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Leases - Operating lease right-of-use assets and the amortization (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥)
--- | --- | --- | ---
Lessee Disclosure [Abstract] |  |  |
Operating lease right-of-use assets | ¥ 188,844 |  | ¥ 172,643
Less: accumulated amortization | (56,194) |  | (47,438)
Total | ¥ 132,650 | $ 18,173 | ¥ 125,205

X
- Definition Amount of accumulated depreciation of right-of-use asset from operating lease. + References No definition available. + Details
Name: | exc_OperatingLeaseRightOfUseAssetAccumulatedDepreciation
Namespace Prefix: | exc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before accumulated depreciation, of right-of-use asset from operating lease. + References No definition available. + Details
Name: | exc_OperatingLeaseRightOfUseAssetBeforeAccumulatedDepreciation
Namespace Prefix: | exc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LesseeDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant