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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 |
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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 The amount of dividends paid to non-controlling interests. [Refer: Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2016-01-13 -Paragraph B10 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2016-03-30&anchor=para_B10_a&doctype=Appendix&seq=2 -URIDate 2016-03-31 + Details
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- Definition The amount of equity in a subsidiary not attributable, directly or indirectly, to a parent. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2016-01-13 -Paragraph 12 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2016-03-30&anchor=para_12_f&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 54 -Subparagraph q -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_54_q&doctype=Standard -URIDate 2016-03-31 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 10 -IssueDate 2016-01-13 -Paragraph 22 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=10&date=2016-03-30&anchor=para_22&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The profit (loss) attributable to non-controlling interests. [Refer: Profit (loss); Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2016-01-13 -Paragraph 12 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2016-03-30&anchor=para_12_e&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 81B -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_81B_a_i&doctype=Standard -URIDate 2016-03-31 + Details
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