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Investments in Subsidiaries - Details of Significant Subsidiaries of the Group (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Guangxi Yuchai Machinery Company Limited [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Place of incorporation | People's Republic of China |
Place of business | People's Republic of China |
Group's effective equity interest | 76.40% | 76.40%
Guangxi Yuchai Machinery Monopoly Development Company Limited [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Place of incorporation | People's Republic of China |
Place of business | People's Republic of China |
Group's effective equity interest | 54.90% | 54.90%
Guangxi Yuchai Accessories Manufacturing Company Limited [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Place of incorporation | People's Republic of China |
Place of business | People's Republic of China |
Group's effective equity interest | 76.40% | 76.40%
Guangxi Yuchai Equipment Mould Company Limited [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Place of incorporation | People's Republic of China |
Place of business | People's Republic of China |
Group's effective equity interest | 76.40% | 76.40%
Guangxi Yulin Hotel Company Limited [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Place of incorporation | People's Republic of China |
Place of business | People's Republic of China |
Group's effective equity interest | 76.40% | 76.40%
Jining Yuchai Engine Company Limited [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Place of incorporation | People's Republic of China |
Place of business | People's Republic of China |
Group's effective equity interest | 76.40% |
Yuchai Remanufacturing Services Suzhou Co Ltd [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Place of incorporation | People's Republic of China |
Place of business | People's Republic of China |
Group's effective equity interest | 76.40% | 76.40%
HL Global Enterprises Limited [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Place of incorporation | Singapore |
Place of business | Singapore |
Group's effective equity interest | 50.20% | 50.20%

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- Definition The principal place of business of a subsidiary. [Refer: Principal place of business; Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2016-01-13 -Paragraph 16 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2016-03-30&anchor=para_16_b_ii&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2016-01-13 -Paragraph 17 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2016-03-30&anchor=para_17_b_ii&doctype=Standard -URIDate 2016-03-31 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2016-01-13 -Paragraph 12 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2016-03-30&anchor=para_12_b&doctype=Standard -URIDate 2016-03-31 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2016-01-13 -Paragraph 19B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2016-03-30&anchor=para_19B_b&doctype=Standard -URIDate 2016-03-31 + Details
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