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Investment in Joint Ventures - Summarized Financial Information of Joint Ventures and Reconciliation with Carrying Amount of Investment in Consolidated Financial Statements (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |  |
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Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2021 CNY (¥)
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Non-current assets | ¥ 6,526,863 |  | ¥ 6,593,763 |  | $ 909,821 |  |
Cash and bank balances | 5,915,916 |  | 5,544,376 | ¥ 4,451,489 | 824,656 | $ 772,865 | ¥ 4,788,219
Total assets | 27,048,094 |  | 25,757,618 | 24,137,556 | 3,770,401 |  |
Non-current liabilities | (1,518,024) |  | (1,523,411) |  | (211,607) |  |
Total liabilities | (14,748,529) |  | (13,581,993) | (12,302,492) | (2,055,888) |  |
Investment in joint ventures | 338,579 |  | 237,229 | 154,703 | 47,197 |  |
Revenue | 19,133,575 | $ 2,667,146 | 18,046,349 | 16,030,636 |  |  |
Depreciation and amortization | (714,830) | (99,644) | (665,065) | (624,692) |  |  |
Profit/(loss) for the year, representing total comprehensive income for the year | 510,201 | 71,120 | 454,874 | 424,778 |  |  |
Group's share of results of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | 101,553 | $ 14,156 | 62,083 | ¥ (27,546) |  |  |
Y & C Engine Co., Ltd. [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Non-current assets | 615,724 |  | 685,434 |  |  |  |
Cash and bank balances | 63,381 |  | 64,252 |  |  |  |
Others | 443,449 |  | 426,105 |  |  |  |
Total assets | 1,122,554 |  | 1,175,791 |  |  |  |
Non-current liabilities | (185,872) |  | (146,218) |  |  |  |
Current liabilities | (840,925) |  | (946,348) |  |  |  |
Total liabilities | ¥ (1,026,797) |  | ¥ (1,092,566) |  |  |  |
Proportion of the Group's ownership | 45.00% | 45.00% | 45.00% | 45.00% |  |  |
Group's share of net assets | ¥ 43,091 |  | ¥ 37,451 |  |  |  |
Unrealized profit on transactions with joint venture | (8,219) |  | (24,474) |  |  |  |
Investment in joint ventures | 34,872 |  | 12,977 |  | 4,861 |  |
Revenue | 1,492,662 |  | 1,562,179 | ¥ 1,255,967 |  |  |
Depreciation and amortization | (73,861) |  | (63,648) | (29,617) |  |  |
Interest (expense)/income, net | (20,545) |  | (22,508) | (30,547) |  |  |
Profit/(loss) for the year, representing total comprehensive income for the year | 12,587 |  | (6) | (65,961) |  |  |
Group's share of results | 5,664 |  | (3) | (29,682) |  |  |
Unrealized profit on transactions with joint venture | 10,016 |  | (4,016) | (24,434) |  |  |
Group's share of results of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | 15,680 | $ 2,186 | (4,019) | (54,116) |  |  |
Net assets/(liabilities) | 95,757 |  | 83,225 |  |  |  |
Y & C Engine Co., Ltd. [member] | Significant Joint Ventures [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investment in joint ventures | 34,872 |  | 12,977 |  |  |  |
Group's share of results of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | 15,680 |  | (4,019) | ¥ (54,116) |  |  |
MTU Yuchai Power Co., Ltd [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Non-current assets | 80,622 |  | 74,794 |  |  |  |
Cash and bank balances | 610,900 |  | 523,858 |  |  |  |
Others | 253,523 |  | 226,881 |  |  |  |
Total assets | 945,045 |  | 825,533 |  |  |  |
Non-current liabilities | (5,101) |  | (4,825) |  |  |  |
Current liabilities | (360,026) |  | (414,396) |  |  |  |
Total liabilities | ¥ (365,127) |  | ¥ (419,221) |  |  |  |
Proportion of the Group's ownership | 50.00% | 50.00% | 50.00% | 50.00% |  |  |
Group's share of net assets | ¥ 289,959 |  | ¥ 203,156 |  |  |  |
Unrealized profit on transactions with joint venture | (3,118) |  |  |  |  |  |
Investment in joint ventures | 286,841 |  | 203,156 |  | 39,985 |  |
Revenue | 973,322 |  | 708,432 | ¥ 594,197 |  |  |
Depreciation and amortization | (9,471) |  | (8,682) | (9,733) |  |  |
Interest (expense)/income, net | 10,570 |  | 6,762 | 470 |  |  |
Profit/(loss) for the year, representing total comprehensive income for the year | 173,606 |  | 150,030 | 66,076 |  |  |
Group's share of results | 86,803 |  | 75,015 | 33,038 |  |  |
Unrealized profit on transactions with joint venture | (299) |  | (288) | 7,241 |  |  |
Group's share of results of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | 86,504 | $ 12,058 | 74,727 | 40,279 |  |  |
Net assets/(liabilities) | 579,918 |  | 406,312 |  |  |  |
MTU Yuchai Power Co., Ltd [member] | Significant Joint Ventures [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investment in joint ventures | 286,841 |  | 203,156 |  |  |  |
Group's share of results of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | 86,504 |  | 74,727 | 40,279 |  |  |
