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Inventories - Summary of Analysis of Inventory Reserve Accounts (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2022 CNY (¥)
Write-downs (reversals of write-downs) of inventories [abstract]
Inventories recognized as an expense in cost of sales	¥ 13,685,522	$ 1,907,709	¥ 13,444,277	¥ 11,991,899
Inventories written down	122,106	17,021	77,466	86,650
Reversal of write-down of inventories	¥ (63,338)	$ (8,829)	¥ (27,447)	¥ (31,765)

X

- Definition

The amount of inventories recognised as an expense during the period. [Refer: Inventories]

+ References

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- Definition

The amount of expense recognised related to the write-down of inventories to net realisable value. [Refer: Inventories]

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- Definition

The amount recognised as a reduction in the amount of inventories recognised as an expense due to the reversal of any write-down of inventories resulting from an increase in net realisable value. [Refer: Inventories; Inventory write-down]

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