Accounts and notes payable - Additional Information (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Accounts and notes payable
Cash pledged as collateral	$ 36.2	$ 44.1
Notes receivable pledged as collateral	$ 4.2	$ 2.2

Amount of notes receivable pledged as collateral for notes payable.

No definition available.

Name:	caas_NotesReceivablePledgedAsCollateralForNotesPayable
Namespace Prefix:	caas_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant