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Investments in Subsidiaries - Additional Information (Detail) ¥ in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 22, 2017 CNY (¥) | Nov. 22, 2017 USD ($) | Nov. 30, 2017 CNY (¥) | Oct. 31, 2017 CNY (¥) | Jun. 30, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Nov. 30, 2016 | Sep. 30, 2016 CNY (¥) | Oct. 31, 2015 CNY (¥) | Jul. 31, 2015 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 USD ($)
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents subject to local exchange control regulations |  |  |  |  |  | ¥ 3,270,182 |  |  |  |  | ¥ 4,710,158 |  | ¥ 3,270,182 |  | $ 744,171
Goodwill arising from acquisition written off |  |  |  |  |  |  |  |  |  |  |  |  | 1,131 |  |
Additional investment in subsidiaries |  |  |  |  |  |  |  |  |  |  | ¥ 8,279 | $ 1,308 | ¥ 9,076 | ¥ 22,499 |
Yuchai [Member] | Guangxi Yuchai Equipment Mould Company Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of additional equity interests acquired |  |  |  |  |  |  |  |  | 2.86% |  |  |  |  |  |
Purchase consideration |  |  |  |  |  |  |  |  | ¥ 4,200 |  |  |  |  |  |
Guangxi Yuchai Machinery Monopoly Development Company Limited [Member] | Yunnan Yuchai Machinery Industry Company Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of equity interest |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |
Offsetting trade receivables |  |  |  |  |  |  |  |  |  | ¥ 18,300 |  |  |  |  |
Guangxi Yuchai Machinery Monopoly Development Company Limited [Member] | Sichuan Yuchai Machinery Industry Company Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of equity interest |  |  |  |  |  |  |  | 47.53% |  |  |  |  |  |  |
Additional investment in subsidiaries |  |  |  |  |  |  |  | ¥ 8,900 |  |  |  |  |  |  |
Guangxi Yuchai Machinery Monopoly Development Company Limited [Member] | Hunan Yuchai Machinery Industry Company Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of equity interest |  |  |  | 49.00% |  |  |  |  |  |  |  |  |  |  |
Additional investment in subsidiaries |  |  |  | ¥ 6,700 |  |  |  |  |  |  |  |  |  |  |
Guangxi Yuchai Accessories Manufacturing Company Limited [Member] | Guangxi Yuchai Crankshaft Company Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of equity interest |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Additional investment in subsidiaries |  |  |  |  | ¥ 1,300 |  |  |  |  |  |  |  |  |  |
Jining Yuchai Engine Company Limited [Member] | Yuchai [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of equity interest |  |  | 100.00% |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Additional investment in subsidiaries |  |  | ¥ 250 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership control prior to acquisition |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
YC Europe Co. Limited [Member] | Yuchai [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of additional equity interests acquired |  |  |  |  |  | 32.50% |  |  |  |  |  |  | 32.50% |  |
Percentage of ownership interest in joint venture |  |  |  |  |  | 67.50% | 35.00% |  |  |  |  |  |  |  |
HL Global Enterprises Limited [Member] | LKN Investment International Pte. Ltd and Shanghai Hutai Real Estate Development Co. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration, disposal | ¥ 395,000 | $ 62,400 |  |  |  |  |  |  |  |  |  |  |  |  |

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