Leases (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2025 CNY (¥)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2025 USD ($)
Leases
Land use rights with total carrying amount	¥ 320,298	¥ 541,071		$ 45,802
Options to terminate the leases (true or false)	true
Operating lease cost	¥ 168,626	249,169	¥ 344,606
Cash paid for amounts included in the measurement of operating lease liabilities	185,987	271,670	331,579
Change of right-of-use assets related to exchange for operating lease obligations	(52,897)	40,557	215,209
Short-term lease cost	¥ 15,700	¥ 44,600	¥ 42,300
Weighted average remaining lease term (in years)	2 years 9 months	2 years 10 months 13 days		2 years 9 months
Weighted average discount rate	3.54%	3.62%		3.54%
Equal to or more than
Leases
Remaining lease terms (in months or years)	1 month			1 month
Less than
Leases
Remaining lease terms (in months or years)	65 years			65 years
ASC 842 \| Cumulative effect of changes in accounting principles \| Land use rights
Leases
Land use rights with total carrying amount	¥ 4,000,000	¥ 4,200,000

Amount of increase/(decrease) in right-of-use asset related to exchange for operating lease liability.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Indicates (true false) whether lessee has option to terminate operating lease.

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Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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- Definition

Amount of lessee's right to use underlying asset under operating lease.

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- Definition

Weighted average discount rate for operating lease calculated at point in time.

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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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