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Investment in Joint Ventures - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
Disclosure of joint ventures [line items] |  |  |  |  |  |
Share of capital commitment | ¥ 5,700 | ¥ 3,500 | $ 800 |  |  |
Cash and cash equivalents | 5,544,376 | 4,451,489 | 780,502 | $ 626,653 | ¥ 4,788,219 | ¥ 5,877,647
Impairement Loss | 0 |  |  |  |  |
Other operating expenses [member] |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Impairement Loss |  | 1,000 |  |  |  |
People's Republic of China [member] |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Cash and cash equivalents | 278,500 | 163,000 | 39,200 |  |  |
Y & C Engine Co., Ltd. [member] |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Cash and cash equivalents | 64,252 | 97,741 |  |  |  |
Y & C Engine Co., Ltd. [member] | Outstanding bills receivables discounted with banks [member] |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Share of outstanding bills receivables | 11,800 | 5,900 | 1,700 |  |  |
Y & C Engine Co., Ltd. [member] | Outstanding bills receivables endorsed to suppliers [member] |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Share of outstanding bills receivables | 8,800 | 39,700 | 1,200 |  |  |
Joint ventures [member] |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Cash and cash equivalents | 604,281 | 416,292 | 85,067 |  |  |
Share of restricted cash | 22,300 | 40,500 | 3,100 |  |  |
Bills receivables | ¥ 2,300 | ¥ 2,300 | $ 300 |  |  |

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