Guangxi Purem Yuchai Automotive Technology Co., Ltd [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Non-current assets |  |  | 51,877 |  |  |  |
Cash and bank balances |  |  | 16,171 |  |  |  |
Others |  |  | 45,009 |  |  |  |
Total assets |  |  | 113,057 |  |  |  |
Current liabilities |  |  | (80,672) |  |  |  |
Total liabilities |  |  | ¥ (80,672) |  |  |  |
Proportion of the Group's ownership |  |  | 49.00% |  |  |  |
Group's share of net assets |  |  | ¥ 15,869 |  |  |  |
Investment in joint ventures | 16,856 |  | 15,869 |  | 2,350 |  |
Group's share of results of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | 987 | $ 138 | (4,508) | ¥ (11,278) |  |  |
Net assets/(liabilities) |  |  | 32,385 |  |  |  |
Guangxi Purem Yuchai Automotive Technology Co., Ltd [member] | Significant Joint Ventures [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investment in joint ventures |  |  | ¥ 15,869 |  |  |  |
Purem [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Non-current assets | 42,707 |  |  |  |  |  |
Cash and bank balances | 40,084 |  |  |  |  |  |
Others | 29,891 |  |  |  |  |  |
Total assets | 112,682 |  |  |  |  |  |
Current liabilities | (78,282) |  |  |  |  |  |
Total liabilities | ¥ (78,282) |  |  |  |  |  |
Proportion of the Group's ownership | 49.00% | 49.00% | 49.00% | 49.00% |  |  |
Group's share of net assets | ¥ 16,856 |  |  |  |  |  |
Revenue | 78,569 |  | ¥ 79,119 | ¥ 69,380 |  |  |
Depreciation and amortization | (7,198) |  | (7,557) | (7,726) |  |  |
Interest (expense)/income, net | 47 |  | 36 | (469) |  |  |
Profit/(loss) for the year, representing total comprehensive income for the year | 2,014 |  | (9,201) | (23,016) |  |  |
Group's share of results | 987 |  | (4,508) | (11,278) |  |  |
Net assets/(liabilities) | 34,400 |  |  |  |  |  |
Purem [member] | Significant Joint Ventures [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investment in joint ventures | 16,856 |  |  |  |  |  |
Group's share of results of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | 987 |  | (4,508) | (11,278) |  |  |
Total for Significant Joint Ventures [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Non-current assets |  |  | 812,105 |  |  |  |
Cash and bank balances |  |  | 604,281 |  |  |  |
Others |  |  | 697,995 |  |  |  |
Total assets |  |  | 2,114,381 |  |  |  |
Non-current liabilities |  |  | (151,043) |  |  |  |
Current liabilities |  |  | (1,441,416) |  |  |  |
Total liabilities |  |  | (1,592,459) |  |  |  |
Investment in joint ventures |  |  | 237,229 |  |  |  |
Net assets/(liabilities) |  |  | 521,922 |  |  |  |
Total for Significant Joint Ventures [Member] | Significant Joint Ventures [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investment in joint ventures |  |  | 232,002 |  |  |  |
Total for Significant Joint Ventures [Member] | Other Joint Ventures [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investment in joint ventures |  |  | 5,227 |  |  |  |
Joint ventures [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Non-current assets | 739,053 |  |  |  | 103,021 |  |
Cash and bank balances | 714,365 |  |  |  | 99,580 |  |
Others | 726,863 |  |  |  | 101,322 |  |
Total assets | 2,180,281 |  |  |  | 303,923 |  |
Non-current liabilities | (190,973) |  |  |  | (26,621) |  |
Current liabilities | (1,279,233) |  |  |  | (178,320) |  |
Total liabilities | (1,470,206) |  |  |  | (204,941) |  |
Investment in joint ventures | 338,579 |  |  |  | 47,197 |  |
Revenue | 2,544,553 | $ 354,701 | 2,349,730 | 1,919,544 |  |  |
Depreciation and amortization | (90,530) | (12,620) | (79,887) | (47,076) |  |  |
Interest (expense)/income, net | (9,928) | (1,384) | (15,710) | (30,546) |  |  |
Profit/(loss) for the year, representing total comprehensive income for the year | 188,207 | 26,235 | 140,823 | (22,901) |  |  |
Group's share of results of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | 101,553 | 14,156 | 62,083 | (27,546) |  |  |
Net assets/(liabilities) | 710,075 |  |  |  | 98,982 |  |
Joint ventures [member] | Significant Joint Ventures [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investment in joint ventures | 338,569 |  |  |  | 47,196 |  |
Group's share of results of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | 103,171 | 14,382 | 66,200 | (25,115) |  |  |
Joint ventures [member] | Other Joint Ventures [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investment in joint ventures | 10 |  |  |  | $ 1 |  |
Group's share of results of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | ¥ (1,618) | $ (226) | ¥ (4,117) | ¥ (2,431) |  |  |

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