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Treasury shares - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 CNY (¥) shares | Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 CNY (¥) shares | Dec. 31, 2022 CNY (¥)
Disclosure of Treasury Shares [line items] |  |  |  |
Purchased of ordinary shares | 3,339,968 | 3,339,968 | 0 |
Purchase of treasury shares | ¥ 285,600,000 | $ 39,800 | ¥ 0 | ¥ 0

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- Definition Disclosure of treasury shares. + References No definition available. + Details
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Namespace Prefix: | ck0000932695_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Ordinary shares purchased. + References No definition available. + Details
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Namespace Prefix: | ck0000932695_
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Balance Type: | na
Period Type: | duration

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- Definition The cash outflow to reacquire common stock during the period. + References No definition available. + Details
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Namespace Prefix: | ck0000932695_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration