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Investment in Joint Ventures - Additional Information (Detail) | 12 Months Ended |  |  |  |
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Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
Disclosure of joint ventures [line items] |  |  |  |  |  |
Share of capital commitment | ¥ 9,100,000 | ¥ 5,700,000 | $ 1,300,000 |  |  |
Cash and cash equivalents | 5,915,916,000 | 5,544,376,000 | 824,656,000 | $ 772,865,000 | ¥ 4,451,489,000 | ¥ 4,788,219,000
Impairment loss | 0 | 0 |  |  |  |
People's Republic of China [member] |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Cash and cash equivalents | 331,500,000 | 278,500,000 | 46,200,000 |  |  |
Y & C Engine Co., Ltd. [member] |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Cash and cash equivalents | 63,381,000 | 64,252,000 |  |  |  |
Y & C Engine Co., Ltd. [member] | Outstanding bills receivables discounted with banks [Member] |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Share of outstanding bills receivables | 18,100,000 | 11,800,000 | 2,500,000 |  |  |
Y & C Engine Co., Ltd. [member] | Outstanding bills receivables endorsed to suppliers [Member] |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Share of outstanding bills receivables | 4,200,000 | 8,800,000 | 600,000 |  |  |
Joint ventures [member] |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Cash and cash equivalents | 714,365,000 |  | 99,580,000 |  |  |
Share of restricted cash | 22,500,000 | 22,300,000 | 3,100,000 |  |  |
Bills receivables | ¥ 0 | ¥ 2,300,000 | $ 0 |  |  |

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