Member] | Online Recruitment Services To Enterprises Customers [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	928,360		330,795	155,819
Mid Sized Accounts Customer [Member] | Online Recruitment Services To Enterprises Customers [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,513,506		696,325	363,282
Small Sized Accounts [Member] | Online Recruitment Services To Enterprises Customers [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	¥ 1,777,160		¥ 900,058	¥ 467,758

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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