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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

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The amount of dividends paid to non-controlling interests. [Refer: Non-controlling interests]

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- Definition

The amount of equity in a subsidiary not attributable, directly or indirectly, to a parent. [Refer: Subsidiaries [member]]

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The profit (loss) attributable to non-controlling interests. [Refer: Profit (loss); Non-controlling interests]

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The proportion of ownership interests in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests]

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