Investments in Subsidiaries - Subsidiary having Non-controlling Interests that are Material to the Group (Detail) ¥ in Thousands, $ in Thousands |
12 Months Ended | ||||
|---|---|---|---|---|---|
|
Dec. 31, 2017
CNY (¥)
|
Dec. 31, 2017
USD ($)
|
Dec. 31, 2016
CNY (¥)
|
Dec. 31, 2015
CNY (¥)
|
Dec. 31, 2017
USD ($)
|
|
| Disclosure of subsidiaries [Line Items] | |||||
| Accumulated balances of material NCI | ¥ 2,631,714 | ¥ 2,301,978 | $ 415,792 | ||
| Profit allocated to material NCI | ¥ 451,148 | $ 71,278 | ¥ 207,871 | ¥ 168,212 | |
| Guangxi Yuchai Machinery Company Limited [Member] | |||||
| Disclosure of subsidiaries [Line Items] | |||||
| Proportion of equity interest held by NCI | 23.60% | 23.60% | 23.60% | 23.60% | |
| Accumulated balances of material NCI | ¥ 2,437,215 | ¥ 2,253,207 | $ 385,063 | ||
| Profit allocated to material NCI | 290,497 | $ 45,896 | 210,013 | ¥ 129,088 | |
| Dividends paid to material NCI | ¥ 98,941 | $ 15,632 | ¥ 83,677 | ¥ 100,412 | |