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Leases - Operating lease right-of-use assets and the amortization (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2023 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 CNY (¥)	Jan. 01, 2022 CNY (¥)
Lessee Disclosure [Abstract]
Operating lease right-of-use assets	¥ 172,643		¥ 141,627
Less: accumulated amortization	(47,438)		(41,975)
Total	¥ 125,205	$ 17,635	¥ 99,652	¥ 95,108

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