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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 |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2018 CNY (¥)
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Non-current assets | ¥ 7,115,626 |  | ¥ 7,029,973 |  | $ 1,125,497 |  |
Cash and bank balances | 4,788,219 |  | 5,877,647 | ¥ 5,753,268 | 757,366 | $ 929,684 | ¥ 5,559,890
Others | 16,773 |  | 23,164 |  | 2,653 |  |
Total assets | 25,100,686 |  | 26,290,958 | 23,854,191 | 3,970,244 |  |
Non-current liabilities | (848,506) |  | (1,406,453) |  | (134,209) |  |
Total liabilities | (13,485,342) |  | (14,458,248) | (12,280,806) | (2,133,012) |  |
Equity | 11,615,344 |  | 11,832,710 | 11,573,385 | 1,837,232 |  | ¥ 11,147,554
Investment in joint ventures | 151,095 |  | 227,120 | 273,991 | 23,899 |  |
Revenue | 21,265,930 | $ 3,363,691 | 20,581,170 | 18,016,085 |  |  |
Depreciation and amortization | (573,596) | (90,728) | (494,607) | (465,209) |  |  |
Interest expense | (111,792) | (17,683) | (147,293) | (126,851) |  |  |
Profit/(loss) for the year, representing total comprehensive income for the year | 435,099 | 68,821 | 712,710 | 872,217 |  |  |
Group's share of profit of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | (95,985) | $ (15,182) | (59,422) | ¥ 19,215 |  |  |
Y & C Engine Co., Ltd. [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Non-current assets | 660,856 |  | 740,423 |  |  |  |
Cash and bank balances | 179,779 |  | 160,844 |  |  |  |
Others | 817,972 |  | 1,287,935 |  |  |  |
Total assets | 1,658,607 |  | 2,189,202 |  |  |  |
Non-current liabilities | (362,779) |  | (417,759) |  |  |  |
Others | (1,147,416) |  | (1,340,704) |  |  |  |
Total liabilities | (1,510,195) |  | (1,758,463) |  |  |  |
Equity | ¥ 148,412 |  | ¥ 430,739 |  |  |  |
Proportion of the Group's ownership | 45.00% | 45.00% | 45.00% | 45.00% |  |  |
Group's share of net assets | ¥ 66,785 |  | ¥ 193,833 |  |  |  |
Unrealized profit on transactions with joint venture | (43,964) |  | (48,234) |  |  |  |
Investment in joint ventures | 22,821 |  | 145,599 |  | 3,610 |  |
Revenue | 2,072,721 |  | 3,021,877 | ¥ 2,404,244 |  |  |
Depreciation and amortization | (52,881) |  | (59,406) | (26,099) |  |  |
Interest expense | (51,836) |  | (40,709) | (29,606) |  |  |
Profit/(loss) for the year, representing total comprehensive income for the year | ¥ (282,205) |  | ¥ (88,785) | ¥ 44,484 |  |  |
Proportion of the Group's ownership | 45.00% | 45.00% | 45.00% | 45.00% |  |  |
Group's share of profit/(loss) | ¥ (126,992) |  | ¥ (39,953) | ¥ 20,018 |  |  |
Unrealized profit on transactions with joint venture | 1,139 |  | (4,063) | 8,466 |  |  |
Group's share of profit of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | (125,853) | $ (19,907) | (44,016) | 28,484 |  |  |
Y & C Engine Co., Ltd. [member] | Significant Joint Ventures [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investment in joint ventures | 22,821 |  | 145,599 |  |  |  |
Group's share of profit of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | (125,853) |  | (44,016) | 28,484 |  |  |
Joint ventures [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Non-current assets | 822,463 |  | 857,641 |  | 130,091 |  |
Cash and bank balances | 245,493 |  | 206,173 |  | 38,830 |  |
Others | 1,227,718 |  | 1,597,953 |  | 194,192 |  |
Total assets | 2,295,674 |  | 2,661,767 |  | 363,113 |  |
Non-current liabilities | (376,888) |  | (417,759) |  | (59,613) |  |
Others | (1,513,541) |  | (1,651,627) |  | (239,401) |  |
Total liabilities | (1,890,429) |  | (2,069,386) |  | (299,014) |  |
Equity | 405,245 |  | 592,381 |  | 64,099 |  |
Investment in joint ventures | 151,095 |  | 227,120 |  | 23,899 |  |
Revenue | 2,697,837 | 426,724 | 3,375,542 | 2,586,549 |  |  |
Depreciation and amortization | (55,967) | (8,852) | (62,116) | (32,503) |  |  |
Interest expense | (53,727) | (8,498) | (42,692) | (34,623) |  |  |
Profit/(loss) for the year, representing total comprehensive income for the year | (224,868) | (35,568) | (121,459) | 25,970 |  |  |
Group's share of profit of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | (95,985) | (15,182) | (59,422) | 19,215 |  |  |
Joint ventures [member] | Significant Joint Ventures [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investment in joint ventures | 143,957 |  | 220,454 |  | 22,770 |  |
Group's share of profit of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | (96,439) | (15,254) | (59,935) | 19,712 |  |  |
Joint ventures [member] | Other Joint Ventures [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investment in joint ventures | 7,138 |  | 6,666 |  | 1,129 |  |
Group's share of profit of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | 454 | $ 72 | 513 | ¥ (497) |  |  |
MTU Yuchai Power Co., Ltd [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Non-current assets | 89,749 |  | 71,635 |  |  |  |
Cash and bank balances | 63,609 |  | 43,056 |  |  |  |
Others | 310,394 |  | 266,123 |  |  |  |
Total assets | 463,752 |  | 380,814 |  |  |  |
Non-current liabilities | 0 |  |  |  |  |  |
Others | (271,521) |  | (244,963) |  |  |  |
Total liabilities | (271,521) |  | (244,963) |  |  |  |
Equity | ¥ 192,231 |  | ¥ 135,851 |  |  |  |
Proportion of the Group's ownership | 50.00% | 50.00% | 50.00% | 50.00% |  |  |
Group's share of net assets | ¥ 96,116 |  | ¥ 67,926 |  |  |  |
Unrealized profit on transactions with joint venture | (6,635) |  | (5,709) |  |  |  |
Investment in joint ventures | 89,481 |  | 62,217 |  | $ 14,153 |  |
Revenue | 467,800 |  | 307,699 | ¥ 178,796 |  |  |
Depreciation and amortization | (2,377) |  | (2,350) | (6,379) |  |  |
Interest expense | (1,850) |  | (1,983) | (5,017) |  |  |
Profit/(loss) for the year, representing total comprehensive income for the year | ¥ 54,526 |  | ¥ 6,421 | ¥ 600 |  |  |
Proportion of the Group's ownership | 50.00% | 50.00% | 50.00% | 50.00% |  |  |
Group's share of profit/(loss) | ¥ 27,263 |  | ¥ 3,211 | ¥ 300 |  |  |
Unrealized profit on transactions with joint venture | 774 |  | 27 | 294 |  |  |
Group's share of profit of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | 28,037 | $ 4,435 | 3,238 | 594 |  |  |
MTU Yuchai Power Co., Ltd [member] | Significant Joint Ventures [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investment in joint ventures | 89,481 |  | 62,217 |  |  |  |
Group's share of profit of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | 28,037 |  | 3,238 | ¥ 594 |  |  |
Eberspaecher Yuchai [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Non-current assets | 71,858 |  | 45,583 |  |  |  |
Cash and bank balances | 2,105 |  | 2,273 |  |  |  |
Others | 99,352 |  | 43,895 |  |  |  |
Total assets | 173,315 |  | 91,751 |  |  |  |
Non-current liabilities | (14,109) |  |  |  |  |  |
Others | (94,604) |  | (65,960) |  |  |  |
Total liabilities | (108,713) |  | (65,960) |  |  |  |
Equity | ¥ 64,602 |  | ¥ 25,791 |  |  |  |
Proportion of the Group's ownership | 49.00% | 49.00% | 49.00% | 49.00% |  |  |
Group's share of net assets | ¥ 31,655 |  | ¥ 12,638 |  |  |  |
Unrealized profit on transactions with joint venture | 0 |  |  |  |  |  |
Revenue | 157,316 |  | 45,966 | ¥ 3,509 |  |  |
Depreciation and amortization | (709) |  | (360) | (25) |  |  |
Interest expense | (41) |  |  |  |  |  |
Profit/(loss) for the year, representing total comprehensive income for the year | ¥ 2,811 |  | ¥ (39,095) | ¥ (19,114) |  |  |
Proportion of the Group's ownership | 49.00% | 49.00% | 49.00% | 49.00% |  |  |
Group's share of profit/(loss) | ¥ 1,377 |  | ¥ (19,157) | ¥ (9,366) |  |  |
Eberspaecher Yuchai [member] | Significant Joint Ventures [member] |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investment in joint ventures | 31,655 |  | 12,638 |  |  |  |
Group's share of profit of other joint ventures, representing the Group's share of total comprehensive income loss of other joint ventures | ¥ 1,377 |  | ¥ (19,157) | ¥ (9,366) |  |  |

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