SEGMENT REPORTING - Total long-lived assets excluding financial instruments, intangible assets, long-term investment and goodwill by country (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	¥ 4,400,026	$ 602,801	¥ 4,132,784
PRC
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	¥ 4,400,026	$ 602,801	¥ 4,132,784

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-41

Name:	us-gaap_NoncurrentAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant