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GOODWILL - Carrying amount (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2022 CNY (¥)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	¥ 575,427	$ 78,833	¥ 575,427
Addition	0	0	0
Disposal	(3,211)	(440)
Impairment	0	0	0	¥ 0
Goodwill, Ending Balance	¥ 572,216	$ 78,393	¥ 575,427	¥ 575,427

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- Definition

Amount of disposal of goodwill during period.

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- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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