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Staff cost - Summary of Staff Costs (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2022 CNY (¥)
Profit or loss [abstract]
Wages and salaries	¥ 1,355,281	$ 188,921	¥ 1,217,414	¥ 944,850
Contribution to defined contribution plans	317,790	44,299	354,014	371,458
Cost of share-based payment	7,829	1,091	0	0
Staff severance cost	3,411	475	35,547	19,531
Other employee benefits	86,314	12,032	78,269	83,081
Staff costs	¥ 1,770,625	$ 246,818	¥ 1,685,244	¥ 1,418,920

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- Definition

Staff severance costs.

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- Definition

The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment.

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- Definition

The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]

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- Definition

The amount of long-term employee benefits other than post-employment benefits and termination benefits. Such benefits may include long-term paid absences, jubilee or other long-service benefits, long-term disability benefits, long-term profit-sharing and bonuses and long-term deferred remuneration. [Refer: Employee benefits expense]

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- Definition

The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

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- Definition

A class of employee benefits expense that represents wages and salaries. [Refer: Employee benefits expense]

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